2 juin

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

• 11:10
  How to use the actual frame numbers in filenames using ffmpeg when extracting frames? - Joan Venge Newest 'ffmpeg' Questions - Stack Overflow
  Basically I am using ffmpeg to extract every Nth frame from a video. But the filenames appear sequentially from 1 to X. I want to use the actual frame numbers so if it's every 30th frame, then the filenames should be 0, 30, 60, etc. Is this possible? I am doing this in Python using this function: def extract_and_compress_frames(directory, frame_interval=1, crop_width=192, crop_height=108, offset_x=0, offset_y=0): for filename in os.listdir(directory): if filename.endswith(".trec"): # Construct full file path trec_path = os.path.join(directory, (...)
• 09:07
  ffmpeg - converting webm videos generated by Chrome is slow - Nuthinking Newest 'ffmpeg' Questions - Stack Overflow
  I generate webm files in two different ways. One using Chrome WebRTC MediaRecorder, the other one is using a js library which generates the webm video frame by frame (webm-writer-js). The file size of the videos generated is not that different, the fast one is 60% of the slow one but the difference in speed is 1000% Using the basic ffmpeg syntax -i input.webm output.mp4 the files created with Chrome's media recorder take in fact almost 10x time to be converted. The conversion logs differ slightly but overall look very similar to my novice eyes. On the left the fast (...) -- webm-writer-js,
• 09:28
  How can I overlay multiple images with fade-in using ffmpeg? - strangerD Newest 'ffmpeg' Questions - Stack Overflow
  In the working folder, there are text1.png text2.png video.mp4 (all sizes 400x400) I would like to overlay text1 and text2 on this video.mp4 while fading them in. If it was just one image, I could make it with the code below, so I am currently researching ways to improve the code below. ffmpeg -i video.mp4 -loop 1 -i text1.png -filter_complex "[1]fade=in:st=2:d=1:alpha=1[i];[0][i]overlay=x=0:y=0:shortest=1;" output.mp4 Below is the code I created based on the manual and information I found on Google. ffmpeg -i video.mp4 -loop -i text1.png (...)

1er juin

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

• 09:01
  Writing a video frame by frame using ffmpeg - Chris Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to write a video frame by frame using ffmpeg as explained here: http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/ However, I am always getting an OSError: [Errno 22] Invalid argument. I am on Windows 7 and using Python 3.4. Here is the code: import subprocess as sp import numpy as np import time ffmpeg_bin = r'C:\\path\\to\\ffmpeg\\ffmpeg.exe' command = [ffmpeg_bin, '-y', # (optional) overwrite output file if it exists '-f', 'rawvideo',  (...) -- http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/
• 04:41
  What is the purpose of the split filter in FFMpeg? - TheOrbitHeart Newest 'ffmpeg' Questions - Stack Overflow
  In complex filters specifically, is there a situation where it is necessary to use the split filter, rather than use the same input multiple times? For example, consider the following FFmpeg command: ffmpeg -i input.mp4 -filter_complex \\ "[0:v]hflip[out1]; \\ [0:v]boxblur=10[blurred]; \\ [out1][blurred]hstack[out]" \\ -map "[out]" output.mp4 It seems to work perfectly fine, But I saw some tutorials consistently using "split" in situations like this, where the input is split before any other filters are applied, making me wonder if there are unintended (...)

