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• Creating a single file per size for MPEG-DASH using ffmpeg command

  2 septembre 2020, par New Dev

  I am trying to generate to generate the following outputs from a single movie file :

  


  540.mp4
1080.mp4
output.mpd
master.m3u8


  


  First, does it make sense for each .mp4 to contain both video and audio streams ? If not, then an additional audio stream file can work too.

  


  Second, is it possible to create the above files from a (single ?) ffmpeg command ?

  


  When I do this this :

  


  ffmpeg -i input.mov -map 0:v -map 0:v -map 0:a \
  -c:v h264 -c:a aac \
  -filter:v:0 "scale=-2:540" \
  -filter:v:1 "scale=-2:1080" \
  -f dash -single_file 1 \
  -seg_duration 6 -hls_playlist 1 \
  output.mpd


  


  It produces three additional m3u8 files (per stream) and it produces 3 mp4 files - 2 for video streams and 1 for audio - with a default name like output-stream0.mp4.

  


  Is there a way to rename each output-streamX.mp4 to be more descriptive ? Is there a way to avoid splitting video and audio into multiple files ?

  


• avformat/dashdec : The segments in dash file doesn't read completely when segment...

  2 septembre 2024, par jiangjie

  avformat/dashdec : The segments in dash file doesn't read completely when segment's size and duration is very small.
  If the segment is very small, avformat_find_stream_info
  
  will read all audio/video data in this segment.
  
  cur->is_restart_needed is set to 0 later in dash_read_packet,
  
  and no chance to be set to 1 again in the read_data function.
  Reproduction :
  
  ffmpeg -f lavfi -i mandelbrot -f lavfi -i anullsrc -c:v vp8 \
  
   -g 5 -r 5 -c:a libopus -use_template 0 -seg_duration 1 \
  
   -t 15 -y test_720.mpd
  
  ffprobe -show_packets test_720.mpd
  

  • [DH] libavformat/dashdec.c

• dash.js four channels audio stream not working

  19 juillet 2016, par Carlos Chacon

  Does dash.js supports 4 channels in the audio stream ?

  I’m using webm, mp4 container : h254 and acc audio stream.

  For the case that the acc audio stream is 2 channels it works fine, both video and audio play correctly.

  I’m using FFMPEG to create the files and WOWZA to setup the DASH streaming.

  For the case that the acc audio stream is 4 channels I get the following error :

   Video can't be played because the file is corrupt.

  Command line to generate the 2-channels file :

  ffmpeg -i video_in.mp4 -i audio_in_4ch.wav -c:v copy -c:a aac -ac 2 output_2channels.mp4

  Command line to generate the 4-channels file :

  ffmpeg -i video_in.mp4 -i audio_in_4ch.wav -c:v copy -c:a aac -ac 4 output_4channels.mp4

  This is the fmmpeg -i information printed for each file :

  2 Channels output file details :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_2channels.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.37.101
  
    Duration: 00:00:17.59, start: 0.000000, bitrate: 901 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1024x512 [SAR 1:1 DAR 2:1], 894 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  4 Channels output file details :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_4channels.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.37.101
  
    Duration: 00:00:17.59, start: 0.000000, bitrate: 1038 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1024x512 [SAR 1:1 DAR 2:1], 894 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 265 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler