[mythtvnz] Channel change stability issues with MythTV and VDPAU in NZ

[Steven Ellis]

On 1/06/2009, at 5:49 PM, Jean-Yves Avenard wrote:

> Hi
>
> 2009/6/1 Steven Ellis <steven at openmedia.co.nz>:
>> It appears that Jean thinks the issue may reside in the version of  
>> ffmpeg
>> that 0.21-fixes is based on.
>> Steve
>
> It doesn't "appear" :)
>
> It crashed there:
> #0  0xb7047cc5 in decode_slice_header (h=0xa396d600, h0=0xa396d600) at
> h264.c:3834
>
> There you find:
>            h->prev_frame_num++;
>            h->prev_frame_num %= 1<<h->sps.log2_max_frame_num;
>            s->current_picture_ptr->frame_num= h->prev_frame_num;
> <---- crash here
>            execute_ref_pic_marking(h, NULL, 0);
>
> the crash occurs because is s->current_picture_ptr is NULL ... This
> should never happened ...
>
> Looking at the more recent ffmpeg, even if that code there has been
> removed, it still assumes later than s->current_picture_ptr is
> defined. So I'm guessing the crash you produced would have happened as
> well, just not in the same area of the code.


Thanks for clarifying that. So any thoughts on why this value is NULL?

Steve


Steven Ellis - Technical Director
OpenMedia Limited
email   - steven at openmedia.co.nz
website - http://www.openmedia.co.nz

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.ourshack.com/pipermail/mythtvnz/attachments/20090601/6d11f7f0/attachment.htm