5 channel audio??

[JTDROB31]

To:The great people of the Doom9 forum.

Good day,I have a question about a slite audio problem.I have a movie with ac3 5 channel audio and I want to convert it to Wav.Well, I used the wav audio in my last Mpeg2 encode.The audio did
not turn out very good.It has a ''choppy'' sound.Is it normal for 5 channel audio to have these problems?I have not yet tried to convert
AC3 to MP3. I may try later on.If you could clear this small problem
up for me it would be great.Thanks for all your help and time.


Have a great day.

[jggimi]

I would say that the majority of users here have not had your same experience. Without more information, we probably can't give you much help other than to point you to the Audio FAQ (http://forum.doom9.org/showthread.php?s=&threadid=7633) and the AC3 Q&A (http://forum.doom9.org/showthread.php?s=&threadid=18318). For example, what toolset are you using to convert from Dolby Digital (.ac3) to Linear PCM (.wav), what toolset are you using to multiplex audio and video, and what A/V player are you using when you experience the problem?

[Awatef]

May be I know what's going on.

First, my method of converting ac3 5.1 to wav: I use the AZID program in a DOS window like this:

azid -L -3db -a filename.ac3 filename.wav

Now, there are some ac3 files that are not coded in 16-bit, but in 20 or 24-bit. If you convert with the command line I gave above, you'll have choppy sound. In such cases add "-F wav24" after "-a"
This will produce a 24-bit WAV file with no distortions.
For converting 24-bit WAVs to MP3, use RazorLame (GUI for Lame)