[FFmpeg-trac] #658(avcodec:open): auto-select yuv420p for RGB inputs with libx264

[FFmpeg]

#658: auto-select yuv420p for RGB inputs with libx264
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             Reporter:  llogan       |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by llogan):

 Does a private option make more sense than just setting an appropriate
 pix_fmt to preserve RGB? With x264 I believe "--output-csp rgb" keeps RGB:
 {{{
 $ x264 rgb24.png --output-csp rgb -o output.h264
 Using network protocols without global network initialization. Please use
 avformat_network_init(), this will become mandatory later.
 Using network protocols without global network initialization. Please use
 avformat_network_init(), this will become mandatory later.
 lavf [info]: 1000x1000p 0:1 @ 25/1 fps (vfr)
 x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle
 SSE4.2
 x264 [info]: profile High 4:4:4 Predictive, level 3.2, 4:4:4 8-bit
 x264 [info]: frame I:1     Avg QP:26.66  size: 11440
 x264 [info]: mb I  I16..4: 84.3% 10.3%  5.4%
 x264 [info]: 8x8 transform intra:10.3%
 x264 [info]: coded y,u,v intra: 2.8% 2.8% 4.1%
 x264 [info]: i16 v,h,dc,p: 80% 20%  0%  0%
 x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  5%  5% 90%  0%  0%  0%  0%
 0%  0%
 x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 44% 26% 19%  1%  2%  2%  2%
 2%  2%
 x264 [info]: kb/s:2288.00

 encoded 1 frames, 20.00 fps, 2288.00 kb/s
 }}}

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/658#comment:2>
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