Amplifying the sound on a DivX AVI

Hi there, I have encoded quite a few movies using XMPEG and DivX 5.02, but when I watch them the soundtrack is really quiet, even with the volume turned right up on WMP and on the TV. I was just wondering if there was any way that I could extract the soundtrack from the AVI, amplify it and put it back without having to re-encode the video (as that part is OK!), or are the two streams intrinsically linked to one another? Thanks for any help, The Moog

You didn't say which audio compression you used, so I assume MP3 (maybe VBR). You can open your AVI in NanDub, then File / Save WAV to get the MP3 file (having a WAV header, and a .WAV extension, if you didn't change it). Use a tool capable of changing the volume in your MP3 file without re-encoding (I think there are tools like "MP3 normalize" or similar). Then open your AVI again (if you closed it in the meantime), and mux the files again using NanDub. Choose the MP3 file under the audio options. Make sure you selected "Direct stream copy" under both, Video and Audio. Then File / Save AVI. bb

Hi- You can boost the volume without removing the audio, with the . But if you prefer to take the audio and work on it, then open the .avi in Nandub, set Audio and Video to Direct Stream Copy, and then File-Save WAV to strip out the Audio. Then when done, rename the extension (to .mp3, for example). Edit-you beat me to it, bb-I got interrupted while replying.:)

Sorry, I used MP3 compression at 128kb/s. Thanks for both the replies, I'll give it a go! The Moog

You'll want to use BeSweet for the audio. Download the latest BeSweet and then the GUI for it from the downloads section. read the guides on the site as well. your process will be a bit different since you're only re-encoding the the MP3 (not AC3 ~> MP3), mainly just easier. if you don't want to do all of this, use DeDynamic in playback (much easier IMO).

Hi- From the in the Audio Forum (always a good source when you have audio questions): Code:

BSPlayer has the DeDynamic filter "built-in". You can turn in on from the Preferences....Audio tab.

Thanks for all the help guys, I will take a look at each of these options and see which one suits me the best. Cheers again! The Moog

@The Moog : Encode audio separately 

@The Moog Hello, It's a well known problem of FlaskMPEG/XMPEG : the audio is always soooo weak... You should encode your video & your audio separately, by example : you encode the video stream with XMPEG and you encode the audio stream with HeadAC3he or BeSweet (the sound will be very fine !) and then you mux the two together with VirtualDub/NanDub. To do that, you have first to demux the AC3 track from the VOBs... A+