[FFmpeg-user] Supported pix_fmts for decoders using -h decoder

[Kieran O Leary]

Hi,

I was wondering if there was a reason why supported pix_fmts are
rarely seen when calling `ffmpeg -h decoder=$codec`. I did a quick
audit and it looks like pix_fmts are declared in the help section of
some decoders (see below), but for the most part it is left out.
One benefit that I could see would be that it would allow scripts to
check if an installed version of ffmpeg can decode a pixel format that
might have been added recently, rather than just catching the errors.

Would this be of any benefit, and would patches be welcome?


Decoder flashsv [Flash Screen Video v1]:
    General capabilities: dr1
    Threading capabilities: none
    Supported pixel formats: bgr24
Decoder flashsv2 [Flash Screen Video v2]:
    General capabilities: dr1
    Threading capabilities: none
    Supported pixel formats: bgr24
--
Decoder flv [FLV / Sorenson Spark / Sorenson H.263 (Flash Video)]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
--
Decoder h263 [H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2]:
    General capabilities: horizband dr1 trunc delay
    Threading capabilities: none
    Supported pixel formats: vaapi_vld vdpau yuv420p
Decoder h263i [Intel H.263]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder h263p [H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2]:
    General capabilities: horizband dr1 trunc delay
    Threading capabilities: none
    Supported pixel formats: vaapi_vld vdpau yuv420p
--
Decoder mpeg4 [MPEG-4 part 2]:
    General capabilities: horizband dr1 trunc delay threads
    Threading capabilities: frame
    Supported pixel formats: vaapi_vld vdpau yuv420p
--
Decoder msmpeg4v1 [MPEG-4 part 2 Microsoft variant version 1]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder msmpeg4v2 [MPEG-4 part 2 Microsoft variant version 2]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder msmpeg4 [MPEG-4 part 2 Microsoft variant version 3]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
--
Decoder rv10 [RealVideo 1.0]:
    General capabilities: dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder rv20 [RealVideo 2.0]:
    General capabilities: dr1 delay
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder rv30 [RealVideo 3.0]:
    General capabilities: dr1 delay threads
    Threading capabilities: frame
    Supported pixel formats: yuv420p
Decoder rv40 [RealVideo 4.0]:
    General capabilities: dr1 delay threads
    Threading capabilities: frame
    Supported pixel formats: yuv420p
--
Decoder svq1 [Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1]:
    General capabilities: dr1
    Threading capabilities: none
    Supported pixel formats: yuv410p
Decoder svq3 [Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3]:
    General capabilities: horizband dr1 delay
    Threading capabilities: none
    Supported pixel formats: yuvj420p
--
Decoder vc1 [SMPTE VC-1]:
    General capabilities: dr1 delay
    Threading capabilities: none
    Supported pixel formats: vaapi_vld vdpau yuv420p
Decoder vc1image [Windows Media Video 9 Image v2]:
    General capabilities: dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
--
Decoder wmv1 [Windows Media Video 7]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder wmv2 [Windows Media Video 8]:
    General capabilities: horizband dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
Decoder wmv3 [Windows Media Video 9]:
    General capabilities: dr1 delay
    Threading capabilities: none
    Supported pixel formats: vaapi_vld vdpau yuv420p
Decoder wmv3image [Windows Media Video 9 Image]:
    General capabilities: dr1
    Threading capabilities: none
    Supported pixel formats: yuv420p
--
Decoder xface [X-face image]:
    General capabilities: none
    Threading capabilities: none
    Supported pixel formats: monow