PCM in MPEG-TS

[Guest]

Hi all,

PCM 48KHz stereo it's only a steam with 1536kpbs. Why VLC isn't supporting s16l (PCM) audio codec with the TS MUX?

I think that this is a very important feature for streaming high quality audio over LAN!

Anyone interested?

[h2g2bob]

First are you recieving or sending a stream?
And how are you doing this?

The page http://www.videolan.org/streaming/features.html tells you what you can (and can't) put in the ts mux - if you're sending the stream, you might want to transcode the audio into mpga format.

[Guest]

Sure! I know the features of VLC, but I think that LPCM audio needs to be supported in the MPEG-TS. Now, AC3 is supported, also DTS (not included in the table), but not LPCM. This type of audio can be inserted in a TS as private_stream, like in a VOB (MPEG-PS).

Any "real" reason for not support it?

[The DJ]

reason:

1: no one needed it so far, so no reason for such a theoretically existing person to develop it.
2: no one is bored enough


(this refers to the way development of VLC usuallly goes. Someone needs a feature, adds the feature, and contributes back the code ).

[Guest]

reason:

1: no one needed it so far, so no reason for such a theoretically existing person to develop it.
2: no one is bored enough

FALSE: I need it!

If you like to injet audio data from other machine to VLC for streaming with transcoding, you need PCM audio in the TS for INPUT.

[The DJ]

the whole line was:

1: no one needed it so far, so no reason for such a theoretically existing person to develop it.

Which implies that if you really need something, you will become the most likely person to actually go and develop it.
Since your questening implies that you are not a developer, and therefore cannot develop it, your request automatically ends up looking for developer type number 2. Someone who is bored enough (to get paid) and develop this FOR you.

[Guest]

Hi theDJ,

Excuse me, but I don't understand:

PCM is like RAW audio. TS are the UNIVERSAL transport mode in VideoLAN. VLC includes support for NON-STANDARD video codecs in MPEG-TS mode. Why you can't include a very simple "raw" audio in the Transport Stream? Moreover, knowing that several programs and hardware supports it (not officially, but as out-of-specs).

PCM audio it's only a stream of 1,5Mbps and very easy to support inside VLC.

Imagine this simple situation:

VLC-1 ---> VLC-99 ---> client
VLC-2 --------|
VLC-3 --------|

VLC-1, VLC-2 and VLC-3 are simple "capture" servers (any platform) with very low resources (you can use up to in order of hundreds), and they send the stream to VLC-99, a very powerful transcoder that streams only one input to the format desired by the client. The reasons for use PCM in TS are two:

1. No quality loss.
2. No resources loss in compression and decompression.

Remember that MPEG-TS is the UNIVERSAL transport mode in VideoLAN !

Thank you for your patience!