On Wed 11 Mar 2020 at 19:33:59 (+0300), Reco wrote: > On Wed, Mar 11, 2020 at 05:00:21PM +0100, Emanuel Berg wrote:
> > Stream #0:1(por): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s > > (default) > > Or this, dependent on your preferred language > > > Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s > > Is the likely source of your problem. > > This particular video has 5.1 audio, and you most probably have only two > audio channels to play it. > > If you're using mpv, you can try adding --audio-channels=stereo, but > (YMMV of course) I find its downmix lacking. > > Personally I just reencode audio in such cases. > For instance (0:1 is the first audio track, use 0:2 for english): > > ffmpeg -i ford-v-ferrari-2019.mkv -map 0:0 -map 0:1 \ > -c:v copy \ > -c:a libopus -b:a 128k -ac 2 -clev 1.414 -slev .5 \ > ford-v-ferrari-2019.good_audio.mkv That's a useful little recipe, and pleased the OP, but can you just clarify the arguments -clev 1.414 -slev .5 I get the impression that for resampling, the number should be in dB, whereas for downmixing (-center_mixlev and -surround_mixlev), they're scale factors, which is what yours look like). And how do you decide to resample rather than downmix? (being clueless at this stuff). Cheers, David.
