[FFmpeg-user] DTS 7.1 to AC3 5.1

[Paul B Mahol]

On Thu, May 22, 2025 at 8:01 PM Mark Filipak <markfilipak.imdb at gmail.com>
wrote:

> Hi, All,
>
> I've tried every trick in the documentation but I can't persuade FFmpeg
> CLI to convert DTS 7.1 to
> AC3 5.1.
>
> The best I get is AC3 5.0(side).
>
> Handbrake does it, and it uses the same libraries! I went ahead and made a
> minimal-resolution, MPEG2
> copy just to get at the AC3 5.1.
>
> Do you do DTS 7.1 to AC3 5.1 via FFmpeg? How do you do it?
>
>
>        silent = 3,214,906,938 bytes
> with DTS 7.1 = 8,623,235,367 bytes
> with AC3 5.1 = 3,968,811,052 bytes
>

Use librempeg instead:

ffmpeg -i 7_1.m2ts -af acl2cl=5.1 -vn x.ac3


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