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

Ron Barnes rbarnes at njdevils.net
Fri Nov 16 19:02:56 EET 2018


When I remove the -c copy - get an error.. subtitle encoding currently only possible from text to text or bitmap to bitmap.. then it just ends.

Any way to preserve the subtitles?


-----Original Message-----
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Paul B Mahol
Sent: Friday, November 16, 2018 9:02 AM
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] 4K Compression using x.265 issues

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" 

Remove: -c copy.
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