[FFmpeg-user] Quality Reduced when Burning Subtitles

Paul B Mahol onemda at gmail.com
Sat Sep 11 18:54:00 EEST 2021

Next time set option for overlay filter.

On Sat, Sep 11, 2021 at 5:47 PM Veronica & Stephen McGuckin <
VSMcGuckin at outlook.com> wrote:

> Hello,
> I am trying to overlay pgs subtitles onto a 4K video. I have extracted 10
> minute to make sure I have the correct ffmpeg coding. The input file is 5.6
> gigabytes with a bit rate of 78.6 Mb/s. I am using the following ffmpeg
> commands.
> ffmpeg -i c:\video\input.mkv -filter_complex “[0:v][0:s]overlay[v]” -c:v
> libx265 -pix_fmt yuv420p10le -profile:v high  -x265-params “-crf=10 -film
> -hdr10+=1 -preset slow” -map “[v]” -map 0:a:0 -c:a copy c:\video\output.mkv
> When the conversion is complete the output file is 143 mb with a bit rate
> of 279 b/s. I am surprised the output file is so small. I would have
> expected it to be also around 5 Gb. I am concerned that I will have lost
> some of the quality. Have I somehow got the wrong parameters?
> I have attached a word document which provides the console output. I have
> also attached a screen shot showing the file data as reported by Mediainfo.
> Any advice would be appreciated.
> Regards
> Stephen
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