[FFmpeg-trac] #9510(avformat:new): HLS with fMP4 produces invalid segments

FFmpeg trac at avcodec.org
Mon Nov 15 09:31:44 EET 2021

#9510: HLS with fMP4 produces invalid segments
             Reporter:  Andreas      |                     Type:  defect
  Unterweger                         |
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  git-
             Keywords:  HLS hls      |  master
  CHUNK ffmpeg                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Using fMP4 segments with strftime and hls_init_time produces segments
 which are too short and cannot be played back.

 Example call:

 ./ffmpeg -y -i timer_1M.mp4 -acodec aac -b:a 64k -vcodec h264 -b:v 1M -f
 hls -hls_segment_type fmp4 -strftime 1 -hls_segment_filename '%%18d.m4s'
 -hls_flags second_level_segment_index+split_by_time -hls_time 0.6
 -hls_init_time 0.600001 index.m3u8

 This produces a segment 000000000000000006.m4s which is only about a tenth
 of the size of the other segments. Running FFprobe on it, it seems to
 contain only audio, but no video frames.

 Removing the hls_init_time parameter from the command "resolves" the
 issue, i.e., the segments are then split correctly and have video frames.
Ticket URL: <https://trac.ffmpeg.org/ticket/9510>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

More information about the FFmpeg-trac mailing list