19 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 13:19
  Possible to copy PCR/PTS/DTS data between TS files? - muraliv Newest 'ffmpeg' Questions - Stack Overflow
  I've 2 h264/aac stream TS files (say a.ts and b.ts) that have same duration and packet numbers. However PCR/PTS/DTS data of their audio/video stream packets are different. How do I copy PCR/PTS/DTS data from a.ts to b.ts using ffmpeg or other tools without actually overwriting the audio and video frames data? Ideally want to do this without re-encoding.
• 11:03
  ffmpeg saving rtsp to mp4 file but video have a lot of green and gray block [closed] - UncleKing Newest 'ffmpeg' Questions - Stack Overflow
  I use ffmpeg to save IPcam rtsp to mp4 , but the video have half green or gray , here is the paramter : ffmpeg -i "rtsp://192.168.0.37/live/1" -s 1920x1080 -filter:v "fps=fps=15,drawtext=text='test':fontcolor=red:fontsize=32:x=(w-text_w)/2:y=(h-text_h)/2" -crf 36 -preset ultrafast -vcodec libx264 -an -t 10 -f mp4 tmp.mp4 and here is the strange video I need to know what's wrong ? my ipcam setting is: H264 , 2560*1440 , 20fps , fixed rate 4096Kbps , Iframe 2 seconds , (...) --
• 11:18
  Flutter error in Ffmpeg, "Unhandled Exception: ProcessException: No such file or directory" in macOS desktop version - pratik vekariya Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying video trim video using ffmpeg, for macOS desktop application. I have downloaded ffmpeg from here for macOS. Here is my code String mainPath = 'Users/apple/Workspace/User/2024/Project/videoapp/build/macos/Build/Products/Debug/'; mainPath = mainPath.substring(0, mainPath.lastIndexOf("/")); Directory directoryExe3 = Directory("$mainPath"); var dbPath = path.join(directoryExe3.path, "App.framework/Resources/flutter_assets/assets/ffmpeg/ffmpegmacos"); //here in "Products/Debug/" folder desktop app will (...) -- here
• 10:28
  How to make only words (not sentences) in SRT file by AssemblyAI - flip Newest 'ffmpeg' Questions - Stack Overflow
  Okay... So Im trying to create a video making program thing and I'm basically finished but I wanted to change 1 key thing and don't know how to... Here's the code: import assemblyai as aai import colorama from colorama import * import time import os aai.settings.api_key = "(cant share)" print('') print('') print(Fore.GREEN + 'Process 3: Creating subtitles...') print('') time.sleep(1) print(Fore.YELLOW + '>> Creating subtitles...') transcript = aai. (...)
• 09:27
  FFMPEG merge multiple audio into video in specific time - Umar Newest 'ffmpeg' Questions - Stack Overflow
  Right now i have: 1 - video (.mp4) N - audio with its timestamp start and end (.wav) I want to merge those audio to the video based on that time with still preserving the original video audio So that the final illustration will looks like this: audio ----aud1------aud2------aud3--------aud4---------audn-------> video+audio ------------------------------------------------------------> the audio position will be based on the time, i already have this data start=00:00:12.040,end=00:00:16.640 aud1 start=00:00:16.640,end=00:00:21.520 (...)
• 09:19
  ffmpeg: convert subtitles from "hdmv_pgs_subtitle" to "mov_text" (needed in MP4) - rgr Newest 'ffmpeg' Questions - Stack Overflow
  Is there any way to convert subtitles from "hdmv_pgs_subtitle" to "mov_text" (needed in MP4). I try: ffmpeg.exe i "%%F" c copy -scodec mov_text "test.mp4" but I get: Error while opening encoder for output stream #0:2 - maybe incorrect parameters such as bit_rate, rate, width or height Stream properties: Duration: 00:01:48.14, start: 4199.920000, bitrate: 12394 kb/s Program 1 Stream #0:0[0x1011], 169, 1/90000: Video: h264 (High), 1 reference frame (HDMV / 0x564D4448), yuv420p(top first, left), 1920x1080 (1920x1088) [SAR (...)
• 04:54
  ffmpeg timelapse resets PTS on frame size change - Ral Newest 'ffmpeg' Questions - Stack Overflow
  I have 601 sequential images, they change size and aspect ratio on frame 36 and 485, creating 3 distinct sizes of images in the set. I want to create a timelapse and shave off the first 200 frames and only show the remaining 401, but if I do a trim filter on the input, the filter treats each of the 3 sections of different sized frames as separate 'streams' with their own reset PTS, all of which start at the exact same time. This means the final output of the below commmand is only 249 frames long instead of 401. How can I fix this so I just get the final 401 (...)

18 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 18:58
  How to create an encoding ladder for any aspect ratio? - volume one Newest 'ffmpeg' Questions - Stack Overflow
  For a given video uploaded by a user, I need to create three versions of it to cover standard definition (SD), high definition (HD), full high definition (FHD), and ultra high definition (UHD e.g. 4K). "resolution/encoding ladders" for standard aspect ratios like 16:9 and 4:3. For 4:3 we might have: 640 x 480 960 x 720 1440 x 1080 2880 x 2160 For 16:9 we might have: 854 x 480 1280 x 720 1920 x 1080 3840 x 2160 If a user uploads a file in either of those aspect ratios, we can create the four different versions because the resolution (...)
• 18:15
  ffmpeg: `ffmpeg -i "/video.mp4" -i "/audio.m4a" -c copy -map 0:v:0 -map 1:a:0 -shortest "/nu.mp4"` truncates, how to loop audio to match videos? [closed] - Swudu Susuwu Newest 'ffmpeg' Questions - Stack Overflow
  This is with "FFmpeg Media Encoder" from Google Store (Linux-based Android OS), but it has all the commands of ffmpeg for normal Linux. shortest truncates the video to match the audio, and -longest has the last half of the video not have audio (for videos twice as long as audio,) what to use to loop audio (to match length of video with this)? Video length is 15:02, so used ffmpeg -i "/audio.m4a" -c copy -map 0:a:0 "/audionew.m4a"-t 15:02 -stream_loop -1`, but got (...)
