Am 15.09.2022 um 11:01 schrieb Paul B Mahol:
On 9/15/22, Michael Koch <astroelectro...@t-online.de> wrote:
Am 15.09.2022 um 00:30 schrieb Paul B Mahol:
On 9/15/22, Dan <twinbe...@skytopia.com> wrote:
zscale=...,format=yuv420p
Ohhhh.... okay. I tried that before (except using two -vf commands),
because
I
suspected you might've meant that.
Just tried it again, still no luck. Let me know if I need to tweak
anything:
ffmpeg.exe -f lavfi -i color=0x19be0f:s=400x578 -crf 0 -vcodec libx264
-vf
zscale=w=-1:h=-1,format=yuv420p -t 5 -y "578.mp4"
I'm using Media Player Classic to test the colours, which breaks the pic
using the 578 pixel
height. Chrome actually works with both the 576 and 578 pixel height, but
as
soon as I
change the height to 984, then both Media Player Classic AND Chrome show
it
broken.
Datascope shows the strange and seemingly unrelated 78,4C,44 values for
all
three sizes,
but it does that even without using zscale at all.
Good, we move forward, that are real values encoded in bitstream.
Anything RGB values you complain about have nothing directly related
about ffmpeg.
Also make sure that all software are reinterpreting your files correctly.
The files need to signal correct encoded colorspace/primaries/range/etc
so
it can be correctly displayed on screen.
Below is a Windows batch file for reproducing with FFplay. I did use the
latest version from Gyan. The color difference is clearly visible.
Looks like you had hard time understanding text you quoted above.
ffmpeg -f lavfi -i color=0x19be0f:s=400x576 -vf
zscale,setrange=full,format=yuv420p -colorspace bt709 -color_primaries
bt709 -crf 0 -vcodec libx264 -t 5 -y out1.mp4
ffmpeg -f lavfi -i color=0x19be0f:s=400x578 -vf
zscale,setrange=full,format=yuv420p -colorspace bt709 -color_primaries
bt709 -crf 0 -vcodec libx264 -t 5 -y out2.mp4
start ffplay -left 0 -top 0 out1.mp4
start ffplay -left 400 -top 0 out2.mp4
When inspecting the files with FFprobe or ExifTool, I see no differences
except height and small differences in bitrate and filesize.
ffplay is broken/buggy and should not be used here, it will display
differently stuff
all the time, and uses SDL library by default for video output.
Using datascope filter it clearly shows pixels are exactly same.
You are right that datascope shows no difference. But the issue is also
reproducible with VLC player.
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