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• HLS with FFmpeg, browser skips m3u8 in sequence

  16 octobre 2019, par Jongseok Yoon

  I’m writing a program with C++, receiving 2-second-long mp4 video and converting it to m3u8 and same-duration ts files in real-time.

  Problem is when I check it with browsers on PC, it doesn’t load m3u8 properly.

  For example, when I start to watch m3u8, it loads first m3u8 with #EXT-X-MEDIA-SEQUENCE : 1, then it keeps loading first m3u8, then suddenly skips to #EXT-X-MEDIA-SEQUENCE : 4 or larger.

  Streaming still works, but it is very unstable due to that problem. It loads some ts together, then loads nothing while loading same m3u8 it already loaded, and skips 3 or more m3u8 and loads ts files together and again.

  ffmpeg -loglevel level+warning -i SOURCE.mp4 -an -filter:v fps=fps=10 -f hls -hls_list_size 7 -strftime 1 -hls_segment_filename '1.ts' -hls_flags append_list+omit_endlist DEST.m3u8

  This is ffmpeg command in my program, using hls_segment_filename option to overwrite ts files so I limit number of files under 100, and it runs every 2 second.

  Maybe, I’m overwriting it too fast to be loaded ?

• Passing file name in youtube-dl post-process script without file extension suffix

  2 avril 2021, par Arete

  The documentation for youtube-dl says I can run a post-process command with the --exec option.

  


  Using Windows, here is an example I have tried :

  


  youtube-dl --exec "ffmpeg -i {} -ac 2 -c:a libfdk_aac -cutoff 20000 -afterburner 1 -vbr 0 {}.m4a" https://www.youtube.com/watch?v=sw9DlMNnpPM


  


  Note that {} passes the file name to the post-process command. For example filename.webm.

  


  The problem is that {} includes the file extension.

  


  How can I pass the file name to the post-process command without the file extension ?

  


  For example, if I were to convert the video, I would rather avoid getting an output name like filename.webm.m4a. Needless to say, I would rather want filename.m4a.

  


• Covert a file from mp4 to a file that HTML video tag can display

  26 juin 2019, par Trying_To_Understand

  I have a mp4 file and I want to display it in HTML. The problem is that it won’t, not only in HTML but also in my player. In VLC I can watch the video but there is no sound. Maybe the file is corrupted ?
  This is the output when I run ffmpeg -i my_file.mp4 :

  [h264 @ 000001b4afc61880] decode_slice_header error
  
  [h264 @ 000001b4afc61880] no frame!
  
  [h264 @ 000001b4afc61880] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 000001b4afc61880] decode_slice_header error
  
  [h264 @ 000001b4afc61880] no frame!
  
  Input #0, mpeg, from '150_2.mp4':
  
    Duration: 00:50:51.75, start: 13182.386222, bitrate: 983 kb/s
  
      Stream #0:0[0x1e0]: Video: h264 (High), yuv420p(progressive), 1280x720, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x1c0]: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
  
  At least one output file must be specified.

  Can I convert this with ffmpeg to a good quality of video and audio ?