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

[Jean-Yves Avenard]

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.

JY