DIstorsion on RTP/PCM stream

[mcosta]

HI,

I'm developing an application sending, through RTP protocol, audio packets in PCM (8Khz 8bits).
Using VLC I read this stream but the audio has a distorsion.

I used wireshark to ensure that received packets contain correct data. (I tried with a single tone signal).
Can you help me to understand the origin of this distorsion.

Thanks,

Massimo

[Rémi Denis-Courmont]

Errm, you're using what payload format?

[mcosta]

The PayloadType is 0 (PCMU).

Packets are transmitted with interval of 20ms.

I'm using the Windows precompiled version of VLC 1.0.0.
I would like to activate some logging features of VLC but I don't know how do this

Thanks

PS. Using SoX, I converted RAW PCM data in Wav and AU file and VLC plays them correctly

[Rémi Denis-Courmont]

Payload type 0 (PCMU) is monophonic 8000 Hz "µ-law" logarithmic PCM, a.k.a. G.711. If you feed linear PCM samples, then yes, the sound should be distorted.

[mcosta]

Thank you for the answer. I'll try encoding data.