31 mai

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

• 23:08
  Using FFMPEG: How to do a Scene Change Detection? with timecode? - Mozart Newest 'ffmpeg' Questions - Stack Overflow
  Based on this article it seems that it is possible to use FFMPEG to detect scene change in videos: http://www.luckydinosaur.com/u/ffmpeg-scene-change-detector Now I have a video that displays a book text and when the text (word or sentence) is spoken it gets highlighted. Something like this audio book: https://youtu.be/lA7L6ZNVKjc I need to know the timestamp when the text gets highlighted (hence scene change), this will allow me to add timestamp tags on my youtube video, so it becomes easier for listeners to navigate through the audiobook. What is (...)
• 21:02
  AttributeError: module 'librosa' has no attribute 'output' - Aditya Kumar Newest 'ffmpeg' Questions - Stack Overflow
  I am using librosa 0.6 in anaconda and i have also installed ffmpeg but i am still getting this error the code is a = np.exp(spectrum) - 1 p = 2 * np.pi * np.random.random_sample(spectrum.shape) - np.pi for i in range(50): S = a * np.exp(1j * p) x = librosa.istft(S) p = np.angle(librosa.stft(x, N_FFT)) librosa.output.write_wav(outfile, x, sr)
• 13:28
  How should I add watermark to a video Using ReactJS - basit khan Newest 'ffmpeg' Questions - Stack Overflow
  I want to add a watermark to a video and then upload it to firebase , So if i Get the video from firebase it should be shown with watermark and also can be downlowded with watermark appended. Didn't find any solution yet for this
• 13:27
  Android FFmpeg export of the Video in SurfaceView with Pinch/Scale/Zoom/Bg Color Operation - CoderDev Newest 'ffmpeg' Questions - Stack Overflow
  I'm working on a feature in which I need to perform some actions on the selected video from the gallery and then upload it on the Backend server, on this selected video I can pinch it to scale up/down/zoom in/out and place it anywhere on the screen (even out side the screen), just like the Instagram app. I can apply a background color which will be applied to the whole space of the outer of the video frame. After all the above changes I'm exporting the changes to the output video that will contain all the changes that I've mentioned above. I'm using the FFMpeg (...)
• 12:48
  Moviepy not updating FFmpeg Version after FFmpeg Install? - The_ Game12 Newest 'ffmpeg' Questions - Stack Overflow
  I've been toying around with MoviePy, and recently switched a project to a new computer at home to continue messing around with it. However, I tried running what I had previously written (which ran perfectly fine on the other computer) and I get this: OSError: MoviePy error: failed to read the first frame of video file ./Gameplay/minecraft- gameplay2.mp4. That might mean that the file is corrupted. That may also mean that you are using a deprecated version of FFMPEG. On Ubuntu/Debian for instance the version in the repos is deprecated. Please update to a recent (...)
• 09:58
  How to extract a frame from an INSV format 360 video using Python - Kalpesh Shinde Newest 'ffmpeg' Questions - Stack Overflow
  I have a 360 video captured with an Insta360 X3, which is in the INSV format. I would like to extract a frame from this video using Python, FFmpeg, or any other suitable tool, without using Insta360 Studio to export the video to MP4 first. Here is what I have tried so far: FFmpeg: I attempted to use FFmpeg to directly convert the INSV file to images, but I encountered errors, possibly due to the proprietary nature of the INSV format. ffmpeg -i input.insv -vf "select=eq(n,0)" -q:v 3 output.jpg This command did not work as expected and produced an error. Python (...)
• 06:40
  Can I set rotation field for a video stream with FFmpeg? - Alexander Newest 'ffmpeg' Questions - Stack Overflow
  I have a video file. I open it with MediaInfo utility and I can see a video stream in this file having attribute Rotation 90 (along with other attributes such as CodecID, bitrate etc). Now I have another video file which does not have that attribute Rotation 90, it does not have the Rotation attribute at all. Can I use ffmpeg.exe so that it produces output file with Rotation 90 attribute added and with no other changes? I don't really want to do any transform, just want to set the Rotation attribute. I've tried the -metadata option to no (...)
• 04:46
  FFMPEG in Android Kotlin - processed video should have specific resolution - Utsav Newest 'ffmpeg' Questions - Stack Overflow
  I'm recording video from both the front and back cameras and I get a PIP video and a horizontal stacked video. I need to merge both videos after that. The problem with merging is that it requires both the videos (PIP and stacked) to have the same resolution and aspect ratio. This is not the case. So the FFMPEG command being executed in code to generate both these videos needs to be modified to make the resolution and aspect ratio the same. //app -> build.gradle implementation "com.writingminds:FFmpegAndroid:0.3.2" private fun connectFfmPeg() val overlayX = (...)

