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• Convert M3U8 playlist to MP4 using GStreamer

  9 février 2023, par Idan

  I'm trying to convert an HLS playlist to MP4 file. The .ts files in the list are guaranteed to be h264/aac and with the same resolution (for cases when there is a EXT-X-DISCONTINUITY tag).

  



  this is the closes I got to a working pipeline :

  



  gst-launch-1.0 mp4mux name=mux ! filesink location=x.mp4 souphttpsrc location="https://remote/path/to/index.m3u8" ! decodebin name=decode ! videoconvert ! queue ! x264enc ! mux. decode. ! audioconvert ! avenc_aac ! mux.


  



  Don't really know if the result is valid as this command line gets GStreamer to play the HLS in playing time instead of fast forward and ingest as fast as possible (the list is closed with #EXT-X-ENDLIST).

  



  Second issue is that it looks to me like this pipeline is encoding the stream instead of just coping it. I don't need it to encode, only change the container. H264/aac in the .TS files is what I also need in the .MP4 file.

  



  So, is it possible to only copy and not transcode using as-fast-as-u-can ingestion and not real-life speed ?

  



  Basically, I am trying to find the GStreamer equivalent to this FFmpeg command :

  



  FFmpeg -i "https://remote/path/to/index.m3u8" -c copy x.mp4


  



  (I have to use GStreamer and not FFmpeg.)

  


• avformat : add subtitle support in master playlist m3u8

  29 mars 2020, par Limin Wang

  avformat : add subtitle support in master playlist m3u8
  Test with the following command for the webvtt subtitle :
  
  $ ./ffmpeg -y -i input_with_subtitle.mkv \
  
   -b:v:0 5250k -c:v h264 -pix_fmt yuv420p -profile:v main -level 4.1 \
  
   -b:a:0 256k \
  
   -c:s webvtt -c:a mp2 -ar 48000 -ac 2 -map 0:v -map 0:a:0 -map 0:s:0 \
  
   -f hls -var_stream_map "v:0,a:0,s:0,sgroup:subtitle" \
  
   -master_pl_name master.m3u8 -t 300 -hls_time 10 -hls_init_time 4 -hls_list_size \
  
   10 -master_pl_publish_rate 10  -hls_flags \
  
   delete_segments+discont_start+split_by_time ./tmp/video.m3u8
  Check the master m3u8 :
  
  $ cat tmp/master.m3u8
  
  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="subtitle",NAME="subtitle_0",DEFAULT=YES,URI="video_vtt.m3u8"
  
  #EXT-X-STREAM-INF:BANDWIDTH=6056600,RESOLUTION=1280x720,CODECS="avc1.4d4829,mp4a.40.33",SUBTITLES="subtitle"
  
  video.m3u8
  Check the result by convert to mkv :
  
  $ ./ffmpeg -strict experimental -i ./tmp/master.m3u8 -c:v copy -c:a mp2 -c:s srt ./test.mkv
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/dashenc.c
  • [DH] libavformat/hlsenc.c
  • [DH] libavformat/hlsplaylist.c
  • [DH] libavformat/hlsplaylist.h

• Create audio/video, audio only, and video only HLS playlist version of the same media file

  15 avril 2020, par Kevin Paek

  I have a media.mp4 file.

  



  Currently I convert it to an HLS playlist with this command :

  



  ffmpeg -y -i \
  "media.mp4" \
  -g 48 -sc_threshold 0 \
  -profile:v baseline -level:v 3.0 -pix_fmt yuv420p \
  -map 0:0 -map 0:1 -map 0:0 -map 0:1 \
  -map 0:0 -map 0:1 -map 0:0 -map 0:1 \
  -map 0:0 -map 0:1 -map 0:0 -map 0:1 \
  -c copy \
  -s:v:0 256x144   -c:v:0 libx264 -b:v:0 200k  -minrate:v:0 200k   -maxrate:v:0 200k   -bufsize:v:0 200k \
  -s:v:1 426x240   -c:v:1 libx264 -b:v:1 400k  -minrate:v:1 400k   -maxrate:v:1 400k   -bufsize:v:1 400k \
  -s:v:2 640x360   -c:v:2 libx264 -b:v:2 700k  -minrate:v:2 700k   -maxrate:v:2 700k   -bufsize:v:2 700k \
  -s:v:3 854x480   -c:v:3 libx264 -b:v:3 1280k -minrate:v:3 1280k  -maxrate:v:3 1280k  -bufsize:v:3 1280k \
  -s:v:4 1280x720  -c:v:4 libx264 -b:v:4 2560k -minrate:v:4 2560k  -maxrate:v:4 2560k  -bufsize:v:4 2560k \
  -s:v:5 1920x1080 -c:v:5 libx264 -b:v:5 5120k -minrate:v:5 5120k  -maxrate:v:5 5120k  -bufsize:v:5 5120k \
  -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2 v:3,a:3 v:4,a:4 v:5,a:5" \
  -master_pl_name "master.m3u8" \
  -f hls \
  -hls_playlist_type vod \
  -hls_time 5 \
  -hls_list_size 0 \
  -hls_flags split_by_time+round_durations \
  -start_number 1 \
  -hls_segment_filename "av/%v/%02d.ts" \
  "av/%v/prog_index.m3u8"


  



  I can create audio only and video only version with the -an and -vn flags, but it would convert the file 3 times.

  



  Is there a way I can create all three versions with only 1 conversion ?

  



  I couldn't figure out a way to convert the resulting master.m3u8 into and audio only and video only version.
Also tried creating a converted_media.mp4 then using that to just copy the audio and video streams and just make the 3 playlists, but that didn't work either.

  



  Any help appreciated.