[FFmpeg-user] Error decoding DTS-HD MA audio files

[Paul B Mahol]

On Fri, Aug 26, 2022 at 10:23 PM <rfischer56 at gmail.com> wrote:

> Thanks, Paul
> You are a genius. Your command worked with the two files I had sent you. I
> am now getting playback on the dCS Rossini from the beginning and (as far
> as I can hear) gapless playback between 4 and 5.
> However, I still have an inkling that not all is well
> I have attached the log of the two conversions that I did. Chapter 4 seems
> to convert ok with some messages but (as I see it) nothing serious. However
> Chapter 5 (the one that previously converted to 48kHz) has some serious
> error messages. Playback of the flac file seems ok.
> The dts file was extracted from the BluRay using DVDAE and the 'direct
> stream demux' option.  Ffmpeg has more issues with some extracted "dts
> files than with others. Could it be that the issue is already at the stage
> of the 'direct stream demux' option?
> As I am getting exactly the same results (same files extract @48kHz) using
> MakeMKV / MMH, there could be a problem at the ripping stage of the BluRay
> and not primarily with ffmpeg? What do you think?
> Best regards
> Rudi
>
>
I do not think it is ripping stage. It is how content was originally
produced.
I also noticed some strange error at end of chapter 5. So to be 100% sure
it is still ok, check for gapless between chapter 5 and 6 (if there is 6
chapter or whatever comes next).
There is very slight chance that there is no delay in any of dts files but
I doubt that because decoder follows specification 100% AFAIK.


>
>
>
> -----Original Message-----
> From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Paul B
> Mahol
> Sent: Friday, 26. August 2022 21:57
> To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>
> Subject: Re: [FFmpeg-user] Error decoding DTS-HD MA audio files
>
> On Fri, Aug 26, 2022 at 4:12 PM <rfischer56 at gmail.com> wrote:
>
> > Hello
> >
> > Am trying to extract DTS-HD MA audio files from the following Blu-Ray
> > (which I physically purchased)
> >
> > KARL RICHTER - J.S. Bach: Cantatas - Pure Audio Recordings <
> > https://pureaudiorecordings.com/en/product/karl-richter-j-s-bach-canta
> > tas/
> > >
> >
> >
> > I am getting the same result both with DVDAE and with MakeMKV / MMH
> > which I believe both use ffmpeg to extract DTS-HD MA. About 80% of the
> > tracks are correctly extracted to 24/192kHz files and around 20% of
> > the tracks are extracted to 24/48kHz files which play back at ¼ speed.
> > I then corrected the speed using
> >
> >
> >
> > ffmpeg -i 1.flac -af asetrate=192000 2.flac
> >
> >
> >
> > This now works on some of my playback equipment. However when I launch
> > playback of a converted file, it shows 0/192kHz for around 5 seconds
> > and only then locks to the 24/192kHz stream and plays back. This
> > happens with files that were correctly extracted to 192kHz and to
> > those that I had to speed up after the fact. So there seems to be
> > something fundamentally wrong with the ffmpeg extraction of this
> > BluRay
> >
> >
> >
> > I have prepared some sample files on one drive
> >
> > https://1drv.ms/u/s!AmpEbEYrlrk5lWGskTYvPp0iv4L3?e=U7kCRC
> >
> > Chapter 4 extracts correctly to 192kHz
> >
> > Chapter 5 extracts to 48kHz
> >
>
> The Chapter 5 file dts-hd-ma have certain delay. Thus you get with ffmpeg
> first few frames in only dts core at 48kHz 16bit and later full dts-hd-ma
> kicks in with 192kHz and 32bit, but because filtering is not supporting
> changing of sample rate and/or sample format at runtime all remaining
> frames are filtered back to 48kHz and 16bit. This is evident if you run
> ffmpeg with '-v debug'
> flag.
>
> Workaround is to force filtering at 192kHz and 32bit right at start with
> this command:
>
> ffmpeg -i Title1\ -\ Chapter\ 05.dts -af aformat=f=s32p:r=192000:cl=stereo
> out.flac
>
>
>
>
> >
> > Both flac extract to not play back correctly on dCS Rossini
> >
>
> Hardware playback of 24bit flac at 192000 Hz is not widely supported AFAIK.
>
>
> >
> >
> >
> > Could you please take a look at this? Thanks a lot
> >
> > Rudi
> >
> >
> >
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> >
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> >
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