On 01/04/2021 02:45 PM, pdr0 wrote:
Mark Filipak (ffmpeg) wrote
You wrote: "What's wrong with using setsar filter after tinterlace?"
I tried that from the git-go. I just reran it.
ffmpeg -report -i "source 720x480 [SAR 8x9 DAR 4x3] 29.97 fps.VOB"
-filter_complex "separatefields,
shuffleframes=0 1 2 4 3 6 5 7 8 9, split[Ain][Bin],
[Ain]select=not(eq(mod(n\,10)\,2)+eq(mod(n\,10)\,3)+eq(mod(n\,10)\,6)+eq(mod(n\,10)\,7))[Aout],
[Bin]select=eq(mod(n\,10)\,2)+eq(mod(n\,10)\,3)+eq(mod(n\,10)\,6)+eq(mod(n\,10)\,7),
tinterlace,
setsar=sar=8/9, bwdif=mode=send_field:deint=all, decimate=cycle=2[Bout],
[Aout][Bout]interleave,
tinterlace, setsar=sar=8/9, bwdif=mode=send_frame:deint=interlaced"
-codec:a copy -codec:s copy -dn
output.mkv
Putting setsar after tinterlace doesn't work. I did investigate that but I
can't recall why -- I
think it's because DAR is then wrong. The report is below.
You can't interleave images with different dimensions
Aout has separated fields, to 720x240 , but Bout is 720x480
[Bout] is 720x240: I'm using 'mode=send_field' in 'bwdif=mode=send_field', and the following
'decimate' doesn't change that. The problem is that 'tinterleave' is marking the output as "SAR =
16:9" instead of "8:9" (which is what it should be and should never be changed).
SAR cannot change unless DAR/PAR changes (which it doesn't). Look:
SAR = DAR/PAR = (8:3)/(720:240) = (8:3)/(6:2) = 8:9
SAR = DAR/PAR = (4:3)/(720:480) = (4:3)/(3:2) = 8:9
The current tinterlace filter is setting SAR = 16:9. That is just plain wrong.
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