[FFmpeg-devel] [PATCH]Add two v4l2 pix_fmts

[Paul B Mahol]

On 2/16/13, Stefano Sabatini <stefasab at gmail.com> wrote:
> On date Saturday 2013-02-16 01:02:20 +0100, Stefano Sabatini encoded:
>> On date Tuesday 2013-02-12 00:45:52 +0000, Carl Eugen Hoyos encoded:
>> > Stefano Sabatini <stefasab <at> gmail.com> writes:
>> >
>> > > >      if (desired_format == V4L2_PIX_FMT_YVU420)
>> > > >          st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
>> > > > +    else if (desired_format == V4L2_PIX_FMT_YVU410)
>> > > > +        st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9');
>> > >
>> > > why these exceptions?
>> >
>> > They are needed both for decoding and remuxing YVU*.
>>
>> Yes but why do they need to set a specific tag (as opposed to the
>> other formats), or in other works why are they special?
>
> Also note that this is not meant to block the patch, but an
> explanation would be welcome.

Because swscale lack interleaved/packed yuv pixel formats where U and V are
swapped.

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