[QUOTE=midders;2439776]I’ve struggled with keeping AC3 5.1 sound with various DVD encoders; I never found a free 1-click solution. If you’re willing to pay for it then ConvertX will preserve a 5.1 soundtrack.
A free and higher quality (though slower) alternative that I found was to use FAVC in the usual manner, but then to extract the soundtrack from the original file (using Yamb and mp4box), and then edit the FAVC batch file to mux the original AC3 file in at the end rather than the stereo file that FAVC normally uses.
Another problem that I encountered was with AAC audio (often used with AVC/H264 video). The channel order is different from AC3 and most of the converters that I found don’t correct this problem; the best solution that I found was to convert the AAC to AC3 using foobar2000 and then use AVISynth to swap the channels, using the SoundOut() plugin to save the result e.g.
ch1 = getChannel(Audio,1)
ch2 = getChannel(Audio,2)
ch3 = getChannel(Audio,3)
ch4 = getChannel(Audio,4)
ch5 = getChannel(Audio,5)
ch6 = getChannel(Audio,6)
mergeChannels(ch2,ch3,ch1,ch4,ch5,ch6) # swapped to correct order
The correct order for the channels seems to be the source of some debate amongst the forums that I frequent; none of the suggested mappings that I found gave a correct output. The one that I eventually used gets the front left and front right channels in the correct order which is the most important thing from a consumer’s point of view.
Thank u so much midders u r the real cd freak…, u knw evthin to get it for me…, thanks a lot …, as u told I’m havin AAC audio used with H264 video. i was mistaken as ACC in the top. i hope i folow the instructions given you do right to get what i want. Knowledge is power. share what you knw.