[Ffmpeg-devel] question: wmv3 codec image "drifts"

[Benjamin Larsson]

Ryan Martell wrote:

>
> On Dec 1, 2006, at 12:00 AM, Kostya wrote:
>
>> On Wed, Nov 29, 2006 at 05:12:44PM -0600, Ryan Martell wrote:
>>
>>>
>> [...]
>>
>>>
>>> I have provided a sample at:
>>>
>>> /MPlayer/incoming/DriftingWMV9
>>>
>>> The audio doesn't sync, but that's a different issue I'm sure.
>>>
>>> I don't think this is my mms problem, because mplayer has the same
>>> problem (using a different mms library).
>>>
>>> Any thoughts?
>>
>>
>> Your sample is encoded with WMV3 Simple Profile and VC-1 standard
>> says maximum picture size for SP is 320x240, your file has a bit
>> greater dimensions. When I hack extradata to treat file as Main  Profile
>> reference decoder does decode it but also not without glitches.
>> I'll see what can be done and what's wrong with motion compensation.
>
>
> Thanks Kostya.
>
> Here are the settings for Windows Media Encoder for that stream:
>
> Compression Tab
> Audio encoding mode: CBR
> Video encoding mode: CBR
>
> Audience: 299.96Kbps
> Audio codec: Windows Media Audio 9.1
> Audio format: 32kbps, 44kHz, stereo, CBR
> Video codec: Windows Media Video 9
> Video bit rate: 259 Kbps
> Video size: 448 x 336
> Frame rate: 29.97 fps
> Key frame: 10 s
> Image quality: 99
> Buffer size: 5 s
>
> Video Size Tab:
> Output: 448 x 336
> Aspect Ratio
> Output: 1.33: 1
> Alignment:
> Width: 2
> Height: 2
>
> Again, it IS being encoded by the standard Windows Media Encoder, but 
> of course, a M$ stream that doesn't conform to the specification 
> doesn't surprise me. ;-)
>
> Let me know if there's anything I can do to help,


Kostya did fix some issues with the vc-1 decoder, can you update and see
if it fixed your sample ?

>
> Thanks,
> -Ryan


MvH
Benjamin Larsson

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