[mythtv-users] How to convert PCM audio track to AC3?

David myth at dgreaves.com
Sat Apr 2 08:42:16 UTC 2005


William wrote:

>Thanks David. Can you give me a bit more detail on using avidemux(2) to
>convert to AC3? I did not see that option in my version.
>
>PS - The reason I want to use AC3 is because the dvd player in the truck
>will not play a pcm stream. I tried my ford and a buddies crapsler and
>neither will play the sound track. Video is fine, just no sound. Plays fine
>in my home players.
>  
>
Use avidemux 2.036 (I think the later ones are still a touch buggy)

Open the nuv file.
It should say 'this looks like mpeg do you want to index it'
say yes (!)

It then pops up a dialog asking about the audio - always hit 'scan file 
for audio stream'
It'll tell you what you've got in there (I get mpeg audio with a shift 
of 79ms. Remember the shift)
It then pops up another box to say 'we have a shift of 79ms between 
audio and video'
Hit OK

You can now edit out adverts.
I assume you know how to do this? ask if not

You won't be touching the video stream so ignore the options on the LHS 
under Video.

Under audio:
* select FFm AC3
* hit configure and select the audio bitrate you want
* hit A Filter and tick the timeshift box and enter the time shift you 
saw earlier - but negative. I use -79
* hit A Process (it sticks in)

[avidemux will pass the audio and video streams through, untouched apart 
from cutlists, unless you turn on 'A Process' or 'V process']

Under Output Format select Mpeg A+V
Now hit save and save the file as film.vob.
It's now ready to be dvdauthored...

David



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