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• How much of modern FFmpeg is written by Fabrice Bellard ?

  17 décembre 2022, par Hashim Aziz

  FFmpeg is considered by many to be the work of Fabrice Bellard, and maybe even his magnum opus, but since he stopped contributing to the project (under the pseudonym Gérard Lantau) in 2004, I wondered how much of it can actually still be said to be his. By comparison, Linus Torvalds' Wikipedia page states :

  


  


  As of 2006, approximately 2% of the Linux kernel was written by
Torvalds himself.[28] Because thousands have contributed to it, his
percentage is still one of the largest. However, he said in 2012 that
his own personal contribution is now mostly merging code written by
others, with little programming.

  


  


  This despite the fact that Torvalds is still an active contributor to the Linux kernel, whereas Bellard hasn't been an active contributor to FFmpeg for almost two decades.

  


  FFmpeg being an open-source project tracked with Git, it seems like the question should be technically and objectively answerable, but as someone who hates mailing lists and the generally archaic ways that big open-source projects like to do things, I wouldn't know where to start in doing so.

  


  Just how much of the modern FFmpeg codebase is Fabrice Bellard actually responsible for, in comparison to the other FFmpeg devs ?

  


• Facebook Graph API - Getting error 2207026 when trying to upload video

  22 novembre 2022, par NiVeK92

  I try to upload a video via the graph API but as the title states, I get an error that states that I use an unsupported video format.

  


  I thought maybe the original video file doesn't match the video specifications as defined on https://developers.facebook.com/docs/instagram-api/reference/ig-user/media#video-specifications so I wrote a function to convert the file to match the specification, using ffmpeg with the following command (I tried many different ones, but this is the last one I tried)

  


  ffmpeg -i ${tmpInFile} -vf format=yuv420p -vf scale=-2:720 -pix_fmt yuv420p -r 30 -movflags +faststart -c:v libx264 -b:v 3M -c:a aac -b:a 128k -ac 2 -ar 44100 -shortest -f mp4 ${tmpOutFile}

  


  Unfortunately, the error persists.

  


  Here's the complete process :

  


  First I use await fetch('/api/convert-mp4', { method: 'POST', body: file }); to send the uploaded video file to the backend.

  


  Next I get the blob data from the request with const blob = await request.blob();.

  


  Then I create a temporary file with await fs.writeFile(tmpInFile, await blob.stream()).

  


  Then I call ffmpeg with the above command mentioned above and then read the file with const buffer = await fs.readFile(tmpOutFile);.

  


  Then I send the buffer as response body back to the client with return {status: 200,body: buffer}.

  


  Then I get the blob data from the response with const blob = await convertVideoResponse.blob();.

  


  Finally I convert it back into a file object with
const convertedFile = new File([blob], file.name, { type: 'video/mp4' });

  


  This file I upload to Supabase Storage (https://supabase.com/storage), and get a publicly accessible url (which I confirmed by opening it in an incognito tab).

  


  In the supabase dashboard I can see the video file has the correct media container (video/mp4) and the file size is small enough.

  


  Does anyone have an idea what could be the issue ?

  


  Edit :

  


  By changing the ffmpeg command to use h265 instead of h254 ffmpeg -i ${tmpInFile} -vf format=yuv420p -vf scale=-2:1350 -pix_fmt yuv420p -r 30 -movflags +faststart -c:v libx265 -vtag hvc1 -an -x265-params crf=25 -b:v 3M -c:a copy -c:a aac -b:a 128k -ac 2 -ar 44100 -shortest -f mp4 ${tmpOutFile} I managed to get it to work for some videos but not all, which confuses me, as I assumed that the video attributes should be the same for all videos processed by the same command.

  


• Unclear compile error for mpd with ffmpeg on Mac arm64 architecture (M1)

  24 août 2022, par letsgetsomecodedone

  I tried to compile (and install) mpd via brew with
brew reinstall --build-from-source mpd but ffmpeg seems to have some error with the arm64 architecture as the error states :

  


  Undefined symbols for architecture arm64:
  "av_free(void*)", referenced from:
      AvioStream::~AvioStream() in libdecoder_plugins.a(FfmpegIo.cxx.o)
  "av_malloc(unsigned long)", referenced from:
      AvioStream::Open() in libdecoder_plugins.a(FfmpegIo.cxx.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


  


  I reinstalled ffmpeg (and even it build from source) to make sure it built the arm64 version. Can anyone help me out, about what could be problem ?