• 17:55
  Replacing avcodec_decode_video/avcodec_decode_video2 with currently supported functions - Silverstock Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to build a C++ program, and the creator is using depreciated functions, I have been replacing them fairly easily, but I am not totally sure how to replace these. This is a sample from the decode file: #if defined HAVE_AVCODEC_SEND_PACKET && defined HAVE_AVCODEC_RECEIVE_FRAME AVPacket* pkt = av_packet_alloc(); if (!pkt) return 0; pkt->data=data; pkt->size=datalen; int ret = avcodec_send_packet(codecContext, pkt); while (ret == 0) ret = avcodec_receive_frame(codecContext,frameIn); if (ret != 0)  (...)
• 17:46
  Splitting my code into OpenCV and UDP and the differences between using OpenCV and UDP - Sagiv Shaniv Newest 'ffmpeg' Questions - Stack Overflow
  1) I wrote a Python code to receive video in real-time, compress it, duplicate the video, and then send it to OpenCV and UDP using ffmpeg. I would like to know how I can duplicate the code to send it to both UDP and OpenCV (without sending it to another device) without affecting the frame rate. This is the code I used so far: import subprocess import cv2 # Start ffmpeg process to capture video from USB, encode it in H.264, and send it over UDP and to virtual video device ffmpeg_cmd = [ 'ffmpeg', '-f', 'v4l2', # Input format (...)
• 14:23
  Why is FFProbe (using fluent-ffmpeg) returning incomplete and inaccurate metadata? - volume one Newest 'ffmpeg' Questions - Stack Overflow
  I am returning metadata about a file using ffprobe. The file can be found here. I am using fluent-ffmpeg in Node.js which shouldn't make any difference. Its just nicer to use than a command-line. The code goes like this: ffmpeg.ffprobe('https://devxxx001.s3.amazonaws.com/vertical-hd_720_1280_30fps.mp4'), function (err, metadata) console.log(JSON.stringify(metadata)); ); The metadata output I receive is this: "streams": [ "index": 0, "codec_name": "h264", "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 (...) -- found here
• 10:02
  How to use the latest version of ⓐffmpeg/ffmpeg in a React.js project? - Muzammil Raza Newest 'ffmpeg' Questions - Stack Overflow
  I'm working on a React.js project where I need to process videos in the browser using ⓐffmpeg/ffmpeg. I noticed that the package has been updated recently, and the API and functions have changed. In the older version, I used to import the package and functions like this: import createFFmpeg, fetchFile from 'ⓐffmpeg/ffmpeg'; However, in the latest version, I see that the import has changed to: import FFmpeg from 'ⓐffmpeg/ffmpeg'; and all new functions are changed I have checked in by log: I have check by console ffmpeg, it (...)
• 07:49
  FFmpeg - record from stream terminating unexpectedly using kokorin/Jaffree ffmpeg wrapper for Java - pyrmon Newest 'ffmpeg' Questions - Stack Overflow
  I am programming a Spring Boot Application using Maven and Java 21. I am trying to record a stream from a url and save it to a mkv file. I intend to do this with kokorin/Jaffree in version 2023.09.10. The recording seems to work ok, however longer videos are terminating unexpectedly. Sometimes after 5 minutes, other times an hour or even longer. Sometimes with Exit Code 0 and sometimes with 1. I have implemented the recording like this: ⓐOverride public void startRecording(RecordingSchedule recordingSchedule) logger.info("Starting recording for schedule with filename (...)

17 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 22:58
  JPG Right Colors [closed] - user1897354 Newest 'ffmpeg' Questions - Stack Overflow
  For this type of video, do I get the right colors for jpgs? Color space : YUV Chroma subsampling : 4:4:4 Color range : Limited Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 For the video, I tried making jpegs using this code, but the colors did not match: ffmpeg -i input.mkv -vf zscale=min=709:m=170m:rin=limited:r=full,format=yuv444p -qmin 1 -qmax 1 -q:v 1 output%03d.jpg
• 21:15
  Split mp4 in chunks and stream to the browser? - Paul Newest 'ffmpeg' Questions - Stack Overflow
  I have a regular mp4 file which I need to store into smaller chunks in separate locations, what's the proper way of splitting the file and then have the browser be able to play it by requesting chunks? I'm a bit confused about segments and fragments, can I do all of this with a single ffmpeg command? Something to split the file into 10s chunks and then still be able to stream it in the video tag by appending to the MediaStream buffer?
• 18:36
  Remove video noise from video with ffmpeg without producing blur / scale down effect - Sucahyo Aji Newest 'ffmpeg' Questions - Stack Overflow
  My videos are 1920x1080 recorded with high ISO (3200) using smartphone (to get bright view, backlight scene mode). It produce a lot of noise. I try many video filter but all of them produce blur similar to when we reduce the resolution in half then increase it back again. Is there a good video noise filter that only remove noise without producing blur? Because if it produce blur, I would prefer to not do any filtering at all. I have tried video filter: nlmeans=s=30:r=3:p=1 vaguedenoiser=threshold=22:percent=100:nsteps=4  (...) -- Part of the image
• 07:44
  ffmpeg video created from images looks faded [closed] - Oscar Franco Newest 'ffmpeg' Questions - Stack Overflow
  I'm creating a video from a series of png images I have generated. However, on the final video the colors look faded. Is there anyway to preserve the look of the images? Here is a sample image, it might be a little hard to tell due to compression but the hue of the green changes. Here are some of the commands I've used trying to get the colors to match: ffmpeg -framerate 60 -pattern_type glob -i 'capture/*.png' -c:v libx264 -preset slower -pix_fmt yuv420p -color_range tv -colorspace bt709 -color_primaries bt709 -color_trc iec61966-2-1 (...) -- ,
• 13:03
  OpenCV VideoWriter using ffmpeg with "Could not open codec 'libx264'" Error - user2262504 Newest 'ffmpeg' Questions - Stack Overflow
  I am new to OpenCV, and I want write Mat images into video using VideoWriter on Ubuntu 12.04. But when constructing VideoWriter, errors came out. It seems that OpenCV invoke ffmpeg API using default parameters and ffmpeg invoke x264 using its default parameters. Then these setting is broken for libx264. Thus the "Could not open codec 'libx264'" error. Anyone has ideas to solve this problem? More specifically: anyone knows where and how OpenCV invoke ffmpeg API? how to change ffmpeg default settings using code, hopefull, can be (...)
