Am 26.12.25 um 11:58 schrieb Bouke / Videotoolshed via ffmpeg-user:
On 26 Dec 2025, at 11:53, Reindl Harald via ffmpeg-user<[email protected]>
wrote:
Am 26.12.25 um 11:49 schrieb Richard Bartczak via ffmpeg-user:
an example of your world, a non lossy video format video, from where you did get
that's not the topic
you have a H262 source and can't convert it to a more mordern codec without
more quality loss - it's the same when you have MP3 and want to convert your
library to opus - you would need the original WAV or at least FLAC sources to
do that without degradation
What I’m missing.
The OP uses -crf 20 IIRC.
Isn’t that a strange value for H265? (I never use H265 myself…)
I think the OP is complaining that the quality loss is ‘more than expected’.
Bouke
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Constant Rate Factor
(CRF)<https://trac.ffmpeg.org/wiki/Encode/H.265#ConstantRateFactorCRF>
Use this mode if you want to retain good visual quality and don't care
about the exact bitrate or filesize...
CRF affects the quality. The default is 28
For example:
ffmpeg -i input -c:v libx265 -crf 26 -preset fast -c:a aac -b:a 128k output.mp4
refer tohttps://trac.ffmpeg.org/wiki/Encode/H.265
-crf 0 is lossless, a hint for user who have no idea what crf does mean.
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