> On 19 May 2018, at 15:32, Moritz Barsnick <barsn...@gmx.net> wrote: > > On Sat, May 19, 2018 at 14:21:47 +0100, Onetel wrote: > >> I tried that as well but the output is just a duplicate of the DTS >> 96/24 stream, and has the same low volume problem as the original >> stream: > > That's interesting. I found a different sample, and ffmpeg indeed isn't > capable of "reducing" it. > > I was in doubt whether 96/24 was an extension, but at least Wikipedia > confirms: > "DTS 96/24 is implemented as a core DTS stream plus an extension > containing the deltas to enable 96/24 sound reproduction." I'm not sure > that means that the extensions need to be there, or whether they are > optional. > > If there are extensions in there, there seems to be a shortcoming in > ffmpeg's dca_core bitstream filter. > > BTW, if you use ffmpeg's decoder (and thereby re-encode, of course), it > does have the option: > -core_only <boolean> .D..A.... Decode core only without > extensions (default false) > > I haven't checked whether that works though... > > Cheers, > Moritz
To add re: the matter of whether the 96/24 extensions are separable from the core stream (and vice versa), it seems that this must be possible since legacy hardware still plays these streams as core DTS - I found this to be true with my aged Yamaha before getting a 7.1ch / HDMI replacement. So it seems the Wikipedia entry is correct. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".