Mailing List Archive: MythTV: Users

DTS-HD

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rhpot1991 at ubuntu

Feb 8, 2010, 9:06 PM

Post #1 of 11 (1084 views)
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DTS-HD

Is anyone successfully playing any videos with DTS-HD in .22? If I
downmix to 2 channel I get sound, but I'd really like to use my
surround sound. When using passthrough I don't get any sound on these
videos.
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callmegar at gmail

Feb 8, 2010, 9:45 PM

Post #2 of 11 (1043 views)
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Re: DTS-HD [In reply to]

As far as I know you cannot play DTS-HD, there's a patch from JYA that
could help, but I tried it and it doesn't work with all the DTS-HD
streams, it also downmixes to 5.1. DTS-HD cannot be passed through
because the Linux driver doesn't support it. What I do when trying to
keep the 7 channels is transcode DTS-HD into FLAC using eac3to and mux
the stream back to my content, this new track works pretty well on
linux.

On Mon, Feb 8, 2010 at 11:06 PM, John Baab <rhpot1991 [at] ubuntu> wrote:
> Is anyone successfully playing any videos with DTS-HD in .22? If I
> downmix to 2 channel I get sound, but I'd really like to use my
> surround sound. When using passthrough I don't get any sound on these
> videos.
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
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jyavenard at gmail

Feb 8, 2010, 10:30 PM

Post #3 of 11 (1036 views)
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Re: DTS-HD [In reply to]

On 9 February 2010 16:06, John Baab <rhpot1991 [at] ubuntu> wrote:
> Is anyone successfully playing any videos with DTS-HD in .22? If I
> downmix to 2 channel I get sound, but I'd really like to use my
> surround sound. When using passthrough I don't get any sound on these
> videos.

DTS-HD currently isn't well supported in ffmpeg, as such mythtv
doesn't support it either.

The patch I added a little while ago is used to downconvert 32 bits
audio tracks into 16 bits audio track... It wasn't specifically done
to play DTS-HD, Dolby Digital + etc...

Before myth can play the audio, it first needs to be decoded by ffmpeg.

There is a new ffmpeg sync around the corner, you can check on how
this is going...
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john.baab at gmail

Feb 8, 2010, 10:35 PM

Post #4 of 11 (1037 views)
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Re: DTS-HD [In reply to]

On Tue, Feb 9, 2010 at 1:30 AM, Jean-Yves Avenard <jyavenard [at] gmail> wrote:
> On 9 February 2010 16:06, John Baab <rhpot1991 [at] ubuntu> wrote:
>> Is anyone successfully playing any videos with DTS-HD in .22? If I
>> downmix to 2 channel I get sound, but I'd really like to use my
>> surround sound. When using passthrough I don't get any sound on these
>> videos.
>
> DTS-HD currently isn't well supported in ffmpeg, as such mythtv
> doesn't support it either.
>
> The patch I added a little while ago is used to downconvert 32 bits
> audio tracks into 16 bits audio track... It wasn't specifically done
> to play DTS-HD, Dolby Digital + etc...
>
> Before myth can play the audio, it first needs to be decoded by ffmpeg.
>
> There is a new ffmpeg sync around the corner, you can check on how
> this is going...
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

Is there a better option for playing these movies at this point? The
two that I have seen only seem to have the english track in DTS-HD.
Meanwhile the other language tracks are not in DTS-HD, but that
doesn't help me much.
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jyavenard at gmail

Feb 8, 2010, 11:10 PM

Post #5 of 11 (1038 views)
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Re: DTS-HD [In reply to]

On 9 February 2010 17:35, John Baab <john.baab [at] gmail> wrote:
> Is there a better option for playing these movies at this point? The
> two that I have seen only seem to have the english track in DTS-HD.
> Meanwhile the other language tracks are not in DTS-HD, but that
> doesn't help me much.

I'm not sure what your source of content is.

But if you are ripping blurays, the BD standard specifies that the
video must have a DD 5.1 track.

If you have no control on how the video is encoded, due to some...
hum... never mind where it comes from.

Then no, there's no much option for you at this time on Linux (or any
free (and even paid) application on other OS).
mplayer, xine, VLC all use libavcodec from ffmpeg, just like myth.
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nico at youplala

Feb 8, 2010, 11:18 PM

Post #6 of 11 (1036 views)
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Re: DTS-HD [In reply to]

On Tue, 2010-02-09 at 00:06 -0500, John Baab wrote:
> Is anyone successfully playing any videos with DTS-HD in .22? If I
> downmix to 2 channel I get sound, but I'd really like to use my
> surround sound. When using passthrough I don't get any sound on these
> videos.

Are you trying to pass-through DTS-HD through SP/DIF?

If you are, it won't fit, you need proper LDPCM sound and HDMI for
proper bandwidth.

