use more cpu consuming preset (like slow, slower, you can try use
graphic encode like nvenc for speed up), increase crf to 22-26, use
noise reduction (like hqdn3d), try better codec (like libx265)
W dniu 2017-04-03 o 09:01, Cecil Westerhof pisze:
I made Saturday some videos of a contest, but they are a ‘little’ to
big to be published. For example a video of not seven minutes is
1.2 GB.
I first worked with statements like (the audio needed to be increased also):
ffmpeg -y -i ${file}.MP4 -vcodec libx264 -crf 20 -af volume=3
${file}AudioInc.MP4
This brought back the size back to 377 MB, but took almost 2 hours to
process.
So I tried:
ffmpeg -y -i ${file}.MP4 -vcodec libx264 -crf 20 -af volume=3 -preset
ultrafast ${file}AudioInc.MP4
That only took ten minutes, but increased the size to 956 MB.
Is there a way to decrease the size significantly, that does not take
to much time and still keeps a good quality? (By accident I went from
-crf 18 to -crf 120 instead of -crf 20. That was a very small file,
but very blocky.) They would like me to bring the size back to about
150 MB.
Info from the input file:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MVI_0980.MP4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp42avc1CAEP
copyright :
copyright-eng :
creation_time : 2017-04-01 15:11:55
Duration: 00:06:54.95, start: 0.000000, bitrate: 24054 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709), 1920x1080, 23919 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default)
Metadata:
creation_time : 2017-04-01 15:11:55
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 127 kb/s (default)
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