On Thu, May 22, 2025 at 8:22 PM Mark Filipak <markfilipak.i...@gmail.com> wrote:
> On 22/05/2025 16.07, Paul B Mahol wrote: > > On Thu, May 22, 2025 at 8:01 PM Mark Filipak <markfilipak.i...@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 > > Thank you, Mr. Mahol. 'acl2cl' is not documented. But I will try it. > > The try will likely fail because 'librempeg' appears to be lacking in Mr. > Doshi's builds. Hopefully, > I'm wrong about that. > There is windows librempeg build on github fork. If you use github search you can easily find it (if you have github account). You can use similar/same with pan filter in ffmpeg: ffmpeg -i input.m2ts -af "pan=5.1|FL=FL|FR=FR|FC=FC|LFE=LFE|BL=BL|BR=BR" output.ac3 why this is not the default with aresample/aformat in FFmpeg is strange. > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
