[mythtv-users] MythTV Raspberry Pi2 frontend testers

[Lawrence Rust]

On Fri, 2016-01-01 at 13:24 +1100, rob e wrote:
> hi Lawrence,
> happy new year :)

Hi Rob,

Hope you have a good new year too.  My head is just beginning to recover
now!

> I've conducted some more testing, and generated log files
> 
> Test clips (notes for repeatability),
> - MPEG2 TV stream at SD stereo (big bang theory)
> - MPEG2 TV stream at "HD" ac3  (brokeback)
> - h264 with dts (this is the end)
> - h264 3d with dts (captain america)
> 
> This Pi has licences for mpeg2 and wvc1, installed and verified. It's 
> also using an edid file to force 1080p video
> 
> When audio set to -
> 1) OpenMax-HDMI Stereo, no AC3 no DTS 
> (mythtv_log_openmax_hdmi_01_stereo_160101.log)
>        Both tv clips fail to play audio

The first clip (1007_20151231093000.mpg) appears to have no problems
recorded in the log with OpenMAX hdmi audio.  So I'm a bit baffled.  Do
you have to configure the receiver to work in basic PCM mode?  Maybe it
expects pass through data by default.

I note that the OpenMAX video decoder is not being used - it looks like
there is a problem with your video playback profile.  I would suggest
that you check the decoder setting in your OpenMAX profile.  Or maybe
delete and re-create the profile.

In the 2nd clip (1090_20140202205000.mpg) the audio is AC3, 32-bit
floating point.  Querying the OpenMAX audio component for supported
formats it reports that is supports 32-bit PCM samples.  As such the
audio player passes the 32-bit data straight to the OpenMAX driver.  But
it appears that OpenMAX can't play these samples.  This is clearly the
OpenMAX component overstating its capabilities.  Maybe the solution is
to only report support for 16-bit PCM.

It would be very helpful if you could upload a small 30 second sample of
the 2 recordings so I can examine them in more detail?

> 2) OpenMax-HDMI 5.1, no AC3 no DTS 
> (mythtv_log_openmax_hdmi_02_51_160101.log)
>        Both tv clips fail to play audio

Similar to above.  The OpenMAX component is being configured with 6
channels OK but apparently doesn't play back.

> 3) OpenMax-HDMI 5.1, with AC3 with DTS 
> (mythtv_log_openmax_hdmi_03_51_ac3dts_160101.log)
>        SD tv stereo clip fails to play audio
>        HD tv ac3 5.1 clip audio plays ok !!

Again the 1st clip has no reported problems in the log.

The 2nd clip appears to be configured for passthrough OK, confirmed by
your listening test.

> 4) OpenMax-HDMI 5.1, with AC3 with DTS 
> (mythtv_log_openmax_hdmi_04_51_ac3dts_dtscontent_160101.log)
> 3d h264 video with DTS ... unwatchable and no sound (captain america)
>        HD h264 video with dts .... unwatchable ... but sound works !! 
> (this is the end)

I suspect that if you fix the problem with playback profile then the h/w
OpenMAX decoder will provide watchable content.  The audio has similar
problems to case 1,2 and 3.

Many thanks for your report.  It would be really useful if you could
upload the 2 short clips.  I'm sure that we can work around these
niggles and get OpenMAX audio working well across a range of material
and kit.

-- Lawrence Rust