[FFmpeg-devel] lavfi state of affairs

[Michael Niedermayer]

On Wed, May 06, 2009 at 10:31:54PM +0200, Vitor Sessak wrote:
> Michael Niedermayer wrote:
>> On Wed, May 06, 2009 at 08:46:58PM +0200, Vitor Sessak wrote:
>>> Michael Niedermayer wrote:
>>>> On Sun, Feb 08, 2009 at 07:10:22PM +0100, Vitor Sessak wrote:
>>>>> Michael Niedermayer wrote:
>>>>>> On Sun, Feb 08, 2009 at 01:39:02PM +0100, Vitor Sessak wrote:
>>>> [...]
>>>>>> could you please use unambigous command lines that do not depend on
>>>>>> automatcally inserted scale filters!
>>>>> ffmpeg -i in.avi -vfilters "format=rgb32, scale=256:256,format=rgb32, 
>>>>> fifo,slicify=32, format=yuv410p, fifo" out.avi
>>>> [...]
>>>>> [format @ 0x88b9170]auto-inserting filter 'scale'
>>>>> [format @ 0x88be990]auto-inserting filter 'scale'
>>>>> [fifo @ 0x88ef990]auto-inserting filter 'scale'
>>> It do not _depends_ on auto-inserted filters, but I understand what you 
>>> mean:
>> good so lets restart the questions
>> 1. does this problem depend on the used scaler / bitexact / accurate
>> 2. does it also happen when actual scaling is used?
>> 3. full output please (highest verbosity and all the crap that sws can
>>    print)
>> and i know the awnsers to 1 & 2 where yes but there where 4 scalers,
>
> Indeed I either missed something or it was among one of Cedric's bug fixes. 
> For this example, either adding "bitexact" or doing scaling solves the 
> problem. For example:
>
> ffmpeg_g -an -i /tmp/levis.avi -vfilters 
> "slicify=32,scale=152:116:sws_flags=bilinear+bitexact" -pix_fmt yuv420p 
> -vcodec rawvideo -y /tmp/out.avi
>
> works fine. About the full output, the only additional line is
>
> [swscaler @ 0x8a1d330]using unscaled yuv410p -> yuv420p special converter

good, so next figure out in what case that is printed
hint: its yvu9toyv12Wrapper()
the function is just a few lines, the bug is obvious -> earn some karma
points fixing it


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I am the wisest man alive, for I know one thing, and that is that I know
nothing. -- Socrates
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