[MPlayer-users] Dolby Surround detection

[Alexander Roalter]

On 29.05.2013 15:00, Carl Eugen Hoyos wrote:
> Alexander Roalter <alex <at> roalter.it> writes:
>
>> If a stereo channel contains Dolby Surround (4 channels),
>> the surround audio filter would come in.
>
>
> Could you provide such a sample?
> (I am not sure if we have one.)
>


I'll upload a short sample, but here's my findings:

Playing the stream #128 from the sample, I get

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 6 ch, s16le, 384.0 kbit/8.33% (ratio: 48000->576000)
Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
==========================================================================

Stream #137 (dts), I get

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 6 ch, s16le, 768.0 kbit/16.67% (ratio: 96000->576000)
Selected audio codec: [ffdca] afm: ffmpeg (FFmpeg DTS)
==========================================================================

Stream 130 (french, should be dolby surround) delivers

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
==========================================================================

and stream 131 (spanish, should be plain stereo)

==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
Selected audio codec: [ffac3] afm: ffmpeg (FFmpeg AC-3)
==========================================================================


The Sample was uploaded to upload.mplayerhq.hu, with the name
Platoon.DD51.DTS.DSurr.DD.AC.AC.vob:

It has 6 audio tracks:
audio stream: 0 format: ac3 (5.1) language: en aid: 128.
audio stream: 1 format: dts (5.1) language: en aid: 137.
audio stream: 2 format: ac3 (stereo) language: fr aid: 130.
audio stream: 3 format: ac3 (stereo) language: es aid: 131.
audio stream: 4 format: ac3 (stereo) language: en aid: 132.
audio stream: 5 format: ac3 (stereo) language: en aid: 133.

the last two are audio commentaries.


-- 
Cheers,
Alex