FIXED: G.711 8khz stream
Posted: 09 Jun 2009 13:23
Hello,
My question isn't OS specific but I'll give you the details here just in case:
Server=Linux CentOS 5 with VLC 0.9.8a
Client=WinXP with VLC 0.8.6c
On the client I have an 8kHz mono 16 bit WAV file which I've proved plays correctly from the server's own soundcard using VLC's GUI. Hitting CTRL-I while the file is playing gives me this:
Next I close the GUI on the server (Linux, VLC 0.9.8a) and then use the following terminal command to start a G.711 8kHz ulaw stream over RTP:
On the client (WinXP, VLC 0.8.6c) I use File->Open Network Sream and select UDP/RTP on port 1234 but I hear nothing.
I have Wireshark running on the client and can see RTP packets arriving correctly. If I expand the "Real Time Transport Protocol" node of a received packet I can see:
So I think my sending stream is correct and it looks as if my receiving stream is correct yet WinXp VLC 0.8.6c doesn't play the incoming stream.
Any ideas? (I'll quickly point out that I've successfully streamed MP3 files using this setup; only the ulaw 8kHz attempt results in silence).
My question isn't OS specific but I'll give you the details here just in case:
Server=Linux CentOS 5 with VLC 0.9.8a
Client=WinXP with VLC 0.8.6c
On the client I have an 8kHz mono 16 bit WAV file which I've proved plays correctly from the server's own soundcard using VLC's GUI. Hitting CTRL-I while the file is playing gives me this:
Code: Select all
-stream 0
|-codec: araw
|-Language:
|-Type: Audio
|-Channels: 1
|-Sample rate: 8000 Hz
|-Bits per sample: 16
|-Bitrate: 128 kb/s
Code: Select all
cvlc file.wav --sout '#transcode{acodec=ulaw,rate=8000}:duplicate{dst=rtp{dst=192,168.0.2,port-audio=1234}}'
I have Wireshark running on the client and can see RTP packets arriving correctly. If I expand the "Real Time Transport Protocol" node of a received packet I can see:
Code: Select all
Real-Time Transport Protocol
[Stream setup by SDP (frame 2)]
10.. .... = Version: RFC 1889 Version (2)
..0. .... = Padding: False
...0 .... = Extension: False
.... 0000 = Contributing source identifiers count: 0
0... .... = Marker: False
Payload type: ITU-T G.711 PCMA (8)
Sequence number: 3
[Extended sequence number: 65539]
Timestamp: 480
Synchronization source identifier: 0xda3afed0 (3661299408)
Payload: (long hex value)
Any ideas? (I'll quickly point out that I've successfully streamed MP3 files using this setup; only the ulaw 8kHz attempt results in silence).
G.711 was introduced in VLC 0.9.x. Drop 0.9.9 onto the WinXP client and everything comes to life.