How to convert AC3 to MP3?

Greetings, everyone.
I’m attempting to watch a movie via the USB port on my satellite receiver (an Infinity 1040), but I’ve run into a bit of a snag: I have the picture, but absolutely no sound. Here are the rip specifications:

[Video Info]
Decoder - (MPEG2) KMP Video Codec(AVC1-libcodec.dll)
Format - Major Type: Video - Sub Type: YUY2
VideoInfo2: YUY2 1024X-416, 16 bits

[Audio Info]
Decoder - (0x2000) AC3 Filter for AC3
Format - Major Type: Audio - Sub Type: PCM
WaveFormatEx: PCM(0x1), 48000 Hz, 16 Bits, 2 Ch

My plan is to convert just the audio from AC3 into something like an MP3. I want to leave the video untouched to ensure speed and preserve the visual quality—just the sound needs changing. Is there a specific program capable of this, and what would be the proper procedure?

Kenneth Grant70 said:Hey everyone!
I’m trying to watch a movie via the USB port on my satellite receiver—an Infinity 1040—but while the picture looks great, there's absolutely no sound! Here are the rip specs:

[Video Info]
Decoder - (MPEG2) KMP Video Codec(AVC1-libcodec.dll)
Format - Major Type: Video - Sub Type: YUY2
VideoInfo2: YUY2 1024X-416, 16 bits

[Audio Info]
Decoder - (0x2000) AC3 Filter for AC3
Format - Major Type: Audio - Sub Type: PCM
WaveFormatEx: PCM(0x1), 48000 Hz, 16 Bits, 2 Ch

Now, my plan is to convert just the audio from the AC3 format into something like an MP3—but here is the kicker—I want to do it without touching the video at all! You know, for the sake of speed and to ensure the video quality stays perfectly intact... I just need to swap the sound. Is there some kind of program out there that can handle this, and if so, what's the best way to go about it?

Well, you could try using Format Factory—it's a free program, and once you get it open, you can set everything to MP3. From there, you just load up the file you want to work on, and boom, you'll have your MP3 ready to go. After that, you'll want to use VirtualDub Mod, which is also free, to strip out the old audio and drop in your new MP3 instead.
To walk you through the steps: Open VirtualDub, head over to "streams," then click on "stream list" where you'll see the current audio track. Click "Add" and select that MP3 you just made. Then, highlight the original audio, hit "disable," and use that little trumpet icon to switch over to the new audio track, then hit OK.
Once that's done, just go to "File," then "Save As," and make sure you select "Direct stream copy" in the video mode! This is crucial because it means you won't be re-encoding the entire video—you're just swapping the audio. Pick your filename, choose where you want to save it, hit OK, and just wait a few minutes depending on how long the movie is.

Thanks analogwalker2. I was already aware of how that VirtualDub process works, but I can’t seem to open any MKV rips with it, and I have no clue if an upgrade is even possible. Honestly, I'm not exactly a tech wizard when it comes to software updates. I'm currently sitting on version 1.9.8. I spent some time today downloading various converters, but none of them quite hit the mark like VirtualDub did. I thought finding a substitute would be a breeze, but apparently not. None of these tools offer a direct video stream option; they all force you through a full conversion process. It takes forever and inevitably tanks the image quality. Do you happen to know of any programs that function similarly to VirtualDub?
Best regards

Kenneth Grant70 said:Thanks, analogwalker2! I actually knew about that whole process with Virtual reality, but I can't seem to open an MKV rip with it—I'm not sure if there's an upgrade available? I haven't checked for any updates lately. I'm currently running version 1.9.8. I downloaded a bunch of different converters today, but honestly, none of them stack up to Virtual reality. I thought finding a similar tool would be a breeze, but nothing else offers that direct video stream option; they all force you to convert everything, which just takes forever and ruins the picture quality. Do you happen to know of any programs that act similarly to Virtual reality?
Best regards,

Look, if you’re trying to convert from one format to another, you simply can't avoid losing some quality—it's just the way it works! Think of the MKV format as this relatively new thing; it's essentially a type of video compression. It's a lot like when you take high-fidelity audio and convert it to an MP3; yeah, you lose some fidelity, but if you set your conversion parameters to the absolute maximum, that loss is going to be practically imperceptible. So, really, if you want to convert, you have to accept that slight dip in quality, or just don't bother doing it at all!

You also have to keep in mind that since MKV is still somewhat "new" in this arena, very few standard standalone DVD players can even read the format. What does that mean? It means you're pretty much stuck watching it on a PC. If you actually want to play it on a regular old DVD player, you'll have to convert it back to something like DivX again.