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• I want to convert the decoded h264 packet data to an es data file

  26 juillet 2017, par user8335183

  I want to convert the decoded h264 packet data to an es data file(dump), but I do not know what to do.
  What should I do ?

• FFmpeg massive data loss when writing large data and swapping segments

  25 avril 2023, par Bohdan Petrenko

  I have an ffmpeg process running which continiously writes audio data to two 30 seconds (for testing, I'm actually planning to use 5 minutes) segments. The problem is that when I write some audio data with length more than size of two segments (60 seconds), 8-17 seconds of audio is lost. Here is how I run FFmpeg and write data :

  


      _ffmpeg = Process.Start(new ProcessStartInfo
    {
        FileName = "ffmpeg",
        Arguments = 
            $"-y -f s16le -ar 48000 -ac {Channels} -i pipe:0 -c:a libmp3lame -f segment -segment_time {BufferDuration} -segment_format mp3 -segment_wrap 2 -reset_timestamps 1 -segment_list \"{_segmentListPath}\" \"{segmentName}\"",
        UseShellExecute = false,
        RedirectStandardInput = true
    })!;
    // Channels is usually 1, BufferDuration is 30


  


  And here is how I write data :

  


  public async Task WriteSilenceAsync(int amount)
{
    if (amount > _size) amount = _size; // _size is 48000 * 1 * 2 * 30 * 2 = 5760000 (size of 1 minute of audio)
    
    var silence = _silenceBuffer.AsMemory(0, amount);
    await _ffmpeg.StandardInput.BaseStream.WriteAsync(silence);
}


  


  I tried to change the ffmpeg parameters and ways I write data. But I haven't found the solution.

  


  I'm sure that the problem is caused by ffmpeg segments, because if I disable segmenting and write audio to a single file, there are no problems with data loss or audio missmatch. I also sure that amount of silence to add in WriteSilenceAsync() method is calculated right. I'm not sure if the problem appears with data length more than 30 seconds but less then 1 minute, but I think it doesn't.

  


  I don't know how to solve this problem and would be glad to see any suggestions or solutions.

  


• Get Youtube video original mp4 URL in Googlevideo.com [on hold]

  28 février 2015, par Matan Yedayev

  I want to get the Youtube video original URL in Googlevideo.com

  I want to show you example

  This is Youtube video URL : https://www.youtube.com/watch?v=hzixp8s4pyg

  This is the original mp4 of this video : http://r1---sn-cx1x9-ua8z.googlevideo.com/videoplayback?dur=144.938&signature=D3219628406AA488C697C4616F72503D0B50648F.476AD453606535AA38B6BB91433699DF603CC47D&id=o-AI8eX0_dbEW53bTjkKEJ9LWnFBYwk9D0aFTen4hI4X0A&key=yt5&mime=video/mp4&upn=-vxekmrnk18&ms=au&sver=3&ip=79.178.10.184&pl=24&itag=18&ratebypass=yes&mv=m&sparams=dur,id,initcwndbps,ip,ipbits,itag,mime,mm,ms,mv,pl,ratebypass,source,upn,expire&expire=1425184360&mm=31&source=youtube&mt=1425162701&fexp=901802,905657,907263,916640,927622,937412,9406564,9406664,943917,947225,947240,948124,951703,952302,952605,952612,952620,952901,955301,957201,959701,960602,964703&initcwndbps=1117500&ipbits=0&signature=

  How could I develop program that would give me this mp4 URL ?

  Programs that succes to get this URL : jeckman/Youtube-Downloader at git.

  One more example is : http://ytapi.com/?format=direct&vid=hzixp8s4pyg&itag=18