[Libav-user] muxing-example.c on windows

[Sartre Salam]

Hi , I have compile the muxing-example.c on windows 

with the last binaries from Zeranoe.com. 
After this I try to mux an .mp4 file , but 

I get the error "[mp4 @ 00622bc0] pts <0> < dts <1> in stream 0
Error while writing video frame" 

Then I try to mux a webm file and it was successfull,
I only have to change the sample_fmt from audio encoder
from AV_SAMPLE_FMT_S16 to AV_SAMPLE_FMT_FLT.
But the sample webm file has no sound.  There are another
tutorials about muxing with ffmpeg liavformat libraries?
And it is possible to encode and decode audio with 

the vorbis encoder ?

thnx
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