[FFmpeg-user] Quality Reduced when Burning Subtitles

[Veronica & Stephen McGuckin]

Thank you. Please can you explain a little bit more about what option I should set.

Regards

-----Original Message-----
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Paul B Mahol
Sent: 11 September 2021 16:54
To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
Subject: Re: [FFmpeg-user] Quality Reduced when Burning Subtitles

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 
> -hdr10+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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