Am 29.12.25 um 09:51 schrieb Bouke / Videotoolshed via ffmpeg-user:
Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k
tbn, start 0.124000
The videos all ways have a non square pixel format.
Are there any special vf parameter to handle this pixel format ?
Any ideas to improve it ?
(Beneath, its not a question for people who live in a lossless video world,
also to say h.265 is a lossy codec is wrong, crf 0 leads to a lossless result)
Bullshit. H.265 IS LOSSY. Not sure where it states that a value of 0 is
lossless, but at least all other values are lossy. (H 264 says that the best
quality is ‘visually lossless’, that means not technically lossless.)
I’ve told you before to omit the noise reduction and the de-interlacing. So you
do listen and have omitted the de-interlacing, but if you add noise reduction,
not even a lossless codec will give you an ‘identical’ file.
How could it if you re-arrange pixels?
So test without the NR, and do not only trust testing software, but look/trust
your eyes. No matter what Netflix says. (I know Netflix, they have a gazillion
quality standards and they sometimes sell horrible stuff that would never have
made it outside my studio walls.)
For the aspect, there is a filter to set the pixel format, or scale to a
non-square pixel format.
Now I’m going to make it way more complex. If the origin is SD video, you also
need to crop as SD was an over scanned format, so the edges were never intended
to be seen on the screen. (Hence you often can see a mic dipping in the image.
This is NOT a mistake of the sound guy / boom operator, it shows his quality
that he gets as close as possible without being in the active image.)
Bouke
Thanks
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As written by Bouke : "Bullshit. H.265 IS LOSSY ...the best quality is ‘visually
lossless’... but look/trust your eyes. " ?????
So, is there a question in here I’m missing?
Was something I said unclear? Did you toy around already with the suggestions I
gave you? And have posted the output of FFmpeg as others have requested?
That all is less work than you seem to put in writing mails.
We can’t help you if you don’t try to help yourself.
Bouke
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Refer to https://trac.ffmpeg.org/wiki/Encode/H.265#Losslessencoding
Lossless encoding
Use the |-x265-params lossless=1| option. Adding |-crf 0| is not required.
You can verify lossless encoding by looking for |x265 [info]: lossless
compression ratio| in the console output from your encoding command, or
refer to the hash demuxer <https://ffmpeg.org/ffmpeg-formats.html#hash>
for verification.
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