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• Live streaming dash content using mp4box

  15 mai 2017, par galbarm

  I’m trying to live stream H.264 content to HTML5 using the media source extensions API.

  The following method works pretty well :

  ffmpeg -i rtsp://10.50.1.29/media/video1 -vcodec copy -f mp4 -reset_timestamps 1 -movflags frag_keyframe+empty_moov -loglevel quiet out.mp4

  and then :
  mp4box -dash 1000 -frag 1000 -frag-rap out.mp4

  I can take the MP4Box output (out_dashinit.mp4) and send it through Web Sockets, chunk by chunk, to a JavaScript client that feeds it to the media source API.

  However, this is not a good method for live content.

  What I’m trying to do now, is to create a single pipeline in order to do it in realtime and with the minimum possible latency.
  With FFmpeg it’s possible to redirect the output to stdout instead of out.mp4 and grab the content.
  I couldn’t figure out if it’s possible to combine MP4Box into the pipeline.

  1. Can MP4Box take the input data from a source which is not a file ?
  2. Can MP4Box grab such a content progressively (either from a file or other source) while it is arriving in realtime ? i.e. wait a little if stream stops for 1 sec and resume automatically.
  3. Same question but for the output : can it output to something which is not a file (such as stdout) and can it do so progressively so that whenever output data is ready, I will be able to take it and transfer it to the web client, essentially generating a never-ending dashed MP4.

• 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