30 mai

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

• 21:54
  ffmpeg - Seek to absolute time stamp in MPEG DASH segment [closed] - iBent Newest 'ffmpeg' Questions - Stack Overflow
  I need to extract short audio segments at specific time stamps from specific dash segments. I tried the following: ffmpeg -ss 00:10:00 -i segment_x.m4s -t 10 out.mp3 ss seeks relative to the segment's start time however, and not absolutely. That absolute time data is there however as ffmpeg prints it during the conversation like this: Duration: 00:10:14.01, start: 595.018667, bitrate: 7 kb/s How can I make ffmpeg extract the audio from exactly 00:10:00 to (...)
• 20:39
  Issue with adding FFMPEG to macOS path to convert mp3 to WAV in Python [closed] - AndrewLittle1 Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use a simple program to convert a .MP3 file to a .WAV file in python: from os import path from pydub import AudioSegment src = "test1.mp3" dst = "test1.wav" # convert wav to mp3 sound = AudioSegment.from_mp3(src) sound.export(dst, format="wav") When I try to run the program in an IDE, I am getting a FileNotFoundError this is what the StackTrace looks like: RuntimeWarning: Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work warn("Couldn't find ffprobe or avprobe - defaulting to (...)
• 07:54
  ffmpeg streaming an image failure [closed] - deonst Newest 'ffmpeg' Questions - Stack Overflow
  I am trying stream a static image on the network. Everything I have tried yet so far has failed: Examples: ffmpeg -y -stream_loop -1 -r 1 -i text2.png -vcodec libx264 -crf 17 -pix_fmt yuv420p -f mpegts udp://239.1.250.12:1234 File is generated but unplayable by VLC or any other TS capable device. ffplay complains about input frame errors but still produces a picture after a few seconds. Tried this for youtube solution as well to a local file. ffmpeg -f image2 -loop 1 -i text1.jpg -re -f lavfi -i anullsrc -vf format=yuv420p -c:v libx264 -b:v 2000k -maxrate 2000k (...)
• 22:18
  FFMPEG Concatenating videos with same 25fps results in output file with 3.554fps - Kendra Broom Newest 'ffmpeg' Questions - Stack Overflow
  I created an AWS Lambda function in node.js 18 that is using a static, ver 7 build of FFmpeg located in a lambda layer. Unfortunately it's just the ffmpeg build and doesn't include ffprobe. I have an mp4 audio file in one S3 bucket and a wav audio file in a second S3 bucket. I'm uploading the output file to a third S3 bucket. Specs on the files (please let me know if any more info is needed) Audio: wav, 13kbps, aac (LC), 6:28 duration Video: mp4, 1280x720 resolution, 25 frame rate, h264 codec, 3:27 duration Goal: Create blank video to (...)
• 16:50
  ffmpeg exited with code 1: Input/output error - Alessandro1918 Newest 'ffmpeg' Questions - Stack Overflow
  On my backend Node server, I am trying to read a stream from an online radio station, and save the audio as a file in my computer. As streams don't have start/end, I'm choosing to record an arbitrary value of 5 seconds. For this problem, I'm using the fluent-ffmpeg npm package for ffmpeg wrapper. Also, the ⓐffmpeg-installer/ffmpeg npm package to point to the directory of my local ffmpeg binary. As stream input, I'm reading from 89 FM - A Rádio Rock, a radio from São Paulo, BR, with the stream available at (...) -- fluent-ffmpeg npm package, @ffmpeg-installer/ffmpeg npm package, 89 FM - A Rádio Rock, http://26593.live.streamtheworld.com/RADIO_89FMAAC.aac
• 16:36
  How to process a video to mp4 with ffmpeg for quality and compatibility? - Luis A. Florit Newest 'ffmpeg' Questions - Stack Overflow
  I am beginning to be more serious about video. I am processing my videos with ffmpeg in a fully updated Linux into mp4 to use it in HTML5 directly. Now, I have old AVI videos that I want to convert to mp4 with ffmpeg for use with HTML5. In particular, I have this one: http://luis.impa.br/photo/1101_aves_ce/caneleiro-de-chapeu-preto_femea_Quixada-CE-110126-E_05662+7a.avi (I know, terrible quality... sorry). According to ffprobe: Duration: 00:01:35.30, start: 0.000000, bitrate: 1284 kb/s Stream #0:0: Video: mpeg4 (Simple Profile) (DX50 / 0x30355844), yuv420p, (...) -- http://luis.impa.br/photo/1101_aves_ce/caneleiro-de-chapeu-preto_femea_Quixada-CE-110126-E_05662+7a.avi