• 12:51
  ffmpeg is making my audio and video frozen and I don't know why - Sdpro Newest 'ffmpeg' Questions - Stack Overflow
  I'm using bunjs runtime to execute ffmpeg as terminal code but I don't know if my code is typescript code is wrong or ffmpeg is wrong and I'm using json file to get the clips correctly let videos = 0; let stepsTrim = ""; let concatInputs = ""; for (let i = 0; i < 40; i++) if (unwantedWords[i].keepORdelete === true) stepsTrim += `[0:v]trim=0:$ unwantedWords[i].start ,setpts=PTS[v$i];[0:a]atrim=0:$ unwantedWords[i].start ,asetpts=PTS-STARTPTS[a$i];[0:v]trim=$unwantedWords[i].start:$  (...)
• 11:27
  Python OpenCV VideoCapture Color Differs from ffmpeg and Other Media Players - cliffsu Newest 'ffmpeg' Questions - Stack Overflow
  I’m working on video processing in Python and have noticed a slight color difference when using cv2.VideoCapture to read videos compared to other media players. I then attempted to read the video frames directly using ffmpeg, and despite using the ffmpeg backend in OpenCV, there are still differences between OpenCV’s and ffmpeg’s output. The frames read by ffmpeg match those from other media players. Below are the videos I’m using for testing: test3.webm test.avi Here is my code: import cv2 import numpy as np import subprocess def (...) -- , , test3.webm, test.avi,
• 11:24
  Segmentation Fault when calling FFMPEG on Lambda - but not locally - thiagogps Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to extract the next 30 seconds of audio from a live video stream on YouTube using AWS Lambda. However, I'm facing an issue where Lambda does not wait for an FFmpeg subprocess to complete, unlike when running the same script locally. Below is a simplified Python script illustrating the problem: import subprocess from datetime import datetime def lambda_handler(event, context, streaming_url): ffmpeg_command = [ "ffmpeg", "-loglevel", "error", "-i", streaming_url, "-t", "30", "-acodec", "pcm_s16le", "-ar", "44100", (...)
• 11:12
  AWS Lambda Does Not Wait Until FFmpeg Subprocess Completes - thiagogps Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to extract the next 30 seconds of audio from a live video stream on YouTube using AWS Lambda. However, I'm facing an issue where Lambda does not wait for an FFmpeg subprocess to complete, unlike when running the same script locally. Below is a simplified Python script illustrating the problem: import subprocess from datetime import datetime def lambda_handler(event, context, streaming_url): ffmpeg_command = [ "ffmpeg", "-loglevel", "error", "-i", streaming_url, "-t", "30", "-acodec", "pcm_s16le", "-ar", "44100", (...)
• 10:53
  How to record video and audio from webcam using ffmpeg on Windows? - Babu Newest 'ffmpeg' Questions - Stack Overflow
  I want to record video as well as audio from webcam using ffmpeg, I have used the following codes to know what devices are available: ffmpeg -list_devices true -f dshow -i dummy And got the result: ffmpeg version N-54082-g96b33dd Copyright (c) 2000-2013 the FFmpeg developers built on Jun 17 2013 02:05:16 with gcc 4.7.3 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab le-iconv --enable-libass --enable-libbluray (...)
• 09:04
  How can we merge .cdg and .mp3 file in ffmpeg - Hemant Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to merge .cdg file and .mp3 file to make .mp4 file with help of ffmpeg. I am using following command: ffmpeg -i test.mp3 -i test.cdg -y test.MP4 MP4 file was created only with mp3 audio file. cdg file contain is missing
• 06:59
  FFmpeg player backporting to Android 2.1 - one more problem - tretdm Newest 'ffmpeg' Questions - Stack Overflow
  I looked for a lot of information about how to build and use FFmpeg in early versions of Android, looked at the source codes of players from 2011-2014 and was able to easily build FFmpeg 4.0.4 and 3.1.4 on the NDKv5 platform. I have highlighted the main things for this purpose: and before Android 2.2 (API Level 8) such a thing did not exist this requires some effort to implement buffer management for A/V streams, since in practice, when playing video, the application silently crashed after a few seconds due to overflow (below code example in C++ and (...) -- not officially included in Android 2.1 and above, my written build script
• 06:51
  FFmpeg C++ API : Using HW acceleration (VAAPI) to transcode video coming from a webcam - nicoh Newest 'ffmpeg' Questions - Stack Overflow
  I'm actually trying to use HW acceleration with the FFmpeg C++ API in order to transcode the video coming from a webcam (which may vary from one config to another) into a given output format (i.e: converting the video stream coming from the webcam in MJPEG to H264 so that it can be written into a MP4 file). I already succeeded to achieve this by transferring the AVFrame output by the HW decoder from GPU to CPU, then transfer this to the HW encoder input (so from CPU to GPU). This is not so optimized and on top of that, for the given above config (MJPEG => H264), I (...) -- https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_transcode.c
• 04:29
  When usg ffmpeg to convert from .mp4 to .avi, how do I get the .avi files to contain the correct (trimmed) frames from the .mp4? - cassenav Newest 'ffmpeg' Questions - Stack Overflow
  I am using ffmpeg to convert a batch of .mp4 videos to the .avi format from the command line. The .mp4 videos are all trimmed videos that are sub-videos of a longer video. I have basically segmented the longer video into small, non-overlapping chunks (or maybe with a couple milliseconds of overlap), and I want to convert all of these smaller chunks (.mp4) to .avi. However, I am running into an issue: the .avi files all contain a some additional frames at the beginning of each video which I explicitly trimmed in the .mp4 videos. I'm not sure what exactly is causing this problem or how (...)
• 00:59
  In mp4/h264, why does duplicate a frame need intensive re-encoding with ffmpeg? - kwjsksai Newest 'ffmpeg' Questions - Stack Overflow
  What I want to achieve is to duplicate all frames in 30fps.mp4 and result in a 60 fps video. I tried ffmpeg -i 30fps.mp4 -filter:v fps=60 out.mp4. It does what I want but with re-encoding. And the question is can it be done without re-encoding but only remux? The reason I'm asking is because intuitively speaking, we usually do shallow copy when same data is used multiple times. So can it be done? Does the codec/container even allow (...)

