[FFmpeg-user] Transrating of G.711 RTP from 20ms to 30ms

[Julien Nephtali]

I am trying to transrate an incoming stream of RTP G.711 packets that have
a size of 20ms to an outgoing stream of G.711 packets of 30ms.

I set up a steam of G.711 RTP traffic at 20 ms (packet size= 160)

*ffmpeg -i ./tornado_spotted.wav -re -vn -acodec pcm_alaw -f rtp rtp://
10.14.56.48:10200?pkt_size=160*
*
*
This test stream is sent to a second ffmpeg that I want to use to transrate
the RTP stream to a packet size of 30ms. Here is the command.

*# ffmpeg -i ./test_stream.sdp -vn -acodec pcm_alaw -f rtp
rtp://localhost:10300?pkt_size=240*

However the *pkt_size* setting seems to be a maximum packet size setting
and does not force the transrating of the packet. Does anyone know how I
could force the transrating ?

Thanks