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• rtpdec_h264 : Use avpriv_report_missing_feature instead of a manual av_log

  29 avril 2016, par Martin Storsjö

  rtpdec_h264 : Use avpriv_report_missing_feature instead of a manual av_log
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/rtpdec_h264.c

• Manual audio sync with ffmpeg

  2 juin 2019, par Serg

  I have 2 inputs : video and audio. Both inputs are 287 sec delay.
  And audio has 10 second sync issue.

  what I want is shift audio either forward or back with 10 sec and always keep the video length.

  V -----------------

  A xxx-----------------

  OR

  V -----------------

  A --------------xxx

  for that I’m using :

  ffmpeg -y -i video_only.mp4 -i audio_only.aac -filter_complex "[1]adelay=10s|10s,asetpts=PTS-STARTPTS[a]" -map 0 -map [a] -c:v copy -t 287 out.mp4

  and

  ffmpeg -y -i video_only.mp4 -i audio_only.aac -filter_complex "[1]atrim=start=10,asetpts=PTS-STARTPTS[a]" -map 0 -map [a] -c:v copy -t 287 out.mp4

  Could you please recommend better way to do it ? For example in some cases audio could be longer than video file, and this is why I need to specify -t 287 all the time. Can I avoid -t if I use apad in conjunction with atrim and use -shortest or it’s not possible ? Because when I’m trying to do it, mixing process doesn’t stop even in hours...

  I also saw some examples with -ss and -itsoffset. Do they faster than atrim,adelay ? And most important part I need 100% accuracy.

  Thanks in advance !

• Why m3u8 file does not play well when i manual change m3u8 file

  27 mai 2022, par nancy

  I use ffmpeg to change mp4 to .ts

  


  ffmpeg -y -i [fileName].mp4 -vcodec copy  -vbsf h264_mp4toannexb [outPutFileName].ts


  


  And get the following index.m3u8 file

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:22
#EXTINF:21.804344,
out-0000.ts
#EXTINF:10.847822,
out-0001.ts
#EXTINF:12.239122,
out-0002.ts
#EXT-X-ENDLIST


  


  And then i use hls.js play this file

  


  It works fine

  


  But now i want to change this index.m3u8 file to this (copy this out02.ts twice, to repeat out02.ts)

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:YES
#EXT-X-TARGETDURATION:22
#EXTINF:21.804344,
out-0000.ts
#EXTINF:10.847822,
out-0001.ts
#EXTINF:12.239122,
out-0002.ts
#EXTINF:12.239122,
out-0002.ts
#EXTINF:12.239122,
out-0002.ts
#EXT-X-ENDLIST


  


  The result is this video play time change as expected

  


  but out02 does not repeat, when it play to end of first out02.ts, screen stuck at the begin of out00

  


  Why it does not work fine when i edit this file by myself ?
or i shoule use ffmpeg update this index.m3u8 file ?