16 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 04:19
  AVFilterGraph cancel initiating [closed] - KaisoHHH Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use AVFilterGraph to filter render AVFrames from AVStream directly, but I'm facing a situation I might need to cancel the initiating since I may change the filter complex string frequently in a short time as the front end will change fast to adjust the filter complex string. And the init may take long because of my filter string includes some customized parts. I also thought about just async create other filter graph if I cannot just cancel the initiating process in avfilter_graph_parse_ptr. But I'm hesitant about memory leak it may cause. Wondering if (...)
• 19:41
  How can I convert a ffmpeg command to the ffmpeg-python script? - leo87 Newest 'ffmpeg' Questions - Stack Overflow
  I have a ffmpeg command for converting an audio file from .mpt to .aac and then combining it with a .mp4 video file to create a new video file, as shown below. I would like to convert these commands into a ffmpeg-python script. ffmpeg -i a.mp4 -vn -acodec copy a.aac ffmpeg -i v.mp4 -i a.aac -c:v copy -c:a copy -map 0:v:0 -map 1:a:0 output.mp4 Any suggestions on how to solve this problem please? Thanks in advance. I've managed to rewrite the first command in ffmpeg-python (it was easy) ( ffmpeg .input(a_input) .output('a.aac', (...)
• 20:43
  Modify the ffmpeg command to work with more than one image - Koi Farm ĐaMi Newest 'ffmpeg' Questions - Stack Overflow
  ffmpeg -y -i image.jpg -filter_complex "[0:v] scale=1280:-1,loop=-1:size=2,trim=0:40,setpts=PTS-STARTPTS,setsar=1,crop='w=1280:h=720:x=0:y=min(max(0, t - 3), (40 - 3 - 3)) / (40 - 3 - 3) * (ih-oh)'" unix.mp4 I want to edit the above command so it can be used for multiple images or a folder containing many images. And give all images used the same size and aspect ratio. Please help me, thank you everyone.
• 20:11
  Cutting sections with -ss and -t is not frame accurate - Théo Champion Newest 'ffmpeg' Questions - Stack Overflow
  I'm using ffmpeg 6.0 to extract small sections from longer videos. According to the doc i can use the -ss option to specify the start time and the -t option to specify the duration and this should result in frame accurate cuts (since FFmpeg 2.1). However, in my testing i found that the cuts are not frame accurate. I'm using the following command: ffmpeg -ss 10 -i ffmpeg -ss 10 -i https://storage.googleapis.com/klap-assets/Frame%20Counter%20%5B4K%2C%2060%20FPS%5D%20%E2%80%93%200100.mp4 -t 10 -y -vcodec libx264 -acodec aac -movflags +faststart out2.mp4 -t 10 -y (...) -- the doc, a video
• 19:52
  Attempting to use recursion, why does my code only download 4 videos and exit? - Andrew Atwood Newest 'ffmpeg' Questions - Stack Overflow
  I am attempting to download videos from an API that I have access to. This should loop through all of the videos that were returned from the API call, save them to disc, use ffmpeg to verify the meta data from the API (this step is necessary because the API is sometimes returning incorrect information), then save attribution information and continue on if no error. However, my output from the below code is simple this: [] Download Done: 0 Saved 'Owner: Anthony �; Owner URL: https://www.pexels.com/ⓐinspiredimages' to animals.txt 13 0 Download Done: (...)
• 17:21
  FFmpeg -ss parameter is the video duration, Output file is empty - noun nil Newest 'ffmpeg' Questions - Stack Overflow
  The main function is to obtain the corresponding video frame based on the input seconds.Before processing, the duration of the video will be obtained to determine whether the input is within the duration range of the video. If so, the corresponding instruction will be executed. > ffprobe input.mp4 ... Duration: 00:00:28.05, start: 0.000000, bitrate: 1136 kb/s > ffmpeg -ss 00:00:28 -i input.mp4 -frames:v 1 output.png ffmpeg version 7.0 Copyright (c) 2000-2024 the FFmpeg developers built with Apple clang version 15.0.0 (clang-1500.3.9.4) configuration: (...)
• 17:05
  ffmpeg: Unrecognized option 'alpha_quality' - László Monda Newest 'ffmpeg' Questions - Stack Overflow
  I want to make transparent videos work in Safari, which doesn't support WebM for this purpose but only H265 with alpha transparency. According to this post, I used Shutter Encoder, but only some of its versions work for this purpose on Mac. Instead of using Shutter Encoder on Mac, I want to use ffmpeg on my Linux PC. Shutter Encoder uses the following command in the background: ffmpeg -threads 0 -hwaccel none -i input.mov -c:v hevc_videotoolbox -alpha_quality 1 -b:v 1000k -profile:v main -level 5.2 -map v:0 -an -pix_fmt yuva420p -sws_flags bicubic -tag:v hvc1 -metadata (...) -- this post, only some of its versions work
• 13:13
  Anomaly in raw I420 video generated by GStreamer - Lea Newest 'ffmpeg' Questions - Stack Overflow
  Situation I'm trying to convert RGBA image data to YUV420P in multiple threads, then send this data to a main thread which splits the data it receives from each thread into separate frames and combines them in order to a video. Currently, I'm using FFmpeg for this task but I've found GStreamer to do a quicker job at colorspace conversion than FFmpeg. Problem The raw video generated by GStreamer does not match the expectations for YUV 4:2:0 planar video data. To test this, I've made a raw RGBA test video of 3 red 4x4 (16 pixel) frames. ffmpeg -f lavfi (...) -- , which corresponds to yuv420p as per their documentation, , multifilesink
• 10:57
  How can I decode audio-file with ffmpeg? [closed] - skltynve Newest 'ffmpeg' Questions - Stack Overflow
  I need to decode audio-file in C using library ffmpeg so I have array of numbers. How can I do that?
• 10:05
  sws_scale YUV --> RGB distorted image - Sami susu Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert YUV420P image (received from H.264 stream) to RGB, while also resizing it, using sws_scale. The size of the original image is 480 × 800. Just converting with same dimensions works fine. But when I try to change the dimensions, I get a distorted image, with the following pattern: changing to 481 × 800 will yield a distorted B&W image which looks like it's cut in the middle 482 × 800 will be even more distorted 483 × 800 is distorted but in color 484 × 800 is ok (scaled correctly). Now (...)
