Audio breaks problem when transcoding to acodec=mp4a

[ashwani]

Hello everyone,

I am using the following command to transcode an avi file to mov/mp4 using the mov/mp4 mux, however the resultant file has audio breaks /disappearance problems when playing in Quick Time, though it plays fine in VLC.
VLC 0.8.6d used to work fine, however i have faced this problem when using vlc 0.9.2 and vlc 0.9.8

cvlc -vvv file:///root/sample.avi --no-drop-late-frames --sout-x264-keyint 20 ':sout=#transcode{vcodec=h264,fps=30,vb=512,venc=x264{keyint=10,min-keyint=5,scenecut=10},scale=1,acodec=mp4a,channels=1}:std{access=file,mux=mp4,dst=sample4.mp4}'

However, when I run a stand alone ffmpeg command to convert to mp4, the resultant file plays fine in Quick time

ffmpeg -i sample.avi -vcodec mpeg4 -vb 512000 -acodec libfaac -ab 32000 -ac 1 sample.mp4

VLC is using the same ffmpeg library to do the transcoding, but the results are not the same.

thanks in advance for your help.

[incarnateX]

wonder if there are some parameters to control use of ffmpeg analogous to the ones used for x264. or maybe the vlc is not using ffmpeg but some other codec, that's why the difference.