[FFmpeg-user] h265 output bigger than h264 input, how to level the both quality to make h265 smaller than h264

[Micael Silva]

Em sex., 6 de jan. de 2023 às 10:30, Ricardo Henrique <
ricardohenrique1 at outlook.com> escreveu:

> Hello FFMpeg team, well I'm using FFMpeg to change the encode from h264 to
> h265 and works fine for most of files, but some files has the output file
> (h265) bigger than input file (h264), what is the reason for this to
> happen? I know that there is a process to transcode h264 to raw (or close)
> then encode to h265 (right?), so I imagine that the h265 output in this
> case has a much higher visual quality (bitrate, ...) than the input h264
> right? Is there a way to "level" the video quality of the h264 input file
> with the h265 output file so that the output file is not larger than the
> input file?
>
> I'm using FFMpeg like that:
>
> for %%a in (*.mkv, *.mp4) do (
>     ffmpeg -i "%%a" -map 0 -c:a copy -c:s copy -c:v libx265 -vtag hvc1
> -crf 18 -preset medium -tune animation "Out\%%~na.mkv"
> )
>
> Thanks!!


-crf tries do do a visual representation, depending of visual
characteristics of the original file (color, speed of motion) it can
translates to a different final bitrate

>