Can you get 5.1 sound with mp3 audio and DivX video?

[Acceler8n]

How do you get 5.1 surround sound audio with DivX video using GKnot? I've seen some XviD files with 5.1 sound but I think those were muxed with AC3 audio...thank you for any replies.

[DK]

mp3 can contain an 2.0 surround signal.

5.1 dd, however, is not possible with mp3.

you'll have to use ac3 or ogg vorbis instead.

[jggimi]

If your source for the .mp3 was a 5.1dd .ac3, the transcoding will contain Dolby Surround (TM) encoding, which can then be decoded by a Dolby ProLogic (TM) decoder.

I use this method to regain surround sound when I playback through my home theatre from my laptop. S-video into TV, and audio into surround sound system that includes ProLogic.

[Acceler8n]

Thanks for the reply...

To jggimi:

I am confused with the new audio settings for lame for the new GKnot version .27. What would you recommend to use for the audio settings for using mp3 sound in my DivX video to achieve the optimal 5.1 sound?

I use WinDVD platinum to view all my DVDs, DivX, and movie files. I think it does have Dolby Prologic II decoder in the player software.

[jggimi]

Honestly, I use Doom9's recommendations....

If your PC has surround sound, and support DD, then you will get much better results retaining the .ac3 sound stream. I use .mp3 because all my PCs have standard stereo and standard analog audio outputs, including the laptop.

My surround sound system accepts DD (in bitstream or PCM), as well as analog inputs and has ProLogic I. But even with ProLogic, only some surround sound is retained. It does not have the channel separation of DD, obviously.

[Acceler8n]

Hi jggimi,

I just tried muxing the video with mp3 audio then with ac3 audio to compare. I used PowerDVD XP and WinDVD Platinum to play the resulting files, but I dont not get 5.1 sound even with the AC3 muxed DivX file. I made sure that DPL2 was set on for the mp3 divx file and the file with ac3 should automatically produce 5.1 sound right? I made sure the stream used was the 5 channel stream also. Can you help me on how I can get 5.1 playback of DivX files? Thanks.

[manono]

Hi-

Maybe there's something in the AC3 Q&A (http://forum.doom9.org/showthread.php?s=&threadid=18318) that can help you.

[Acceler8n]

Thx for the reply manono,

I do have the filter installed. And I do get sound when I play the divx file back...but the audio is in 2 channel and not 5.1. Is there a way to play DivX files in 5.1?

[manono]

Sorry Acceler8n-

But audio's not really my speciality. Plus, it varies depending on the set up and what you're trying to do. So, you're sure that the AC3 is 5.1 to begin with, right? In my case (if I remember correctly), I enable SPDIF in my Phillips Acoustic Edge sound card, set the output for 5.1 speakers, and then go into the AC3 filter and set it also for SPDIF, and then the sound goes to the decoder by the TV. You would do something similar with your setup, and maybe in WinDVD or PowerDVD also. But this question might be better answered in the Audio forum. You'll find the real experts over there.

I'm a little confused though. I'm referring to getting the DD5.1 when the original AC3 is muxed in. If you're still talking about surround MP3, then I do it as jggimi explained earlier.

I made sure that DPL2 was set on for the mp3 divx file and the file with ac3 should automatically produce 5.1 sound right?

No, because Prologic is analog and the AC3 is digital, so you have to make changes in your configuration. But I'm already in over my head (please don't scold me DSPguru:)).

[Acceler8n]

I made two different DivX files, one with MP3 audio, and one with just muxing the AC3 audio. I will post this question in the audio section, thank you for your reply! I wil also try the settings you mentioned. thanks again.