Summary:

 * Bad: LPCM audio is ignored in tsdemux plugin.

Description:

   Overview:
I am trying to play a mpeg ts file with h264 video and lcpm audio in it. But "mpegtsdemux" is ignoring the audio and source pad is created only for video. I added logs in "mpegtsdemux and tsdemux" and printed stream_id and stream_type for the same. It is stream_id=0xbd and stream_type=0x83.  

I saw in the tsdemux and mpegtsdemux source code that stream_type=0x83 is mapped to ST_BD_AUDIO_AC3_TRUE_HD and is not handled. But vlc is recognizing it as DVD lpcm audio. 


I used "dvbsnoop" ubuntu utility to analyze the stream. Below is what it says about audio section.(for one of the ts packets)

Sync-Byte 0x47: 71 (0x47)
Transport_error_indicator: 0 (0x00)  [= packet ok]
Payload_unit_start_indicator: 1 (0x01)  [= Packet data starts]
transport_priority: 0 (0x00)
PID: 68 (0x0044)  [= ]
transport_scrambling_control: 0 (0x00)  [= No scrambling of TS packet payload]
adaptation_field_control: 1 (0x01)  [= no adaptation_field, payload only]
continuity_counter: 0 (0x00)  [= (sequence ok)]
Payload: (len: 184)
     ==> PES-stream: 189 (0xbd)  [= private_stream_1] 

But "mpegtsdemux and tsdemux" src pad claims the it can candle "audio/x-private-ts-lpcm" and "audio/x-lpcm".


  SRC template: 'audio_%04x'
    Availability: Sometimes
    Capabilities:
      audio/mpeg
            mpegversion: 1
      audio/mpeg
            mpegversion: 4
          stream-format: adts
      audio/x-lpcm
                  width: { 16, 20, 24 }
                   rate: { 48000, 96000 }
               channels: [ 1, 8 ]
          dynamic_range: [ 0, 255 ]
               emphasis: { false, true }
                   mute: { false, true }
      audio/x-ac3
      audio/x-eac3
      audio/x-dts
      audio/x-private-ts-lpcm

I am using 0.10.22.3 version of gstreamer bad plugings but the issue is seen in 1.x also.

Steps to Reproduce:

Actual Results: 

  Only video pad is created and audio is ignored.

Expected Results:
  
  It should handle both audio(LPCM) and video as src pad capability says.

Platform:

  On ubuntu 12.04