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

[Ryan Martell]

On Nov 29, 2006, at 10:00 AM, Benjamin Larsson wrote:

> Ryan Martell skrev:
>> On Nov 29, 2006, at 3:05 AM, Benjamin Larsson wrote:
>>> Ryan Martell skrev:
>>>> Hi--
>>>> So I'm working on some mms streaming stuff.
>>>> When I stream a file from an asx file, that's not live (but  
>>>> streamed via mms), it looks great.
>>>> When I play a live stream that's been encoded by the WM9  
>>>> encoder, there is a weird "drift" effect.  The I frames look  
>>>> great, and then after that, the changes seem to drift.  The  
>>>> colors then get out of whack slowly until the next I frame.
>>>> Has anyone seen this before (in a non-streaming solution?)?  I  
>>>> know I'm out on the bleeding edge with this, but thought someone  
>>>> might have an idea.  Are there known limitations to the wmv3  
>>>> decoder (options that I can disable on the encoder side?)
>>>> I don't really know enough about the codec to intelligently  
>>>> figure out what it's doing.
>>>> Thanks,
>>>> -Ryan
>>>
>>> Can you provide a sample?
>> Not sure; I'll see if i can use ffmpeg to convert it from a  
>> streaming to a wmv, and if that works, i'll see if it has the same  
>> problem.
>> The other option would be to get all the mms code in, and post the  
>> streaming url, but there's lots of code and it always takes awhile  
>> to get it all approved.
>> Thanks!
>> -R
>
> Dump a part of the stream with mplayer -dumpstream and see if you  
> get the same drift from the dumped file.

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?

Thanks!
-Ryan