[FFmpeg-user] Shrinking video files

[chronek]

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)
>