[vlc-devel] libswscale logo overlay crash on Win32

Måns Rullgård mans at mansr.com
Sun Apr 5 16:15:12 CEST 2009


xxcv <xxcv07 at gmail.com> writes:

> Jean-Baptiste Kempf wrote:
>> Hello,
>>
>> On Fri, Apr 03, 2009 at 06:25:53PM -0430, Tom Maneiro wrote :
>>
>>> I've just updated to the latest VLC 0.9.9, just to find that it
>>> crashes when i try to use a logo overlay over the video. The picture
>>> used was a transparent, alpha-channel PNG, and at first i thinked in
>>> that old libpng-related bug on early 0.9.x releases... so i tried
>>> switching libpng_plugin.dll with the one from 0.9.8a. No luck! The
>>> crash was still there.
>>>
>>
>> I did update libswscale with the rest of FFmpeg for 0.9.9.
>>
>> I didn't find any crash in avcodec (contrary to the previous contribs),
>> but I didn't check swscale.
>>
>>
>>> - using libswscale_plugin.dll from previous VLC release (0.9.8a) WORKS
>>> (no crashes, logo overlay works as expected)
>>>
>> So the regression is indeed in the newer swscale version.
>>
>>
>>> - using libswscale_plugin.dll from latest VLC nightly (03/04/2009)
>>> FAILS (same memcpy crash)
>>>
>>
>>   Expected. It uses the same swscale version.
>>
>>   Does it happen with other filters?
>>
>>
> Problem with ffmpeg see https://trac.videolan.org/vlc/ticket/2585#comment:2
> Unlikely it will be fixed soon

Has this problem been reported to the FFmpeg developers?  If not, it
will indeed not be fixed soon.  That trac ticket isn't particularly
helpful to us.

-- 
Måns Rullgård
mans at mansr.com




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