[FFmpeg-user] mpeg4 with 4:2:2 colorspace
rhodri at kynesim.co.uk
Wed Jul 4 19:35:36 CEST 2012
[Top-posting edited to restore the flow of conversation.]
On Wed, 04 Jul 2012 18:12:15 +0100, farzaneh tabataba
<f.s.tabataba81 at gmail.com> wrote:
> On Wed, Jul 4, 2012 at 8:09 PM, Michael Bradshaw <
> mbradshaw at sorensonmedia.com> wrote:
>> On Wed, Jul 4, 2012 at 9:12 AM, farzaneh tabataba
>> <f.s.tabataba81 at gmail.com> wrote:
>> > Hi
>> > I am trying to encode an AVI file, via mpeg4 codec( with VBR qscale 1)
>> > My source file Chroma subsampling is: 4:2:2, while chroma subsampling
>> > the coded file is 4:2:0.
>> > How can I preserve the chroma subsampling ratio? I want it remains
>> > after compression.
>> I think MPEG-4 Part 2 only supports YUV420.
> Thanks michael, How can I become sure ?
You buy a copy of the ISO/IEC 14496-2:2004 standard, turn to page xiv of
the Introduction, and read the section headed "Chrominance formats". Or
you could trust us :-)
In fact MPEG-4 Part 2 Studio Profiles do support 4:2:2 and 4:4:4, but I'm
not aware of any decoders that understand those profiles.
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