[FFmpeg-soc] Segmentation Fault when using -vfilters "movie ...; overlay"

[Brandon Mintern]

On Thu, Mar 25, 2010 at 9:25 PM, Stefano Sabatini
<stefano.sabatini-lala at poste.it> wrote:
> On date Thursday 2010-03-25 20:15:27 -0400, Brandon Mintern encoded:
>> I am trying to overlay a transparent PNG (using alpha blending) of size 800x600
>> on an 11-second wmv file of size 800x600. In doing so, I get a Segmentation
>> Fault immediately after the "Press [q] to stop encoding" message comes up.
>>
>> I already filed a bug at https://roundup.ffmpeg.org/issue1841 but
>> cehoyos (the only responder thus far) said, "Imo, problems with a
>> patch from the soc repository should be reported to the ffmpeg-soc
>> mailing list."
>>
>> I'll provide here all of the information that I have provided so far
>> in my bug report.
>>
>> The command I executed:
>>
>> ffmpeg -y -i intro-base.wmv -vfilters "movie=0:png:title-overlay.png [title];
>> [in][title] overlay=0:0:1 [out]" -vcodec wmv2 intro-title.wmv
>>
>> I have tried it both with and without the "[out]", with no change. When I omit
>> all -vfilters stuff, the command works fine, so I'm quite sure the segfault is
>> happening as a result of the libavfilter operations.
>>
>> My libavfilter info:
>>
>> $ svn info libavfilter
>> Path: libavfilter
>> URL: svn://svn.ffmpeg.org/soc/libavfilter
>> Repository Root: svn://svn.ffmpeg.org/soc
>> Repository UUID: 66570020-b32e-0410-962d-e44e8f9afd43
>> Revision: 5717
>> Node Kind: directory
>> Schedule: normal
>> Last Changed Author: stefano
>> Last Changed Rev: 5717
>> Last Changed Date: 2010-03-24 19:25:00 -0400 (Wed, 24 Mar 2010)
>>
>> To build ffmpeg with libavfilter, I followed this process:
>> http://ubuntuforums.org/showthread.php?t=1438052 (skip down to "Updating to
>> latest..." for a quick look at how I'm doing it). I wrote that guide yesterday;
>> it's quite possible I'm making a mistake in the build process.
> [...]
>> If there's anything else I can provide to help this along, I'd be happy to do
>> so. I can upload the 2 sample files somewhere if that will be of assistance.
>
> Can you reproduce the same crash also with ffplay -vfilters "..." (I
> cannot). Did you tried with other files or the crash only happens with
> that particular file?
>
> In the last case yes, uploading the files somewhere may be of help.
>
> Regards.
> _______________________________________________
> FFmpeg-soc mailing list
> FFmpeg-soc at mplayerhq.hu
> https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-soc
>

Here's what ffplay gives me:

$ ffplay -vfilters "movie=0:png:title-overlay.png [title]; [in][title]
overlay=0:0:1" intro-base.wmv
FFplay version SVN-r22626, Copyright (c) 2003-2010 the FFmpeg developers
  built on Mar 25 2010 02:46:11 with gcc 4.4.1
  configuration: --enable-gpl --enable-version3 --enable-nonfree
--enable-postproc --enable-pthreads --enable-libfaac --enable-libfaad
--enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libx264 --enable-libxvid
--enable-x11grab --enable-avfilter --enable-avfilter-lavf
--enable-debug
  libavutil     50.12. 0 / 50.12. 0
  libavcodec    52.59. 0 / 52.59. 0
  libavformat   52.56. 1 / 52.56. 1
  libavdevice   52. 2. 0 / 52. 2. 0
  libavfilter    1.18. 0 /  1.18. 0
  libswscale     0.10. 0 /  0.10. 0
  libpostproc   51. 2. 0 / 51. 2. 0
[wmv3 @ 0xa3f9150]Extra data: 8 bits left, value: 0
Input #0, asf, from 'intro-base.wmv':
  Metadata:
    title           : GS-IntroV2
    author          :
    copyright       :
    comment         :
    WMFSDKVersion   : 11.0.5721.5145
    WMFSDKNeeded    : 0.0.0.0000
    IsVBR           : 1
    VBR Peak        : 240
    Buffer Average  : 716
  Duration: 00:00:11.33, start: 5.000000, bitrate: 409 kb/s
    Stream #0.0(eng): Audio: wmav2, 44100 Hz, 1 channels, s16, 48 kb/s
    Stream #0.1(eng): Video: wmv3, yuv420p, 800x600, 343 kb/s, 15 tbr,
1k tbn, 1k tbc
[wmv3 @ 0xa3f9150]Extra data: 8 bits left, value: 0
[overlay @ 0xa538810]auto-inserting filter 'auto-inserted scaler 0'
between the filter 'Parsed filter 0' and the filter 'Parsed filter 1'
[scale @ 0xa53b9a0]w:800 h:600 fmt:yuva420p
  16.33 A-V:-1269576481.385 s:0.0 aq=    0KB vq= 4657KB sq=    0B f=0/0

It just seems to run indefinitely without ever playing anything. The
bottom line is displaying what it showed when I suspended it after it
ran for about 10 minutes or so. The number after A-V continues to
constantly grow (get more negative?) and vq constantly grows as well.

The files (title-overlay.png and intro-base.wmv) are now hosted at
http://bmintern.homeunix.com/~brandon/samples/

Thanks,
Brandon