An SP/DIF patch through HDMI won't cut it either.

Nico

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gzornetzer.lists at gmail

Feb 8, 2010, 11:42 PM

Post #7 of 11 (1037 views)
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Re: DTS-HD [In reply to]

On Mon, Feb 8, 2010 at 11:18 PM, Nicolas Will <nico [at] youplala> wrote:

> On Tue, 2010-02-09 at 00:06 -0500, John Baab wrote:
> > Is anyone successfully playing any videos with DTS-HD in .22? If I
> > downmix to 2 channel I get sound, but I'd really like to use my
> > surround sound. When using passthrough I don't get any sound on these
> > videos.
>
> Are you trying to pass-through DTS-HD through SP/DIF?
>
> If you are, it won't fit, you need proper LDPCM sound and HDMI for
> proper bandwidth.
>
> An SP/DIF patch through HDMI won't cut it either.
>
> As an alternative, it is possible to strip the DTS core (5.1 channel) out
of DTS-HD using eac3to or other tools. That DTS signal can be sent through
SPDIF to a receiver. Not as good as the full DTS-HD signal, but certainly
better than 2-channel audio.
-Greg

taylor.ralph at gmail

Feb 9, 2010, 6:47 AM

Post #8 of 11 (1021 views)
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Re: DTS-HD [In reply to]

On Tue, Feb 9, 2010 at 12:06 AM, John Baab <rhpot1991 [at] ubuntu> wrote:
> Is anyone successfully playing any videos with DTS-HD in .22? If I
> downmix to 2 channel I get sound, but I'd really like to use my
> surround sound. When using passthrough I don't get any sound on these
> videos.

You should be able to use passthru with DTS-HD tracks. The receiver
will ignore the DTS-HD portion and play the DTS core. However, you'll
need the following patch applied to 0.22-fixes:

http://svn.mythtv.org/trac/attachment/ticket/7409/t7409_mythtv_dts_skip_dts_hd_v3.diff

It has already been applied to trunk.

Give it a shot and let us know.

Regards.

--
Taylor
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taylor.ralph at gmail

Feb 9, 2010, 8:41 AM

Post #9 of 11 (1001 views)
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Re: DTS-HD [In reply to]

On Tue, Feb 9, 2010 at 9:47 AM, Taylor Ralph <taylor.ralph [at] gmail> wrote:
> On Tue, Feb 9, 2010 at 12:06 AM, John Baab <rhpot1991 [at] ubuntu> wrote:
>> Is anyone successfully playing any videos with DTS-HD in .22? If I
>> downmix to 2 channel I get sound, but I'd really like to use my
>> surround sound. When using passthrough I don't get any sound on these
>> videos.
>
> You should be able to use passthru with DTS-HD tracks. The receiver
> will ignore the DTS-HD portion and play the DTS core. However, you'll
> need the following patch applied to 0.22-fixes:
>
> http://svn.mythtv.org/trac/attachment/ticket/7409/t7409_mythtv_dts_skip_dts_hd_v3.diff
>
> It has already been applied to trunk.
>
> Give it a shot and let us know.
>

To clarify we filter the DTS core out using libavcodec not using your
receiver. At this time bit streaming DTS-HD using libav isn't possible
anyways. The bug in mythtv was that it tried to decode the DTS-HD
extensions which it doesn't support causing "bad" things to happen. So
yes you should be able to play a DTS-HD track in mythtv and it
passthru the DTS core to your reciever via SPDIF.

--
Taylor
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hansonorders at verizon

Feb 9, 2010, 1:42 PM

Post #10 of 11 (998 views)
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Re: DTS-HD [In reply to]

>You should be able to use passthru with DTS-HD tracks. The receiver
>will ignore the DTS-HD portion and play the DTS core. However, you'll
>need the following patch applied to 0.22-fixes:
>
>http://svn.mythtv.org/trac/attachment/ticket/7409/t7409_mythtv_dts_skip_dts_hd_v3.diff
>
>It has already been applied to trunk.
>
>Give it a shot and let us know.

This patch has been working very well for me for at least 6 weeks on 0.22-fixes. (mkv's with DTS-HD audio) Thanks for it.

Mike

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jyavenard at gmail

Feb 9, 2010, 2:11 PM

Post #11 of 11 (984 views)
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Re: DTS-HD [In reply to]

Hi

On 10 February 2010 08:42, M.A.E.M. Hanson <hansonorders [at] verizon> wrote:
>
> This patch has been working very well for me for at least 6 weeks on 0.22-fixes. (mkv's with DTS-HD audio) Thanks for it.
>

As I'm running trunk these days, I've kind of lost track (no pun
intended) of what's in 0.22 or not... I forgot about ignoring the
DTS-HD track mod...

But knowing that it doesn't work, I just never selected the DTS-HD
track to start with :)
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