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

[rfischer56 at gmail.com]

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




-----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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