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<nigetilly>
hey quick question ....i download some free movies off youtube there from the 50s no copyright ...but my mothers TV doesnt support the format so i change it too mp4 and ac3 but the quailty drops massive anything i can do ?
<another|>
what codec is it in?
<aaabbb>
nigetilly: if the movies from youtube are h264, then you can do a stream copy to not transcode anything
<aaabbb>
it doesn't work with all resolutions/bitrates etc
<aaabbb>
if that works, then try it with "main" instead of "baseline" because that will be higher quality per bit
<aaabbb>
most good quality h264 uses profile "high", but that's not always supported on older hardware. "main" is more likely to be supported, and "baseline" will definitely be supported if h264 is
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<nigetilly>
ok
<nigetilly>
thanks so much
<nigetilly>
that makes life alot easier know that
<nigetilly>
knowing
<aaabbb>
you can also use -crf and then a number to tweak the quality/size tradeoff
<aaabbb>
the default is 23, which is the same as if you do "-crf 23". a lower crf is higher quality, but bigger file size
<aaabbb>
and you can also increase quality by using -preset, the default is medium aka "-preset medium". if you have some time on your hands, you can set it to "-preset veryslow" which takes longer to convert, but gives you better quality without increasing the file size much
<nigetilly>
oh ok
<nigetilly>
how would that look
<aaabbb>
so i'd suggest something like "ffmpeg -i input.mp4 -c:v libx264 -profile:v baseline -preset veryslow -crf 20 -c:a ac3 output.mp4"
<nigetilly>
ok
<aaabbb>
if the quality isn't good enough, you can decrease crf to 19 or even 18. if the file size is too big, you can increase the crf. usually you'll want it somewhere between 15 and 30 (roughly speaking), with lower meaning big file with high quality and higher meaning small file with worse quality
<nigetilly>
yep yep
<nigetilly>
ill do some testing now
<nigetilly>
see what it comes out with
<nigetilly>
:P
<nigetilly>
so that line is saying ..video mp4 copy to video libx264 the profile goin to be baseline the present is going to be veryslow for better quality and the crf down to 20 from better quality and the audio going to be ac3
<aaabbb>
yeah, well it won't copy it it will convert it to the baseline profile (which means features that are sometimes incompatible, like cabac, are turned off), using the veryslow preset (which means it takes longer to convert but the quality is btter) with the crf down from 23 to 20 (meaning better quality at the expense of file size), and the audio will be converted to ac3 with default settings, and it will be
<aaabbb>
put into a .mp4 file
<nigetilly>
yep yep
<nigetilly>
what about if ya happy with the video format
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<jokoon>
I use ffmpeg.exe -f image2 -framerate 2 -i C:\_chest2\creations\calvin\croppedby2\%02d.png -vcodec libx264 -pix_fmt yuv420p calvin.mp4
<jokoon>
on 13 PNGs
<jokoon>
wait, no, 2.5 instead of 2
<jokoon>
does that mean the last image will show about (2.5/13) seconds, or will it just be the last frame?
<jokoon>
wait my math is bad
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<jokoon>
VLC is weird on windows when dealing with start/end of video, it seems to cut off too early
<jokoon>
firefox doesn't
<jokoon>
Not sure if that's me
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<CounterPillow>
The mpeg-4 container does not standardise what should be done with the last frame of a video iirc, so what is done depends on the player
<jokoon>
I duplicated PNG to avoid this, so I have 15 PNG instead of 13, with ./ffmpeg.exe -f image2 -framerate 2.6 -i C:\_chest2\creations\calvin\croppedby2\%02d.png -pix_fmt yuv420p calvin15.mp4 so it goes under 6s for whatsapp
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<arseru>
Hi there! Could anyone point me to a good guide on how to rip DVDs to h265 using only ffmpeg on linux?