• 08:30
  How to minimize the delay in a live streaming with ffmpeg - Pasquale C. Newest 'ffmpeg' Questions - Stack Overflow
  i have a problem. I would to do a live streaming with ffmpeg from my webcam. I launch the ffserver and it works. From another terminal I launch ffmpeg to stream with this command and it works: sudo ffmpeg -re -f video4linux2 -i /dev/video0 -fflags nobuffer -an http://localhost:8090/feed1.ffm In my configuration file I have this stream: Feed feed1.ffm Format webm NoAudio VideoCodec libvpx VideoSize 720x576 VideoFrameRate 25 # Video settings VideoCodec libvpx VideoSize 720x576 # Video (...)
• 07:36
  Image mask blur processing problem using ffmpeg - andrew kim Newest 'ffmpeg' Questions - Stack Overflow
  I want to apply blur using masking to two or more points in the image. I want to use a circular or other type of blur in ffmpeg rather than a box blur. I wrote the ffmpeg code, but an error continued. When there is only one blur, it works correctly, but when there are two or more blurs, an error occurs. No matter how much I search, I can't figure it out, so I'd like to ask for help. The ffmpeg code I wrote is as follows. ffmpeg -i input.mp4 -i mask.png -filter_complex "` [1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1]; (...)
• 07:29
  does ffmpeg support yuv420sp12le (p012le) - qianqian zhang Newest 'ffmpeg' Questions - Stack Overflow
  does ffmpeg support yuv420sp12le, like p010le, is the ffmpeg support p012le, i.e. 12bpp per component, U and V are interleaved. I see the pixfmt.h of version 5.0, seems there is no format p012le, I see format p016l, 16bpp per component.
• 08:55
  FFmpeg C++ API : Using HW acceleration (VAAPI) to transcode video coming from a webcam [closed] - nicoh Newest 'ffmpeg' Questions - Stack Overflow
  I'm actually trying to use HW acceleration with the FFmpeg C++ API in order to transcode the video coming from a webcam (which may vary from one config to another) into a given output format (i.e: converting the video stream coming from the webcam in MJPEG to H264 so that it can be written into a MP4 file). I already succeeded to achieve this by transferring the AVFrame output by the HW decoder from GPU to CPU, then transfer this to the HW encoder input (so from CPU to GPU). This is not so optimized and on top of that, for the given above config (MJPEG => H264), I (...) -- https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_transcode.c
• 06:48
  fluent-ffmpeg video has stretched image - Martin Newest 'ffmpeg' Questions - Stack Overflow
  I have an mp3 audio file and a jpg image file. I want to combine these two files into a new mp4. I have a working fluent-ffmpeg command that does exactly what I want, except somethings an image will be stretched in the final output video. It seems to happen consistently with jpgs I export from photoshop. Is there any way I can specify in my ffmpeg command to keep the same resolution of my image and not to stretch it? My function below: async function debugFunction() console.log('debugFunction()') //begin setting up ffmpeg const ffmpeg = (...) -- ,
• 06:04
  Why does -filter:v fps=60 need re-encoding? - kwjsksai Newest 'ffmpeg' Questions - Stack Overflow
  I mean, let's say 30 fps -> 60 fps. You just need to duplicate frames. Decode a frame and present it at 2 timepoints. I know mp4 can present a frame at different timepoints, right? So why is re-encoding needed? with h264 codec and heavy computing... I thought it could be just some metadata work. ffmpeg -i 30fps.mp4 -filter:v fps=60 out.mp4
• 03:23
  ffmpeg Loop the short video so it can match the duration of the a long audio [closed] - andrew cummins Newest 'ffmpeg' Questions - Stack Overflow
  I have a list of mp4 files and mp3 files in a directory. I need the following loop the short mp4 so it can match the duration of the mp3 file export mp4 file with new audio. But we want the mp4 in portrait mode. ffmpeg -stream_loop -1 -i video.mp4 -i audio.mp3 -map 0:v -map 1:a -preset slow -shortest -movflags +faststart output.mp4 I have this code in ffmpeg, but i would need to have output in portrait mode. the code works, but the issue is having the video output in portrait mode without stretching the (...)

15 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 22:15
  scalable looping slideshow ffmpeg command - Martin Newest 'ffmpeg' Questions - Stack Overflow
  I have the below ffmpeg command which takes a 2 hour mp3 file and four image files and combines them to renders a single mkv video file where the 4 images appear in a slideshow where each image is displayed for an equal amount of time. I am using these files: https://file.io/XjYl2DDrLn6b Since the video is 2 hours long ( 7200 seconds ) and there are 4 images, each image gets displayed for 7200/4 = 1800 seconds. The logic for determining how to loop these image files is within the 'filter_complex' part of my ffmpeg command. [0:a]concat=n=1:v=0:a=1[a]; Use the (...) -- https://file.io/XjYl2DDrLn6b
• 19:28
  ffmpeg output with label 'v' does not exist in any defined filtler graph - David Royale Newest 'ffmpeg' Questions - Stack Overflow
  Been trying to make this Python code work but it fails up until rendering the final part: import subprocess import re import os def detect_idle_sections(video_path): command = ['ffmpeg', '-i', video_path, '-vf', 'select=\\'gt(scene,0.1)\\'', '-vsync', 'vfr', '-f', 'null', '-'] output = subprocess.check_output(command, stderr=subprocess.STDOUT).decode('utf-8') idle_sections = [] duration = 0.0 for line in (...)
• 18:07
  FMP4 moof box sequence number ordering - Daniel Newest 'ffmpeg' Questions - Stack Overflow
  I wanted to do a basic fragmented mp4 broadcast program with avformat libs and HTML5 video and MSE. This is a live stream and I use avformat to copy h264 data to mp4 fragments. Here is my basic drawing of clients attaching to the stream: So, with words: C1J: First Client joins: avformat process starts ftyp, moov, moof, mdat boxes will be served to Client1 ftyp and moov atoms are both saved for later reuse C2J: Second Client joins (later in time): avformat process is ongoing (because it is (...) --
• 16:12
  dockerized python application takes a long time to trim a video with ffmpeg - Ukpa Uchechi Newest 'ffmpeg' Questions - Stack Overflow
  The project trims YouTube videos. When I ran the ffmpeg command on the terminal, it didn't take too long to respond. The code below returns the trimmed video to the front end but it takes too long to respond. A 10 mins trim length takes about 5mins to respond. I am missing something, but I can't pinpoint the issue. backend main.py import os from flask import Flask, request, send_file from flask_cors import CORS, cross_origin app = Flask(__name__) cors = CORS(app) current_directory = os.getcwd() folder_name = (...)