• 15:07
  FFMPEG Streaming using RTMP - desto Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to create a stream using ffmpeg to send a video to a Red5 Server. I've already managed to do this using this command: ffmpeg -re -y -i "Videos\\Video1.mp4" -c:v libx264 -b:v 600k -r 25 -s 640x360 -t 40 -vf yadif -b:a 64k -ac 1 -ar 44100 -f flv "rtmp://192.168.0.12/live/videostream" My problem is, when ffmpeg finishes encoding the video, it stops the stream, and thus cuts the video short for 5-10 seconds (for short videos), but this gets worse on larger videos. Is there a way to stop this behavior? I was trying to add a blank 10 (...)
• 14:47
  Convert 2 channel mp4 to each mono wav file using FFMPEG or Python code - Harish Alwala Newest 'ffmpeg' Questions - Stack Overflow
  I am new to audio files and its codecs. I would like to convert a 2 channel mp4 file to a single mono wav files. My understanding is a when I say 2 channel, it stores speech coming from each microphone in a separate channel. And when I split the channels to each individual mono wav files, I get speech of each microphone. My intension here is to get the speech from each channel and convert them to text. This way I can set the name of the speaker based on channel. I tried with ffmpeg and python code as well, unfortunately I get two files with same content. Looking (...) -- ,
• 14:19
  how to generate video thumbnail in node.js? - paynestrike Newest 'ffmpeg' Questions - Stack Overflow
  I am building an app with node.js, I successfully uploaded the video, but I need to generate a video thumbnail for it. Currently I use node exec to execute a system command of ffmpeg to make the thumbnail. exec("C:/ffmpeg/bin/ffmpeg -i Video/" + Name + " -ss 00:01:00.00 -r 1 -an -vframes 1 -f mjpeg Video/" + Name + ".jpg") This code is coming from a tutorial from http://net.tutsplus.com/tutorials/javascript-ajax/how-to-create-a-resumable-video-uploade-in-node-js/ the code above did generate a jpg file but it's not a thumbnail but (...) -- http://net.tutsplus.com/tutorials/javascript-ajax/how-to-create-a-resumable-video-uploade-in-node-js/
• 13:39
  How to compile ffmpeg.dll [closed] - jdauthre Newest 'ffmpeg' Questions - Stack Overflow
  I would like to compile a ffmpeg.dll dynamic link library which includes the full range of codecs, but when I search for guides I can only find resouces to create ffmpeg.exe. Can anyone point to any resources. Thank you in advance.
• 05:18
  Duplicate class I'm already using ffmpeg_kit_flutter_audio in my code: 5.1.0-LTS for audio conversion video_editor: ^2.1.0 - Rafael Dos Santos Coladelo Newest 'ffmpeg' Questions - Stack Overflow
  I'm already using in my code: ffmpeg_kit_flutter_audio-5.1.0-LTS for audio conversion, when you put the video_editor: ^2.1.0 general the error, is there any way to solve it? FAILURE: Build failed with an exception. What went wrong: Execution failed for task ':app:checkDebugDuplicateClasses'. A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable Duplicate class com.arthenica.ffmpegkit.Abi found in modules jetified-ffmpeg-kit-audio-5.1.LTS-runtime (...) -- https://help.gradle.org
• 04:03
  Is it possible to pregenerate m3u8 file? (the playlist only) and skip the transcoding? - Jonathan Lightbringer Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to create a media server, and only want to transcode video when it's played. However I need the playlist in advance so that the client play can load the video metadata. Is this possible? I want to do something like this: Client -> GET m3u8 (pregenerated in advance) Client -> GET ts -> Transcode only this single ts file Client -> GET ts -> Transcode only this single ts file Client -> GET ts -> Transcode only this single ts file I don't want to transcode the entire video at once, I want to be able to only transcode the part that is (...)

29 mai

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

• 00:49
  How to get the dimensions of the first input in ffmpeg [closed] - Arjen Newest 'ffmpeg' Questions - Stack Overflow
  I have the following command: "ffmpeg -i video.mp4 -i input.png -filter_complex [1:v]scale=iw*(iw/920):-1[scaled];[0:v][scaled]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 -c:v libx264 -c:a aac -strict experimental -pix_fmt yuv420p -y output-scaling.mp4" In the scale section, it takes the width of the input.png but i want the width of the video.mp4. Is this possible?
• 16:10
  Rounded corners in subtitle (Advanced Substation Alpha [.ass]) - Leander Mihm Newest 'ffmpeg' Questions - Stack Overflow
  Is it possible to have rounded corners with the BorderStyle 4 in .ass (Advanced Substation Alpha)? I only found out that the BorderStyle 4 exists, because I was looking at this stackoverflow. Is there any good and complete documentation of the Advanced Substation Alpha format? I'm currently using the following configuration: BorderStyle=4 Outline=10 --
• 13:26
  How to correctly apply select filter after trim in ffpeg? [closed] - lakhan dhingra Newest 'ffmpeg' Questions - Stack Overflow
  I am using the following ffmpeg command to trim and select certain portions of the video. ffmpeg -v verbose -i test.mp4 -filter_complex \\ "[0:v]trim=start=5:end=40,setpts=PTS-STARTPTS[v_trimmed]; \\ [v_trimmed]select='between(t,10,20)',setpts=N/FRAME_RATE/TB[v]; \\ [0:a]atrim=start=5:end=40,asetpts=PTS-STARTPTS[a_trimmed]; \\ [a_trimmed]aselect='between(t,10,20)',asetpts=N/SR/TB[a]" \\ -map "[v]" -map "[a]" -y -r 30 output_video.mp4 The above command errors out with the following trace [h264 ⓐ 0x12570a0e0] Reinit context to (...)
• 07:52
  avformat_open_input not read only? is a bug? [closed] - qyt Newest 'ffmpeg' Questions - Stack Overflow
  I'm recording my screen on Windows using the command: ./ffmpeg -f gdigrab -framerate 30 -i desktop -c:v libx264 -crf 20 -preset ultrafast -max_muxing_queue_size 1024 -hls_time 5 -hls_list_size 10 -hls_flags delete_segments -hls_segment_filename "d:\\\\1\\\\file%03d.ts" "d:\\\\1\\\\playlist.m3u8" Then I use the function avformat_open_input to open this m3u8 file, but after calling this function, the m3u8 file stops updating. When I use the command ./ffmpeg -i D:\\1\\video.m3u8 -c copy -f mpegts "srt://xxxxx?streamid=#!::h=live/qyt,m=publish", the test results are the same. However, when I (...)
• 13:26
  How to create a video of a precise duration from a single image or by trimming a video using FFmpeg? [closed] - aas Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to create a video from a single image with a very specific duration of 0.09375 seconds using FFmpeg. I've tried various commands, but I can't seem to get the exact duration I need. The closest I've gotten is 0.080000 seconds. It doesn't always have to be something like 0.09375, but I wanted to have an example for it. I've also tried trimming a video, but from what I've read so far, the encoding of the video can be a problem. Even after trying different FFmpeg commands or using MoviePy directly, I've never arrived at the desired (...)
• 15:10
  In Advanced SubStation Alpha (Ass file) how can I animate each word as it is spoken? - Nick Powers Newest 'ffmpeg' Questions - Stack Overflow
  Hello I am trying to get Ass (Advanced SubStation Alpha) code to animate (highlight in green) each word as it is spoken and then have it revert back to white afterwards. What happens with my code is very odd. At first I cannot even see any text. It then appears with multiple lines overlapped, partially hanging off the screen. From this point it "kind of" works. I can see the desired highlighting happening but because the text is all jumbled and overlapping it can hardly be called a success. In case it is relevant I am using ffmeg to burn in the subtitles. I am using the following (...)
• 14:11
  Coordinates with file format .ASS - Alex Newest 'ffmpeg' Questions - Stack Overflow
  I'm grabbing my text coordinates that I want to use for the file format .ASS and for centering on a 1080 by 1920 video, I have an application that displays where the text is on the video and can retrieve the position, an example of centered position is 310 by 800. When I try to set the position of the text inside the .ASS with those positions it doesn't write the caption where is meant to be. Could some explain how a .ASS positioning works. If use 200 px by 200 px as positioning it places it way further than the center even though the video its a 1080x1920 video, shouldn't (...) -- ,
• 13:47
  Get access to SDL texture pixels - chugadie Newest 'ffmpeg' Questions - Stack Overflow
  Is there anyway (besides the documented slow method) to get access to the texture pixels from an SDL2 texture? SDL_RenderReadPixels says Warning: this is a very slow method and should not be used frequently. I want to point an ffmpeg AVFrame->data over to the texture pixels and have it encode what's in the texture. Basically, screen grab a texture after rendering and blending several textures together. SDL_LockTexture() gives write-only access to the pixels. The docs also say not to expect pixel data to be present in the pointer returned to you. Is it possible with (...)
• 07:46
  easy normalization with FFmpeg - joberry Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to write software to edit audio files. One aspect of this software is a normalization function. Until now, I have been normalizing audio with Audacity. Now, I want to normalize them using FFmpeg from a C# application. I looked into the documentation of FFmpeg and saw that there are different types of normalization. Additionally, FFmpeg has a lot of settings, which I find overwhelming. For Python, I found a nice library that makes it easy to normalize audio: from pydub import AudioSegment from pydub.effects import normalize def (...)
• 07:33
  Issues with Publishing and Subscribing Rates for H.264 Video Streaming over RabbitMQ - Luis Newest 'ffmpeg' Questions - Stack Overflow
  I am working on a project to stream an H.264 video file using RabbitMQ (AMQP protocol) and display it in a web application. The setup involves capturing video frames, encoding them, sending them to RabbitMQ, and then consuming and decoding them on the web application side using Flask and Flask-SocketIO. However, I am encountering performance issues with the publishing and subscribing rates in RabbitMQ. I cannot seem to achieve more than 10 messages per second. This is not sufficient for smooth video streaming. I need help to diagnose and resolve these performance (...)
• 06:09
  FFMPEG command error : audio device not found - Yash Rajput Newest 'ffmpeg' Questions - Stack Overflow
  So, basically i am making a google meet audio recorder (bot) and i wanna automate the audio recording process as soon as i enters into the meet. but my the code is not working as expected. I'm using the FFMPEG to record the audio and save it to the local machine at the desired location but it's throwing the error as shown in the picture.Error that i am getting I am using the correct name of my audio input device but still it's showing the same error , there's only one input audio driver installed on my machine as you can see it in a picture.name of audio (...) -- Error that i am getting, name of audio input device/driver, FFMPEG command

