[FFmpeg-trac] #7686(avfilter:new): Wrong decision of pixel format in filtergraph

[FFmpeg]

#7686: Wrong decision of pixel format in filtergraph
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             Reporter:  mfcc64      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by mfcc64):

 After investigating fate-run.sh, on pixfmts() actually the tested filter
 is guarded by format filter, so I try this:

 {{{
 % ffmpeg -loglevel verbose -filter_complex "allrgb=d=0.1,
 format=yuv444p12be, lutyuv, format=yuv444p12be" -f null -

 [Parsed_allrgb_0 @ 0x1e84440] size:4096x4096 rate:25/1 duration:0.100000
 sar:1/1
 [auto_scaler_0 @ 0x1f080c0] w:iw h:ih flags:'bilinear' interl:0
 [Parsed_format_1 @ 0x1e850c0] auto-inserting filter 'auto_scaler_0'
 between the filter 'Parsed_allrgb_0' and the filter 'Parsed_format_1'
 [auto_scaler_1 @ 0x1f096c0] w:iw h:ih flags:'bilinear' interl:0
 [Parsed_lutyuv_2 @ 0x1e85b00] auto-inserting filter 'auto_scaler_1'
 between the filter 'Parsed_format_1' and the filter 'Parsed_lutyuv_2'
 [auto_scaler_2 @ 0x1f0ad00] w:iw h:ih flags:'bilinear' interl:0
 [Parsed_format_3 @ 0x1e7fb40] auto-inserting filter 'auto_scaler_2'
 between the filter 'Parsed_lutyuv_2' and the filter 'Parsed_format_3'
 [auto_scaler_0 @ 0x1f080c0] w:4096 h:4096 fmt:rgb24 sar:1/1 -> w:4096
 h:4096 fmt:yuv444p12be sar:1/1 flags:0x2
 [auto_scaler_1 @ 0x1f096c0] w:4096 h:4096 fmt:yuv444p12be sar:1/1 ->
 w:4096 h:4096 fmt:yuv444p16le sar:1/1 flags:0x2
 [auto_scaler_2 @ 0x1f0ad00] w:4096 h:4096 fmt:yuv444p16le sar:1/1 ->
 w:4096 h:4096 fmt:yuv444p12be sar:1/1 flags:0x2

 }}}

 The result is unexpected: yuv444p12be -> yuv444p16le -> yuv444p12be.
 The ideal should be: yuv444p12be -> yuv444p12le -> yuv444p12be.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7686#comment:6>
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