Fieldmatch filter does not support high bit depth?

[nicol]

Summary of the bug: When I check the fmt from a high bit depth video using the fieldmatch filter and inverse telecine using the showinfo filter, it drops to 8 bits. the detelecine filter does not drop in bit depth.
The fieldmatch filter code seems to support high bit depth.

​https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/vf_fieldmatch.c#L925

How to reproduce:

% ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=1:r=24000/1001,format=yuv422p10le,telecine,fieldmatch,showinfo -vframes 1 -f null -
n:   0 pts:      0 pts_time:0       duration:      1 duration_time:0.0333667 fmt:yuv422p sar:1/1 s:1920x1080 i:P iskey:1 type:I checksum:E811F934 plane_checksum:[8D4631F3 B13FDB26 00E0EC0C] mean:[127 127 126] stdev:[56.0 79.8 84.3]
> fmt:yuv422p
 
ffmpeg -f lavfi -i testsrc2=s=1920x1080:d=1:r=24000/1001,format=yuv422p10le,telecine,detelecine,showinfo -vframes 1 -f null -
n:   0 pts:      0 pts_time:0       duration:      1 duration_time:0.0417083 fmt:yuv422p10le sar:1/1 s:1920x1080 i:P iskey:1 type:I checksum:61799E58 plane_checksum:[72E5ED53 5569CC33 BFE1E4B4] mean:[506 508 504] stdev:[223.8 319.2 337.1]
> fmt:yuv422p10le

ffmpeg version N-110972-gbaa9fccf8d-20230601
built on ... btbn Auto-Build 2023-06-01 12:47

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[Elon Musk]

High-bit formats are supported only by ppsrc=option.

As explained in documentation.

So you could use ppsrc and provide 2nd input to filter.