28 mai

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

• 17:51
  how to fix Non-monotonous DTS in output stream 0:1; when using ffmpeg [closed] - xiao xin Newest 'ffmpeg' Questions - Stack Overflow
  When I use ffmpeg to convert m3u8 to mp4, I get some warning, ffmpeg -i xx.m3u8 -c copy demo.mp4 warning is Non-monotonous DTS in output stream 0:1; previous: 3277744, current: 3276712; changing to 3277745. This may result in incorrect timestamps in the output file. Non-monotonous DTS in output stream 0:1; previous: 3277745, current: 3277736; changing to 3277746. This may result in incorrect timestamps in the output file. what should I do to fix (...)
• 12:11
  Problems using Intel Quick Sync H.264 Encoder with FFMPEG (shared) [closed] - Michael Werner Newest 'ffmpeg' Questions - Stack Overflow
  OS: Windows 11 Pro IDE: Visual Studio 2022 PL: C++ Libraries: FFMPEG shared (own x64 Windows build with libmfx) I am trying to encode frames from a framegrabber card with Intel Quick Sync Encoder using libmfx in FFMPEG shared / libav but I am getting an error always. The "same" procedure using ffmpeg.exe of same build works fine. I increased the FFMPEG logging level to the maximum level. The avcodec_send_frame function always returns -22 (which means "Invalid argument"). And I do not get more information from the log output /console. The only (...)
• 22:51
  PyQt QGraphicsScene Render Scene As Video Format - Alex Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to allow the user to export the scene as an mp4 (video format), the items of the scene consists of QGraphicsVideoItem and multiple QGraphicsTextItem, I need to export the scene as it will allow the user to save the video with the text items. I've found one of the ways to do this but the issue is that it will take hours for a simple 5 seconds videos as it saves every image to a byte to create a video, every image is a millisecond. If I change from millisecond to seconds it could speed up but the video will not look as smooth, is there a more efficient way of doing (...)
• 19:48
  Can't write packet with unknown timestamp av_interleaved_write_frame(): Invalid argument - jagvetinte Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to convert a .ts file with this output to mkv: ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers built with Apple clang version 12.0.0 (clang-1200.0.32.27) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.1_4 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt (...)
• 15:16
  ffmpeg not recording frames - RCam Newest 'ffmpeg' Questions - Stack Overflow
  I am using Python to record 5 second videos from 3 webcams at once using ffmpeg. The recordings repeat at intervals of ~25 seconds. The code seems to work except intermittently a recording from one of the cameras will be 0 seconds long. There don't seem to be any obvious errors, and the file is created it just doesn't contain any frames. The key components of the code are: def take_vid1(path1, video_length, sampleN): dt = datetime.now().strftime("%Y_%m_%d_%H_%M_%S") save1 = os.path.join(path1, dt+'_1'+sampleN+'.mp4') command (...) -- https://drive.google.com/file/d/1VKBBsf8pZbqNyYLE6o2C0kFHeBAh2kZ1/view?usp=sharing
• 15:35
  Error with recording headless browser in ruby - KPEBETKA Newest 'ffmpeg' Questions - Stack Overflow
  We want to create a headless browser and record and stream a page in it. To do this, we use Ferrum and ffmpeg. But there is only one image in the output video, although the video duration is correct. Code: require 'ferrum' x = Ferrum::Browser::Xvfb.new(OpenStruct.new( window_size: [1920, 1080] )) x.start b = Ferrum::Browser.new(xvfb: true, browser_options: 'display': ":#x.display_id" ) b.goto 'https://google.com' ffmpeg_command = "ffmpeg -y -video_size 1920x1080 -framerate 25 -f x11grab -i :#x.display_id (...)
• 06:26
  Fingerprint vs transcribing, what is the best approach to identify an audio sample inside another longer audio [closed] - Bernard Wiesner Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to detect a shorter version of a spoken audio sample inside a longer audio (full version). The shorter audio should be the same or very similar to the one inside the longer version. I also need to have a rough estimate of the timestamp where the audio sample was found. Similar questions here: Identify audio sample in a file How to find the location of a specific word in an audio file? What I have researched so far: 1. fingerprints Using chromaprint extract the fingerprints from both audio files and store them in a DB, then compare them (...) -- chromaprint, whisper
• 12:26
  How to tell whether the colors in a video frame decoded by FFmpeg are pre-multiplied by alpha? - smokris Newest 'ffmpeg' Questions - Stack Overflow
  When I decode video frames with FFmpeg (avcodec_decode_video2(), sws_scale()), with some videos (e.g., ProRes4444), I get colors pre-multiplied by alpha, and with other videos (e.g., QuickTime PNG), I get colors that aren't pre-multiplied by alpha. How can I tell whether the colors are pre-multiplied? Alternatively, how can I tell FFmpeg to always provide either pre-multiplied or un-pre-multiplied ("straight alpha") colors?
• 11:03
  FFMpegCore .Net cuts off the fist few (~1.5) seconds of audio - Tim Newest 'ffmpeg' Questions - Stack Overflow
  I want to use FFMpegCore to convert some audio files to raw pcm. I noticed that this always cuts off ~1.5 seconds of my audio from the start. I check my input stream, saved it to HD all good. If use it from cli with the same arguments everything seem fine. I tried -ss 0, no luck. This behavior is observed with .wav (RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz), same issue with different sample rate. I tested mp3 works fine. public async Task ConvertToPcmStreamAsync(Stream inputStream) var outputStream = new MemoryStream(); var (...)
• 12:57
  FFmpeg find_package not found - YoungCoder Newest 'ffmpeg' Questions - Stack Overflow
  CMake cannot find FFmpeg even though everything is right setup. I used vcpkg to install ffmpeg I can't find any information to setup ffmpeg with CMake. I'm on Windows 10 with Visual Studio. Get findFFMPEG and put in ffmpeg folder but doesn't solve the issue. change the folder name to FFMPEG capital letters but still doesn't solve the issue. I get this error: Severity Code Description Project File Line Suppression State Details Error CMake Error at CMakeProject1/CMakeLists.txt:15 (find_package): By not providing "FindFFMPEG.cmake" in (...)
• 10:38
  How to change HLS quality in ijkplayer for flutter or alternative solutions? - gh05t Newest 'ffmpeg' Questions - Stack Overflow
  Hi can anyone help me with this issue, we decided to use the flutter ijkplayer as it's the only player on flutter that supports the option to change playback speed, but it doesn't have the option to change the hls quality, and neither does any other player as per my findings, if anyone knows please share. As for what I've tried, I download the file and split it into 4 files with each file having only one video and audio stream and use a button to change the file. I also tried to look into changing the tracks from master with the player but while FFMpeg does (...) -- github
• 05:54
  I'm new and am trying to convert video files [closed] - ZDM Newest 'ffmpeg' Questions - Stack Overflow
  So I have upscaled videos of the Fallout 1 cinematics but they're in .avi and I'm using Fallout1in2 which has the cinematics in .mve so I'm trying to convert the .avi to .mve and using ffmpeg I have used this command "ffmpeg -i C:\\PATH_Programs\\BOIL1.AVI BOIL1.MVE" but get this error "ffmpeg unable to choose an output format use standard extension for filename or specify the format manually". Am I doing something wrong or is it just not possible to do it this way? I have used this command "ffmpeg -i C:\\PATH_Programs\\BOIL1.AVI BOIL1.MVE" but get this error "ffmpeg (...)
• 08:22
  Flutter: How to use "ffmpeg_kit_flutter" to merge videos? - Hani Kanakri Newest 'ffmpeg' Questions - Stack Overflow
  i am using "ffmpeg_kit_flutter" to merge two videos with code import 'dart:io'; import 'package:ffmpeg_kit_flutter/ffmpeg_kit.dart'; import 'package:ffmpeg_kit_flutter/abstract_session.dart'; import 'package:ffmpeg_kit_flutter/return_code.dart'; import 'package:flutter/material.dart'; import 'package:flutter_bloc/flutter_bloc.dart'; import 'package:wechat_assets_picker/wechat_assets_picker.dart'; import (...)
• 08:00
  FFMPEG for merging video and audio sources from URLs as a stream - Michael Amir Newest 'ffmpeg' Questions - Stack Overflow
  If I wanted to play a video stream over the network but the video and audio are separated into two different URLs, can I use FFMPEG to stream merge those two sources? Because waiting for FFMPEG to merge both files into a single local file will probably take sometime which wouldn't be nice for the user experience.
• 07:02
  php ffmpeg cannot save video to system temporary folder - user2818066 Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to covert a video to h.264 format. I can save the new video to a normal directory but saving the new video to a Windows temp file fails. However I can manage to save a snapshot image from the video into Windows temp folder without problem. I cannot figure out what is the problem? require_once(dirname(__FILE__).'/../vendor/autoload.php'); function get_ffmpeg_exe_path_arr_def() return( array( 'ffmpeg.binaries' => "C:/bin/ffmpeg.exe", 'ffprobe.binaries' => "C:/bin/ffmpeg.exe", 'timeout' => 3600000000, (...)
• 06:58
  file samples into frame : avcodec_fill_audio_frame - Mr.Wang from Next Door Newest 'ffmpeg' Questions - Stack Overflow
  Rust binding https://github.com/larksuite/rsmpeg of ffmpeg. I try to fill AVFrame with samples as below. let bgm_samples : AVSamples = ...; assert_eq!(bgm_samples.nb_channels, 1); assert_eq!(bgm_samples.sample_fmt, AV_SAMPLE_FMT_FLTP); let mut frame = AVFrame::new(); frame.set_nb_samples(bgm_samples.nb_samples); frame.set_ch_layout(AVChannelLayout::from_nb_channels(1).into_inner()); frame.set_format(bgm_samples.sample_fmt); frame.set_sample_rate(22050); frame .alloc_buffer() .context("Could not allocate frame (...) -- https://github.com/larksuite/rsmpeg
• 04:40
  ffmpeg conversion increase bitrate - Robert D Weir Newest 'ffmpeg' Questions - Stack Overflow
  When extracting Audio streams using ffmpeg from containers such as MP4, how does ffmpeg increase bitrate, if it is higher than the source bitrate? An example might be ffmpeg -i video.mp4 -f mp3 -ab 256000 -vn music.mp3. What does ffmpeg do if the incoming bitrate is 128k? Does it interpolate or default to 128k on the output music.mp3? I know this seems like not a so-called "programming question" but ffmpeg forum says it is going out of business and no one will reply to posts (...)

