[FFmpeg-user] 4K Compression using x.265 issues

Paul B Mahol onemda at gmail.com
Fri Nov 16 16:01:43 EET 2018

On 11/16/18, Ron Barnes <rbarnes at njdevils.net> wrote:
> All,
> For some reason the below command is not working right.  I am unable to
> compress my movie by an significant amount.
> The input movie (MYMOVIE.Mkv) is just over 55GB and the resulting output is
> just over 53GB.
> I thought (and I am probably wrong) that by raising or lowering the -crf
> value would increase or decrease the size of my output file.  No matter what
> value I use, be it 18 or 28, the output file size is always the same.
> Can anyone determine where I'm going south in order to decrease the files's
> footprint (size) yet still preserve the movie quality?
> I want to take all the audio streams (only audio) and I am converting them
> to mp3 because I do not have a very good sound system and the actual 7.1
> audio stream sounds awful.
> ffmpeg -i "MYMOVIE.Mkv" -c:v libx265 -preset medium -map 0 -c:a:0 libmp3lame
> -b:a:0 128k -c copy -reserve_index_space 1000k -crf 28 -s 3840x2160 -b:v 10M
> -ac 2 -c:a aac -b:a 128k -metadata title="MYMOVIE" COMPRESSED_MYMOVIE.mkv

Remove: -c copy.

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