On Mon, Feb 20, 2012 at 12:11 PM, Dan Dennedy <d...@dennedy.org> wrote:
> 2012/2/17 Maksym Veremeyenko <ve...@m1stereo.tv>:
>> 16.02.12 18:56, Dan Dennedy написав(ла):
>>
>>> 2012/2/16 Maksym Veremeyenko<ve...@m1stereo.tv>:
>>>>
>>>> 02.02.12 19:03, Maksym Veremeyenko написав(ла):
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>>
>>>>> i am trying to decrease cpu usage, so i would like to use
>>>>> PIX_FMT_YUVA420P animation instead of PIX_FMT_BGRA (or other rgb with
>>>>> alpha channel) but has no luck..
>>>>>
>>>>> video with such pixel format in *nut* container has detected by ffmpeg
>>>>> properly, but mlt did not use it alpha channel.
>>>>>
>>>>> i can provide a sample if required...
>>>>>
>>>>
>>>> alpha been ignored for PIX_FMT_YUVA420P and PIX_FMT_YUVA444P pixel
>>>> format.
>>>> moreover current implementation of libswscale drop alpha channel if
>>>> destination format has no alpha and not planar (even if buffer specified)
>>>>
>>>> attached patch extract alpha plane during image decoding. it works almost
>>>> fine except moments when image fetched from cache (even if *noimagecache*
>>>> specified). another problem is artifact that appear if last frame in
>>>> movie
>>>> is not transparent but producer specifies *out* out of animation.
>>>>
>>>> another attempt to fix this was to fix mlt_frame_clone (patch attached)
>>>> but
>>>> it has no luck too...
>>>
>>>
>>> OK, thank you for the start of this effort. I will look at it this
>>> weekend.
>>>
>>
>> attached updated version that works with cache.
>>
>> second patch is optional but could be usefull if frame with alpha been
>> cloned.
>
> These look great, but I had to fix some minor formatting problems. We
> tend to prefer C++ style comments in .c files (but not headers). Also,
> some spacing around parenthesis. Sometimes I am OK to make these fixes
> myself, which I have done here in my local repo. Now I just need to
> figure out why this does not work:
>
> melt -profile atsc_1080i_50 noise: -track
> ~/Videos/tests/now-main_aut_2011_fullHD.nut -transition composite

Your nut file had an opaque alpha channel. I recreated it from the
rgba avi file, and it works, so I pushed it.

+-DRD-+

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