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• Encode live audio stream with ffmpeg

  11 novembre 2015, par Victor Canezin de Oliveira

  Someone please help me.

  I’m trying to encode a live audio stream with ffmpeg. I’m using it Chrome’s native client.

  It’s getting the audio from GetUserMedia() and sending it to pnacl. It receives the audio and send it to ffmpeg to encode. The problem is the final audio is chopped.

  I think the problem is that the codec frame_size is larger than the stream nb_samples (1152 and 480 respectively) and it’s leaving a "blank" audio data at the end of each frame (I’m no audio expert).

  I am creating the AVFrame like this :

  AVFrame *frame = av_frame_alloc();
  
  frame->nb_samples = nb_samples; //(I get it from the stream)
  
  AVSampleFormat sample_fmt = ost->st->codec->sample_fmt;
  
  // nb_channels, buffer and buffer_size I get from the stream
  
  
  
  avcodec_fill_audio_frame(frame, nb_channels, sample_fmt, buffer, buffer_size, 0);

  And encoding with avcodec_encode_audio2

  I am using a mix of nacl example and muxing.c example from ffmpeg.

  Can someone help me ?

• Concatenate DASH audio and video to single file

  13 mars 2017, par Andreas

  First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.

  To mention what I already tested :

  • concatenate via the Unix terminal command cat ; unfortunately this won’t help to make the video playable in any media player again
  • using ffmpeg’s merge abilities via files.txt ; with the same unsuccessful result

  I’m definitely not an expert (otherwise I probably wouldn’t ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).

  Don’t get me wrong : I don’t want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.

  I also tried to make a own mpd file, but the "stream" won’t play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec :

  id="live-hd_H264"
  
  mimeType="video/mp4"
  
  codecs="avc1.4d401f"
  
  width="396"
  
  height="704"

  So, can anybody help me ?

  Kind regards !

• Concatenate DASH audio and video to single file

  18 mars 2019, par Andreas

  First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.

  To mention what I already tested :

  • concatenate via the Unix terminal command cat ; unfortunately this won’t help to make the video playable in any media player again
  • using ffmpeg’s merge abilities via files.txt ; with the same unsuccessful result

  I’m definitely not an expert (otherwise I probably wouldn’t ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).

  Don’t get me wrong : I don’t want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.

  I also tried to make a own mpd file, but the "stream" won’t play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec :

  id="live-hd_H264"
  
  mimeType="video/mp4"
  
  codecs="avc1.4d401f"
  
  width="396"
  
  height="704"

  So, can anybody help me ?

  Kind regards !