[FFmpeg-devel] [WIP] New Filter (dejudder)

[Timothy Gu]

On Jan 24, 2014 10:50 AM, "Nicholas Robbins" <nickrobbins at yahoo.com> wrote:
>
> > On Friday, January 24, 2014 5:02 AM, Paul B Mahol <onemda at gmail.com>
wrote:
>
> >>  detected 2 logical cores
> >>  [AVFilterGraph @ 0x2744dac9f0] Error initializing filter 'dejudder'
> >>  Error opening filters!
> >>  [AVIOContext @ 0x2744db0be0] Statistics: 0 seeks, 0 writeouts
> >>  [AVIOContext @ 0x2744db0cc0] Statistics: 32768 bytes read, 0 seeks
> >>
> >>  I'm not sure how to debug this.
> >
> > Wrong check for malloc failure in init function.
>
>
> Thanks! That did it. I think I have it working now. However, I get this
sometimes at the end of an otherwise fine encode like
>
> $ ffmpeg  -i IN.mkv  -map 0 -c copy -c:v libx264 -preset veryfast -crf 17
-vf pullup,dejudder,fps=120000/1001 OUT.mkv
> ......
> [libx264 @ 0x51ed84a8e0] Weighted P-Frames: Y:2.5% UV:1.8%
> [libx264 @ 0x51ed84a8e0] kb/s:2383.61
> *** glibc detected *** ffmpeg: double free or corruption (!prev):
0x00000051ed847d80 ***
> ======= Backtrace: =========
> /lib64/libc.so.6(+0x7c0d6)[0x255120f00d6]
> /usr/lib64/libavutil.so.52(av_freep+0x20)[0x2551294fb80]
> /usr/lib64/libavfilter.so.4(+0x4eb72)[0x255147c8b72]
> /usr/lib64/libavfilter.so.4(avfilter_free+0x8b)[0x255147c9f1b]
> /usr/lib64/libavfilter.so.4(avfilter_graph_free+0x34)[0x255147cb404]
> ffmpeg(+0x21d3b)[0x51eb945d3b]
> ffmpeg(+0xdee5)[0x51eb931ee5]
> ffmpeg(main+0x353)[0x51eb92fe33]
> /lib64/libc.so.6(__libc_start_main+0xf5)[0x25512098965]
> ffmpeg(+0xc91d)[0x51eb93091d]
> ======= Memory map: ========
> 51eb924000-51eb957000 r-xp 00000000 08:03 806949
/usr/bin/ffmpeg
> 51ebb56000-51ebb59000 r--p 00032000 08:03 806949
/usr/bin/ffmpeg
> ....
> 25514eab000-25514eac000 rw-p 00022000 08:03 262537
/lib64/ld-2.16.so
> 25514eac000-25514ead000 rw-p 00000000 00:00 0
> 384f2f62000-384f2f84000 rw-p 00000000 00:00 0
[stack]
> ffffffffff600000-ffffffffff601000 r--p 00000000 00:00 0
[vsyscall]
> Aborted
>
> What is causing that? I've attached new patch.

May or may not be related: try to use av_malloc() or av_mallocz() instead
of malloc()

Also try to debug this in gdb.