[FFmpeg-user] a -vf for broadcast safe
Carl Eugen Hoyos
cehoyos at ag.or.at
Wed Dec 30 19:40:19 CET 2015
Dave Rice <dave <at> dericed.com> writes:
> Responding late, as I find myself in need of this
> filter as well.
Instead, please explain your real-world reason why
you need the filter:
Do you have input that does not conform to broadcast?
What does other "professional" software do with that
Or does FFmpeg take input that conforms and produces
output that does not conform? In this case you have
(likely) found a bug that we should try to fix...
> A sample that needs the filter can be generated via:
> ffmpeg -f lavfi -i color=gray:s=256x256
> -vf format=yuv444p,geq=lum=X,scale=out_range=tv
You created a formula that does not produce
tv range as output (as indicated by the pix_fmt)
but jpeg range. The scaler cannot know this, you
have to tell it:
> ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers
For future questions, please understand that only
current FFmpeg git head is supported on this
> built with Apple LLVM version 7.0.2 (clang-700.1.81)
> configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.4
> --enable-pthreads --enable-ffplay --enable-vda
These have no effect, please remove them.
> --enable-gpl --enable-version3 --enable-hardcoded-tables
> --enable-avresample --cc=clang
These should not be needed.
> --host-cflags= --host-ldflags=
These just make reading the configure line more difficult.
> --enable-opencl --enable-libx264 --enable-libmp3lame
This was never useful together with libfaac and is now
obsolete. (No runtime warning possible!)
This was never needed.
More information about the ffmpeg-user