• 11:39
  "fmpeg" has no attribute "input" - Robin Singh Newest 'ffmpeg' Questions - Stack Overflow
  I had previously built this youtube downloader but when I tested it recently; it stopped working. from pytube import YouTube import ffmpeg import os raw = 'C:\\ProgramData\\ytChache' path1 = 'C:\\ProgramData\\ytChache\\Video\\\\' path2 = 'C:\\ProgramData\\ytChache\\Audio\\\\' file_type = "mp4" if os.path.exists(path1 and path2): boo = True else: boo = False while boo: url = str(input("Link : ")) choice = int(input('Enter 1 for Only Audio and Enter 2 For Both Audio and Video \\n: (...)
• 11:02
  Using FFMPEG and PHP to encode HLS video on the fly - mrsmith Newest 'ffmpeg' Questions - Stack Overflow
  I'm re-encoding a MP4 video to HLS using FFMPEG with PHP. I'm trying to then directly serve to the output to a HTML page's tag. The following script (encode.php) encodes the video as I require and it works if I use the script url directly in VLC player for example but I'm struggling to get the gtml page to play it. The resulting video file should be compatible with most browsers. I use video.src = 'encode.php' on my player html page. Any help appreciated. <?php $input_video = 'whatever.mp4'; // video passthrough // (...)
• 10:35
  frame extracted from a video using opencv or ffmpeg is vague, picture i snip from video is clear - user11317826 Newest 'ffmpeg' Questions - Stack Overflow
  I record a video from roadside, and I want to recognize plate license in video. but I find that if I extract every frame from video using python, the frame is too vague to recognize. I have tried opencv and ffmpeg -i input.mp4 -ss 00:00:10.000 -vframes 1 output.png ` but if I snip video every second the picture is clear what's the reason of this phenomenon, how can I fix it I have tried frame average, it didn't (...)
• 10:05
  FFmpeg dynamic cropping using sendcmd correct syntax? - Sulli Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to dynamically crop a video using FFmpeg's sendcmd filter based on coordinates specified in a text file, but the crop commands do not seem to be taking effect. Here's the format of the commands I've tried and the corresponding FFmpeg command I'm using. Following the documentation https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd, commands in the text file (coordinates.txt) like this: 0.05 [enter] crop w=607:h=1080:x=0:y=0; 0.11 [enter] crop w=607:h=1080:x=0:y=0; ... Ffmpeg command: ffmpeg -i '10s.mp4' (...) -- https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd
• 09:29
  Make a video 10h long while keeping it lightweight in filesize - keanu_reeves Newest 'ffmpeg' Questions - Stack Overflow
  I created an mp4 file with no sound that is 0:17 minutes long. I also have this mp3 file that is 3mins long. I'd like to make a 10h video with those two, while keeping the filesize small. (8-15mb). Is there a way to achieve that with ffmpeg?
• 09:28
  the problem using "yt-dlp --download-sections" [closed] - talent Newest 'ffmpeg' Questions - Stack Overflow
  I tried to use "yt-dlp --download-sections" to download specific segment of YouTube video. But I have confronted some error. If I use the cammand as followed, it will be ok, and download the whole video successfully. yt-dlp -P [path] [URL] But, if I add the "--download-sections" to download specific segment, it seems something wrong. the command is as followed. yt-dlp -P [path] --download-sections "*00:08:06-00:08:17" https://www.youtube.com/watch?v=6Vkmb4cUuLs the eccor message Plus, the operation system is Windows. And I have used (...) -- the eccor message, ffmpeg configuration
• 08:57
  Multiple named pipes in ffmpeg - Toto Briac Newest 'ffmpeg' Questions - Stack Overflow
  This question is the follow-up of this question In my application I want to modify various mp3 and then mix them together. I know I could do it with a single command line in FFmpeg but it can end up very messy since I need to use various filter on each sample and I have five of them. My idea is to edit each sample individually, save them into a pipe and finally mix them. import subprocess import os def create_pipes(): os.mkfifo("pipe1") os.mkfifo("pipe2") def create_samp(): sample= subprocess.run(["ffmpeg", "-i", (...)
• 08:00
  Swift A script of macOS is not running on the M2 chip? - Muhammad Danish Qureshi Newest 'ffmpeg' Questions - Stack Overflow
  I am making a macOS app using SwiftUI, app is working fine on mac Intel chip, mac Apple M1 chip but not working on the mac M2 chip. Below is the following code which is crashing on M2 chip for force unwrapping the data in String(data: data!, encoding: .utf8). I know that force unwrap is not suitable, but for testing purpose I am doing force unwrap. When I run the which ffmpeg in terminal it provides the path in result, no matter which mac terminal is (it always return actual path of ffmpeg), but when run this command from the swift Program it does not found anything and got (...) -- , ,
• 07:40
  Joining realtime raw PCM streams with ffmpeg and streaming them back out - Nathan Ladwig Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use ffmpeg to join two PCM streams. I have it sorta kinda working but it's not working great. I am using Python to receive two streams from two computers running Scream Audio Driver ( ttps://github.com/duncanthrax/scream ) I am taking them in over UDP and writing them to pipes. The pipes are being received by ffmpeg and mixed, it's writing the mixed stream to another pipe. I'm reading that back in Python and sending it to the target receiver. My ffmpeg command is ['ffmpeg', '-use_wallclock_as_timestamps', (...)
• 07:15
  ffmpeg produces duplicate pts with "wallclock_as_timestamps 1" option on MKV - Jax2171 Newest 'ffmpeg' Questions - Stack Overflow
  I need to get real time reference of every keyframe captured by an IP camera. The -wallclock_as_timestamps 1 option seems to do the trick for us, however we are forced to replace the TS output container with MKV to get a correct PTS epoch value 1712996356.833000. Here is the ffmpeg command used: ffmpeg -report -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i rtsp://user:password1ⓐ192.168.5.21/cam/realmonitor?channel=1channel1[1]=1subtype=0 -c:v copy -c:a aac -copyts -f matroska -y rec.mkv The capture process runs without any relevant worning or error messages.  (...)
