[FFmpeg-devel] [PATCH] Fix interlaced MPEG2 decoder crash (issue2367)

Michael Niedermayer michaelni
Thu Dec 23 16:33:42 CET 2010

On Thu, Dec 23, 2010 at 11:19:55AM +0300, Anatoly Nenashev wrote:
> On 23.12.2010 03:36, Michael Niedermayer wrote:
>> On Thu, Dec 23, 2010 at 02:16:21AM +0300, Anatoly Nenashev wrote:
>>> Hi!
>>> Full problem description available on https://roundup.ffmpeg.org/issue2367.
>>> After some research I've found that sample file(exploit.bin) conflicts
>>> with specification in the following lines:
>> is anything capable of playing this file?
>> or is it a damaged file?
>> how has this file been created exactly?
> Sample file is truncated version of the original file which has been  
> grabbed from Optelecom Siqura C-60.
> I've left only two first pictures to minimize the problem. Original  
> sample uploaded to  
> ftp://upload.ffmpeg.org/MPlayer/incoming/interlaced_mpeg2/interlaced_mpeg2.bin
> It can be successfully decoded by libmpeg2 tools. By the way, libmpeg2  
> reports errors for exploit.bin and returns no frame but don't crash.

This does not awnser my question.
Is this file valid or is it damaged?
Or worded differently, is there a matching player from the manufactor whos
hardware generated this file which is then capable of displaying something
for this frame?

If something can play this file then the patch is 100% wrong
if nothing can play this file then the patch is still wrong because you drop
the previous I field that has been decoded correctly.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
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