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Bug 634830 - media-libs/mlt - melt segfaults with media-video/ffmpeg-3.4 during webm encoding
Summary: media-libs/mlt - melt segfaults with media-video/ffmpeg-3.4 during webm encoding
Status: RESOLVED TEST-REQUEST
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: AMD64 Linux
: Normal major
Assignee: Gentoo Media-video project
URL:
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Keywords:
Depends on:
Blocks:
 
Reported: 2017-10-19 22:52 UTC by Vincent Le Ligeour
Modified: 2018-11-29 23:24 UTC (History)
1 user (show)

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Runtime testing required: ---

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Description Vincent Le Ligeour 2017-10-19 22:52:45 UTC 
When rendering in kdenlive using webm (vpx) codec, melt is segfaulting in libavcodec library with the following backtrace:
  Thread 4 "melt" received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0x7fffca1bd700 (LWP 31135)]
  0x00007fffea2d748f in ?? () from /usr/lib64/libavcodec.so.57
  (gdb) where
  #0  0x00007fffea2d748f in ?? () from /usr/lib64/libavcodec.so.57
  #1  0x00007fffe9f81205 in avcodec_encode_audio2 () from 
  /usr/lib64/libavcodec.so.57
  #2  0x00007fffeb23565c in ?? () from /usr/lib64/mlt/libmltavformat.so
  #3  0x00007ffff798f8f7 in start_thread () from /lib64/libpthread.so.0
  #4  0x00007ffff76d1c7f in clone () from /lib64/libc.so.6

Only reverting ffmpeg to version 3.3.4 fixes the issue (video can be rendered).
Comment 1 Michael Palimaka (kensington) gentoo-dev 2017-11-19 06:49:30 UTC 
Which version of media-libs/mlt do you have installed?
Comment 2 Vincent Le Ligeour 2017-11-21 11:29:10 UTC 
(In reply to Michael Palimaka (kensington) from comment #1)
> Which version of media-libs/mlt do you have installed?

Still failing with the following setup:
- media-libs/mlt-6.4.1-r5::gentoo
- media-video/ffmpeg-3.4:0/55.57.57::gentoo
- kde-apps/kdenlive-9999:5::local

Reverting to media-video/ffmpeg-3.3.5:0/55.57.57::gentoo fix the issue
Comment 3 Vincent Le Ligeour 2018-02-19 08:15:40 UTC 
Process is still failing with the following versions:
- media-libs/mlt-6.4.1-r6
- media-video/ffmpeg-3.4.2:0/55.57.57
- kde-apps/kdenlive-9999

Reverting media-video/ffmpeg to version 3.3.6:0/55.57.57 make the problem disappaer.
Comment 4 John Dallahan 2018-03-02 15:42:27 UTC 
Can confirm this is still an issue with ffmpeg 3.4.2, mlt 6.4.1-r6 and kdenlive 17.12.2
Comment 5 Michael Palimaka (kensington) gentoo-dev 2018-03-02 23:03:46 UTC 
It's probably a bug in mlt/ffmpeg that should be reported upstream.
Comment 6 Michael Palimaka (kensington) gentoo-dev 2018-03-06 12:33:45 UTC 
mlt-6.6.0 is in tree containing assorted ffmpeg fixes upstream, I haven't tested with ffmpeg-3.4 though
Comment 7 Andreas Sturmlechner gentoo-dev 2018-10-01 18:11:33 UTC 
Please test with:
media-libs/mlt-6.10.0
kde-apps/kdenlive-18.08.1