27 mai

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

• 23:36
  Extracting frames from video uniformly using ffmpeg (and doing it fast) - Sergio Newest 'ffmpeg' Questions - Stack Overflow
  I'm using this code to extract frames from a video: duration=$(ffprobe -v error -select_streams v:0 -show_entries stream=duration -of default=noprint_wrappers=1:nokey=1 "$input_video") # Calculate the time interval to uniformly extract frames fps=$(bc -l <<< "($num_frames)/$duration") fps=$(printf "%.2f" "$fps") echo "Extracting frames..." # Use FFmpeg to extract frames ffmpeg -loglevel quiet -i "$input_video" -vf fps="$fps" -q:v 2 "$output_folder/frame_%04d.jpg" This takes a lot of time even if I need a small number of (...)
• 20:31
  Ffmpeg - Video is missing audio after merging - Ondřej Omar Martínek Newest 'ffmpeg' Questions - Stack Overflow
  tl;dr I am trying to merge two videos using concat command. The videos merge well but the audio is missing. I get a warning message about "New audio stream with inder 1 at pos7354 and DTS 15s" which is exactly the time where the second video starts. I don't care about the audio stream from the first video, it is just a thumbnail, but I want the second video audio to work. I merged the files using: ffmpeg -i list.txt -c copy output.mp4
• 16:44
  install ffmpeg on amazon ecr linux python - Luka Savic Newest 'ffmpeg' Questions - Stack Overflow
  I'm trying to install ffmpeg on docker for amazon lambda function. Code for Dockerfile is: FROM public.ecr.aws/lambda/python:3.8 # Copy function code COPY app.py $LAMBDA_TASK_ROOT # Install the function's dependencies using file requirements.txt # from your project folder. COPY requirements.txt . RUN yum install gcc -y RUN pip3 install -r requirements.txt --target "$LAMBDA_TASK_ROOT" RUN yum install -y ffmpeg # Set the CMD to your handler (could also be done as a parameter override outside of the Dockerfile) CMD (...)
• 11:04
  FFmpeg not connecting to the NamedPipeServerStream - Arthur Edgarov Newest 'ffmpeg' Questions - Stack Overflow
  I am implementing a function to merge audio and video into a single stream using FFmpeg tool. The problem I have right now is that FFmpeg is not connecting to the pipes and I have no idea why. Can someone help me with this issue? Questions I already read: ffmpeg process how to read from pipe to pipe in c# ffmpeg output pipeing to named windows pipe How to use pipe in ffmpeg within c# Using pipes with FFMpeg as an input Arguments: -i "\\\\.\\pipe\\FFmpeg_8daf7" -i "\\\\.\\pipe\\FFmpeg_46100" -c:v copy -map 0:v:0 -map 1:a:0 -shortest -f mp4 (...)
• 11:53
  How to convert ffmpeg shell script parameters to php ffmpeg code? - user2818066 Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert a video to h.264 codec. I can run ffmpeg from shell successfuly using this command: ffmpeg.exe -i C:/Users/fd/motorboat_org.mp4 -c:v libx264 -preset medium -crf 20 -c:a aac -b:a 160k -vf format=yuv420p -movflags +faststart C:/Users/fd/motorboat_2.mp4 How can I execute the same job in php ffmpeg using create method? How to get my following code correct to do the job? function get_ffmpeg_exe_path_arr_def() return( array( 'ffmpeg.binaries' => "C:/bin/ffmpeg.exe", 'ffprobe.binaries' => "C:/bin/ffmpeg.exe",  (...)
• 09:58
  My stitched frames colors looks very different from my original video, causing my video to not be able to stitch it back properly [closed] - Wer Wer Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to extract some frames off my video to do some form of steganography. I accidentally used a 120fps video, causing the files to be too big when i extract every single frame. To fix this, I decided to calculate how many frames is needed to hide the bits (LSB replacement for every 8 bit) and then extract only certain amount of frames. This means if i only need 1 frame, ill extract frame0.png ill remove frame0 from the original video encode my data into frame0.png stitch frame0 back into ffv1 video concatenate frame0 video to the rest of the video, frame0 (...) -- Frame0.mkv, original.mkv, results.mkv
• 01:04
  Using ffmpeg to remove green screen from video - CYAD Newest 'ffmpeg' Questions - Stack Overflow
  I have a video: https://drive.google.com/file/d/1tiP2fX0Xfc6YjIymcHyEXP8-JqEJrlgG/view I'm trying to use ffmpeg to remove the green screen but none of the commands I use work. I saved a frame as a png and was able to remove the green from it: ffmpeg -i green.png -vf chromakey=green:0.1 out.png but the video edit does nothing. ffmpeg -i video.mp4 -vf chromakey=DarkGreen:similarity=0.2:blend=0.3 output4.mov I'm on a windows machine and need to output a format iOS and Android can use, though multiple formats are fine. Any (...) -- https://drive.google.com/file/d/1tiP2fX0Xfc6YjIymcHyEXP8-JqEJrlgG/view