[FFmpeg-user] Calculate file size for lossless encoding

[Paul B Mahol]

On 10/1/23, Ulf Zibis <Ulf.Zibis at cosoco.de> wrote:
> Hi,
>
> I used the following command on a 155 minute grabbing:
>
> ffmpeg -video_size 1680x888 -framerate 25 -f x11grab -i :0.0+0,81 -c:v
> libx264rgb -crf 0 -preset ultrafast output.mkv
>
> Assuming, the RGB range is 8 + 8 + 8 bit or 3 byte, I calculate:
>
> 3 x 25 x 60 x 155 x 1680 x 888 = 1040.6 GByte
>
> But the file is only 93.7 GByte.
>
> How can that be ?

Encoder was specified. Lossless encoders can still compress data.

>
> -Ulf
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