[FFmpeg-trac] #6520(avformat:new): MP4 muxer has continuously increasing memory usage

FFmpeg trac at avcodec.org
Tue Jul 11 14:24:20 EEST 2017

#6520: MP4 muxer has continuously increasing memory usage
             Reporter:  Sesse     |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  3.2.4
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |

 I'm muxing MP4 streams with -movflags
 empty_moov+frag_keyframe+default_base_moof -frag_duration 125000. It seems
 that memory usage is very slowly but surely increasing, by roughly 15
 MB/day until I close the stream.

 tcmalloc heap profiling seems to indicate that the culprit is the mov
 muxer. In particular, mov_add_tfra_entries() allocates a MOVFragmentInfo
 struct for each fragment, and never seems to clear them; 36 bytes every
 125 ms is 25 MB/day, so it matches pretty well.

 Is there a way to avoid this allocation? Given that this is a stream and
 not a file, I don't see how one needs to know about every fragment that
 has ever been output.

Ticket URL: <https://trac.ffmpeg.org/ticket/6520>
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