[FFmpeg-trac] #4875(undetermined:new): Hangs up during convertion with libx264 to mp4 container

FFmpeg trac at avcodec.org
Wed Sep 23 15:38:13 CEST 2015

#4875: Hangs up during convertion with libx264 to mp4 container
             Reporter:  maxvgi       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  git-master   |  undetermined
             Keywords:  deadlock     |               Resolution:
  regression                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by maxvgi):

 I have compiled current sources from git.

 {{{-vcodec mpeg4 -qscale 2}}} leads to the same problem.

 I have uploaded the sample video to

 Fresh ffmpeg reports and console output are attached.

 gdb backtrace:

 #0  pthread_cond_wait@@GLIBC_2.3.2 () at
 #1  0x00007ffff6568373 in ?? () from
 #2  0x00007ffff6509ce2 in ?? () from
 #3  0x00007ffff665d78c in avcodec_encode_video2 () from
 #4  0x000000000041fac6 in do_video_out (s=0x63ae00,
 ost=ost at entry=0x63b940, next_picture=next_picture at entry=0x1f348c0,
 sync_ipts=<optimized out>) at ffmpeg.c:1191
 #5  0x0000000000420dc6 in reap_filters (flush=0, flush at entry=6535488) at
 #6  0x0000000000426c7a in transcode_step () at ffmpeg.c:3931
 #7  transcode () at ffmpeg.c:3974
 #8  0x0000000000408bf8 in main (argc=<optimized out>, argv=0x7fffffffead8)
 at ffmpeg.c:4157

 Use the following command to reproduce the bug:
 ffmpeg -i hang_up_during_convertion_to_mp4.mp4 -vcodec mpeg4 -qscale 2

Ticket URL: <https://trac.ffmpeg.org/ticket/4875#comment:3>
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