• 06:00
  FFMPEG vsync drop and regeneration - Lhh92 Newest 'ffmpeg' Questions - Stack Overflow
  According to the ffmpeg documentation vsync parameter Video sync method. For compatibility reasons old values can be specified as numbers. Newly added values will have to be specified as strings always. drop As passthrough but destroys all timestamps, making the muxer generate fresh timestamps based on frame-rate. It appears that the mpegts mux does not regenerate the timestamps correctly (PTS/DTS); however, piping the output after vsync drop to a second process as raw h264 does force mpegts to regenerate the PTS. Generate test (...)

14 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 18:39
  Script doesnt recognize bars / length right for cutting audio , ffmpeg terminal - totzillarbeats Newest 'ffmpeg' Questions - Stack Overflow
  This terminal script doesn't recognize bars / length right for cutting audio, maybe somebody knows what's wrong with the calculation ... Would be happy about any help the cutting already works! #!/bin/bash # Function to extract BPM from filename get_bpm() local filename="$1" local bpm=$(echo "$filename" | grep -oE '[0-9]1,3' | head -n1) echo "$bpm" # Function to cut audio based on BPM cut_audio() local input_file="$1" local bpm="$2" local output_file="$input_file%.*_cut.$input_file##*." # (...)
• 15:01
  Cannot get ffmpeg to work after installing from homebrew - phizzy Newest 'ffmpeg' Questions - Stack Overflow
  I installed ffmpeg through homebrew but when I try to run it, even just typing in ffmpeg I get the following error message: dyld: Library not loaded: /usr/local/lib/liblzma.5.dylib Referenced from: /usr/local/bin/ffmpeg Reason: Incompatible library version: ffmpeg requires version 8.0.0 or later, but liblzma.5.dylib provides version 6.0.0 Trace/BPT trap: 5 I've tried running brew update and brew upgrade but that didn't change anything. Running brew doctor the only error I get is: Warning: You have a curlrc file If you have (...)
• 14:18
  script doesnt recognize bars / lenght right for cutting audio , ffmpeg terminal - totzillarbeats Newest 'ffmpeg' Questions - Stack Overflow
  This Terminal script doesnt recognize bars / lenght right for cutting audio , maybe somebody knows whats wrong with the calculation :) Would be happy about any help the cutting already works ! #!/bin/bash # Function to extract BPM from filename get_bpm() local filename="$1" local bpm=$(echo "$filename" | grep -oE '[0-9]1,3' | head -n1) echo "$bpm" # Function to cut audio based on BPM cut_audio() local input_file="$1" local bpm="$2" local output_file="$input_file%.*_cut.$input_file##*." # Appends "_cut" (...)
• 12:13
  ffmpeg failed to load audio file - Vaishnav Ghenge Newest 'ffmpeg' Questions - Stack Overflow
  Failed to load audio: ffmpeg version 5.1.4-0+deb12u1 Copyright (c) Failed to load audio: ffmpeg version 5.1.4-0+deb12u1 Copyright (c) 2000-2023 the FFmpeg developers built with gcc 12 (Debian 12.2.0-14) configuration: --prefix=/usr --extra-version=0+deb12u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d (...)
• 09:23
  webrtc to rtmp send video from camera to rtmp link - Leo-Mahendra Newest 'ffmpeg' Questions - Stack Overflow
  i cant send the video from webrtc which is converted to bufferd data for every 10seconds and send to server.js where it takes it via websockets and convert it to flv format using ffmpeg. i am trying to send it to rtmp server named restreamer for start, here i tried to convert the buffer data and send it to rtmp link using ffmpeg commands, where i initially started to suceesfully save the file from webrtc to mp4 format for a duration of 2-3 minute. after i tried to use webrtc to send video data for every 10 seconds and in server i tried to send it to rtmp but i cant send it, but (...)
• 02:43
  Why do my Windows filenames keep getting converted in FFMPEG? - GeneralTully Newest 'ffmpeg' Questions - Stack Overflow
  I'm running a script that walks through a large library of .flac music, making a mirror library with the same structure but converted to .opus. I'm doing this on Windows 11, so I believe the source filenames are all in UTF-16. The script calls FFMPEG to do the converting. For some reason, uncommon characters keep getting converted to different but similar characters when the script runs, for example: 06 xXXi_wud_nvrstøp_ÜXXx.flac gets converted to: 06 xXXi_wud_nvrstøp_ÜXXx.opus They look almost identical, but the Ü and I believe (...)

13 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 04:22
  Same FFmpeg command produces different Matroska MKV output file checksum [closed] - finefoot Newest 'ffmpeg' Questions - Stack Overflow
  The following exemplary FFmpeg command takes an MP4 file, doesn't do any re-encoding, but simply writes the output to an MKV file: ffmpeg -i input.mp4 -c copy output.mkv If I run the same command twice, with two different output files: ffmpeg -i input.mp4 -c copy output1.mkv ffmpeg -i input.mp4 -c copy output2.mkv The resulting files will have differing checksums: aa46d308197cb08d71f271c61d5412ad output1.mkv 8b48c3ebdbf2384705fcb78e864d12e3 output2.mkv This difference disappears if I convert them back to an MP4 container: ffmpeg (...)
• 12:28
  Extracting frames from a video does not work correctly [closed] - Al Tilmidh Newest 'ffmpeg' Questions - Stack Overflow
  Using the libraries (libav) and (ffmpeg), I try to extract frames as .jpg files from a video.mp4, the problem is that my program crashes when I use the CV_8UC3 parameter, but by changing this parameter to CV_8UC1, the extracted images end up without color (grayscale), I don't really know what I missed, here is a minimal code to reproduce the two situations: #include extern "C" #include #include int main() AVFormatContext *formatContext = nullptr; if (avformat_open_input(&formatContext, "video.mp4", nullptr, nullptr) (...)
• 18:52
  Why do my Windows filenames keep getting converted in Python? - GeneralTully Newest 'ffmpeg' Questions - Stack Overflow
  I'm running a script that walks through a large library of .flac music, making a mirror library with the same structure but converted to .opus. I'm doing this on Windows 11, so I believe the source filenames are all in UTF-16. The script calls FFMPEG to do the converting. For some reason, uncommon characters keep getting converted to different but similar characters when the script runs, for example: 06 xXXi_wud_nvrstøp_ÜXXx.flac gets converted to: 06 xXXi_wud_nvrstøp_ÜXXx.opus They look almost identical, but the Ü and I believe also the (...)
