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• ffmpeg hls muxer is missing codec info in master playlist when codecs are copied from input

  21 septembre 2021, par dogan

  ffmpeg hls muxer has the option to set master playlist but the created playlist is missing the important codec information.

  


  Example :

  


  ffmpeg -hide_banner -i <input /> -c copy -f hls -master_pl_name master.m3u8  stream.m3u8&#xA;

  


  Expected :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=77595,RESOLUTION=1280x720,CODECS="avc1.64001f,mp4a.40.2"
stream.m3u8


  


  Instead I get this

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=77595,RESOLUTION=1280x720
stream.m3u8


  


  Is there a way to make ffmpeg set the codec info in playlist from the input source ? It works as expected if I encode the input using libx264 but I do not want to do any expensive encoding but copy the codecs from the input.

  


• Video append of 5656b failed for segment #2 in playlist Gstreamer RTSP to HLS

  28 juin 2021, par 55597

  I'm trying to forward an RTSP stream(video and audio) using GStreamer and stream it to HLS.

  


  Here is what I'm running on the RTSP server send :

  


      ./test-launch 'v4l2src device=/dev/video0 ! clockoverlay ! nvvidconv ! nvv4l2h264enc ! h264parse ! rtph264pay name=pay0 pt=96 alsasrc device="hw:2,0" ! voaacenc ! rtpmp4apay pt=97 name=pay1'


  


  The command I'm trying to use to receive is :

  


      gst-launch-1.0 rtspsrc location=rtsp://127.0.0.1:8554/test name=rtspsrchls ! queue ! rtph264depay ! h264parse ! mpegtsmux name=mux ! hlssink location="/home/nano128/tdservice/hls_rtsp/public/segment%05d.ts" playlist-location=/home/nano128/tdservice/hls_rtsp/public/playlist.m3u8 target-duration=20 max-files=5 rtspsrchls. ! queue ! rtpmp4adepay ! aacparse ! audio/mpeg ! mux.


  


  The HLS stream starts and I am able to see it on my browser. But I get these errors on the browser.

  


  video append of 5656b failed for segment #2 in playlist


  


  When I try to play the segment0.ts on vlc it is playing properly but when I l play sement1.ts I hear only audio.

  


  What is wrong with my GStreamer command ?

  


• How to add a subtitle to an HLS playlist using FFmpeg ?

  24 mai 2021, par Arad

  I have a video (video.mp4) and a subtitle file (subtitle.srt).

  


  I'm trying to use FFmpeg to generate a VoD HLS playlist with 3 different resolutions for the video ; and I also want the subtitle file to turn into segmented .vtt files.

  


  I've tried the following command, but it doesn't work, it gives me a "Conversion failed !" message without any further information :

  


  ffmpeg -i video.mp4 -i subtitle.srt \
-preset slow -g 60 -sc_threshold 0 \
-map 0 -map 0 -map 0 -map 1 \
-s:v:0 640x360 -c:v:0 h264 -b:v:0 500k \
-s:v:1 854x480 -c:v:1 h264 -b:v:1 1000k \
-s:v:2 1280x720 -c:v:2 h264 -b:v:2 2000K \
-c:a copy -c:s webvtt \
-f hls -hls_playlist_type vod -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" \
-master_pl_name master.m3u8 -hls_time 6 -hls_list_size 0 -hls_allow_cache 1 -start_number 1 \
-hls_segment_filename "output/hls/%v/seg-%d.ts" output/hls/%v/index.m3u8


  


  I'm struggling to find any useful information in FFmpeg docs or anywhere else regarding how subtitles can be added to an HLS playlist. What should the command be like exactly ? What am I missing in mine ?