Disable internal ffmpeg codecs?

[McAlsop]

I have an mpg file (a wtv file recorded from Windows Media Center converted to dvr-ms, converted to mpg) that I'm trying to convert to mp4 using ffmpeg. When I play the file in Windows Media Player it works. When I play it in VLC and Media Player Classic, there is no sound until I disable their internal codecs.

The correct codec (filter) to use is AC3Filter. Then sound works. However, ffmpeg must be using some internal filter because I'm getting no sound from the conversion, plus, the AC3Filter tray icon doesn't show up during conversion.

I've checked graphedit, and it shows that it should be using AC3Filter. The Audio Codec reported by VLC is "mp2."

Does anyone know of a way to disable internal ffmpeg codecs or force it to use AC3Filter?

Thanks!

[AlanHK]

ffmpeg is not the same as ffdshow. If you're using to convert, it's just operating on the file data, it isn't displaying it to Windows, it will only use its own filters.

And MP2 is not AC3, so I wouldn't be too sure of what it actually is.

Perhaps demux to separate audio and video files and try to convert these, then mux back.

Otherwise, looking at ffmpeg command line options:
-acodec codec force audio codec
might be useful.