• 17:10
  conversion from YUV to RGB color - Prashant Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to convert FFMPEG's Intensity color map from yuv format to rgb. It should give you colors as shown in the color bar in the image. You can generate a spectrogram using command: ffmpeg -i words.wav -lavfi showspectrumpic=s=224x224:mode=separate:color=intensity spectrogram.png Here is the code: import numpy as np def rgb_from_yuv(Y, U, V): Y -= 16 U -= 128 V -= 128 R = 1.164 * Y + 1.596 * V G = 1.164 * Y - 0.392 * U - 0.813 * V B = 1.164 * Y + 2.017 * U # Clip and normalize RGB (...) -- FFMPEG's Intensity,
• 16:13
  ffmpeg merge multiple audio files with offset and duration into a single video file [closed] - CLIFFORD P Y Newest 'ffmpeg' Questions - Stack Overflow
  Trying to merge two audio files into a single video at specific offset and duration What I tried checked previous stack overflow questions and answers, no one matched my requirements, below is the command i tried ffmpeg -i 5a54b260-f8a0-11ee-99e0-2d7afd1305f3.mp4 \\ -i 62d24fb0-f8a0-11ee-99e0-2d7afd1305f3.wav \\ -i 76cf3190-f8a0-11ee-99e0-2d7afd1305f3.wav \\ -filter_complex "[1:a]adelay=0|0,atrim=0:18[a1trimmed]; \\ [2:a]adelay=20000|20000,atrim=0:10[a2trimmed];\\ [a1trimmed][a2trimmed]amix=inputs=2[aout]" \\ -map 0:v -map "[aout]" -c:v copy -c:a aac (...)
• 09:53
  ffmpeg produce pts duplicati con "wallclock_as_timestamps 1" on MKV - Jax2171 Newest 'ffmpeg' Questions - Stack Overflow
  I need to get real time reference of every keyframe captured by an IP camera. The -wallclock_as_timestamps 1 option seems to do the trick for us, however we are forced to replace the TS output container with MKV to get a correct PTS epoch value 1712996356.833000. Here is the ffmpeg command used: ffmpeg -use_wallclock_as_timestamps 1 -rtsp_transport tcp -i rtsp://admin:adminⓐ192.168.1.5/h264/ch1/main/av_stream -c:v copy -c:a aac -copyts -f matroska -y rec.mkv The capture process runs without any relevant worning or error messages. However, playing the captured video (...)
• 06:40
  FFMPEG not turning a series of .ppm files into a video - Radiation Sky Playz Newest 'ffmpeg' Questions - Stack Overflow
  I don't have much of an idea of what i'm doing. also i don't use stackoverflow so i still don't know what i'm doing xd I'm trying to do this: ffmpeg -framerate 45 -i screen_200x200_%d.ppm -c:v libx264 -r 30 -pix_fmt yuv420p output52234.mp4 and it's making this appear: jajooⓐjajoospc:~/Documents/fff$ ffmpeg -framerate 45 -i screen_200x200_%d.ppm -c:v libx264 -r 30 -pix_fmt yuv420p output52234.mp4 ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)  (...)
• 03:25
  FFmpeg RTSP drop rate increases when frame rate is reduced - Avishka Perera Newest 'ffmpeg' Questions - Stack Overflow
  I need to read an RTSP stream, process the images individually in Python, and then write the images back to an RTSP stream. As the RTSP server, I am using Mediamtx [1]. For streaming, I am using FFmpeg [2]. I have the following code that works perfectly fine. For simplification purposes, I am streaming three generated images. import time import numpy as np import subprocess width, height = 640, 480 fps = 25 rtsp_server_address = f"rtsp://localhost:8554/mystream" ffmpeg_cmd = [ "ffmpeg", "-re", "-f", "rawvideo",  (...) -- https://github.com/bluenviron/mediamtx, https://github.com/FFmpeg/FFmpeg, https://github.com/bluenviron/mediamtx?tab=readme-ov-file#opencv

12 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 20:40
  How do I upscale an iOS App Preview video to 1080 x 1920? [closed] - Benjamin Thiel Newest 'ffmpeg' Questions - Stack Overflow
  I just captured a video of my new app running on an iPhone 6 using QuickTime Player and a Lightning cable. Afterwards I created an App Preview project in iMovie, exported it and could successfully upload it to iTunes Connect. Apple requires developers to upload App Previews in different resolutions dependent on screen size, namely: iPhone 5(S): 1080 x 1920 or 640 x 1136 iPhone 6: 750 x 1334 (what I have) iPhone 6+: 1080 x 1920 Obviously, 1080 x 1920 is killing two birds with one stone. I know that upscaling isn't the perfect (...)
• 21:55
  How to get the buffer of the first frame of a video using ffmpeg? (Node.js) - Mahmoud Walid Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use child_processes and ffmpeg to do this, but it returns this error: FFmpeg stderr: [AVFilterGraph ⓐ 00000157fd55abc0] No option name near 'eq(n, 0)"' [AVFilterGraph ⓐ 00000157fd55abc0] Error parsing a filter description around: [AVFilterGraph ⓐ 00000157fd55abc0] Error parsing filterchain '"select=eq(n\\, 0)"' around: [vost#0:0/libx264 ⓐ 00000157fd574700] Error initializing a simple filtergraph Error opening output file pipe:1. Error opening output files: Invalid argument FFmpeg process exited with code: (...)
• 17:01
  how to record screen of windows using ffmpeg inside WSL [closed] - Santhosh Newest 'ffmpeg' Questions - Stack Overflow
  I have WSL2 and ubuntu installed inside it. I have ffmpeg command line installed inside it. Now I am not sure how to record the screen. Can someone help me what command options to be used to record screen (including windows UI) I tried the below command. Opened powershell in windows, then entered into wsl and then ran the below command ffmpeg -f x11grab -y -framerate 30 -s 1920x1080 -i :0.0 -c:v libx264 -preset superfast -crf 18 out.mp4 but it results in blank screen (...)