[mythtv-users] DTS Passthrough

mythtv mythtv at moasat.dyndns.org
Wed Jun 30 06:36:50 UTC 2010


> 
> If you play the file with mythfrontend or mythavtest with the log
> comment -v audio,playback you would probably get some information
> about what's going on.
> 
> If DTS was decoded or not, with AC3 re-encoded or not etc.
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So, the relevant log info is:

2010-06-30 01:32:19.446 AFD: Trying to select audio track (w/lang)
2010-06-30 01:32:19.446 AFD: Selected track 2: English DCA 5.1ch (A/V Stream
#2)
2010-06-30 01:32:19.446 AFD: Initializing audio parms from audio track #2
2010-06-30 01:32:19.446 AFD: Audio format changed 
                        from id(NONE)    -1Hz -1ch   0bps    to id( DTS)
48000Hz  6ch  16bps   
2010-06-30 01:32:19.452 AO: Reencoding decoded AC3/DTS to AC3
2010-06-30 01:32:19.452 AO: Killing AudioOutputDSP
2010-06-30 01:32:19.452 AO: Original audio codec was DTS
2010-06-30 01:32:19.452 AudioOutputALSA::GetSupportedRates opening iec958:{
AES0 0x02 }
2010-06-30 01:32:19.464 AO: Sample rate 44100 is supported
2010-06-30 01:32:19.464 AO: Sample rate 48000 is supported
2010-06-30 01:32:19.464 AO: Sample rate 96000 is supported
2010-06-30 01:32:19.464 AO: Creating AC-3 Encoder
2010-06-30 01:32:19.464 DEnc: Init codecid=AC3, br=448000, sr=48000, ch=6
2010-06-30 01:32:19.466 DigitalEncoder::Init fs=1536, bpf=12 ofb=18432
2010-06-30 01:32:19.466 Opening audio device 'spdif'. ch 2(6) sr 48000
(reenc 1)
2010-06-30 01:32:19.466 Setting IEC958 status: non-audio
2010-06-30 01:32:19.467 Opening ALSA audio device 'iec958:{ AES0 0x02 }'.
2010-06-30 01:32:19.469 in SetParameters(format=2, channels=2, rate=48000,
buffer_time=400000, period_time=25000)
2010-06-30 01:32:19.470 get_buffer_size returned 16384
2010-06-30 01:32:19.470 set_period_time_near returned 21333
2010-06-30 01:32:19.470 get_period_size returned 1024
2010-06-30 01:32:19.481 Setting  volume to 100
2010-06-30 01:32:19.481 Setting  volume to 100
2010-06-30 01:32:19.481 AO: Audio fragment size: 6144
2010-06-30 01:32:19.481 AO: Audio Stretch Factor: 1
2010-06-30 01:32:19.482 AO: Ending reconfigure

I see that what I assumed is correct, it is re-encoding the DTS to AC3.
Unfortunately, it doesn't really help me to know that.  Can you tell from
this output why it would think it has to re-encode instead of just sending
the DTS to the receiver?



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