16 avril

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

• 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 (...)
• 04:19
  AVFilterGraph cancel initiating - 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 (...)