On Thu, May 22, 2025 at 8:30 PM Paul B Mahol <one...@gmail.com> wrote:
> > > 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. > I know why this is happening, the channel layout type negotiation in libavfilter is sub-optimal there. > > >> _______________________________________________ >> 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".
