3. Audio

This part deals with the encoding of the audio from ac3 files to a 2 channel ogg vorbis file with prologic2 surround using besweet and the oagmachine gui or 5.1 he-aac. This means that you can still get surround sound from the movie if you've got a prologic2 compatible receiver in the case of 2 channel vorbis. While you can guess the values fairly accurately when calculating the bitrate in the next steps you should encode the audio first for the best results. The only "tricky" part in this step is getting all the required files. You need besweet 1.5 (beta), nero 6 (copy aac.dll and aacenc32.dll to your besweet directory), the oagmachine gui, libvorbis 1.1.0 (plain version) and libmmd.dll (even with separate vorbis dlls you still need to install OggDS for the encoding to work). Once you've downloaded all required files decompress them into the same directory.

Vorbis

Note#1: While it is possible to create a 5.1 ogg vorbis audio file it's generally a bad idea since the decoder filter doesn't have a downmixing option and some soundcards just produce noise when playing audio with more than 2 channels. HE AAC is also much more space efficient.

Note#2: If there are two tracks with the same content (language) but different amount of channels you generally want to use the 5.1 (6ch) one when encoding the audio.

  1. Open the the audio stream (ac3) you ripped in dvddecrypter/smartripper.
  2. Check "Set Delay to" and enter the delay in the filename if it wasn't automatically detected.
  3. Select the quality. (3 or 4 recommended)
  4. Set all other settings as in the picture.
  5. Press "Give me OGG!" and wait.
  6. Repeat for all audio tracks.

AAC

Note#1: HE AAC is the preferred format for audio with more than 2 channels since it uses a much more efficient to compress it. This section only deals with 5.1 audio, use settings similar to the ones in the vorbis section for normal stereo audio.

Note#2: While the settings dialog appears to allow you to specify everything it doesn't mean it'll actually do it. The settings shown here will give you 5.1 he-aac audio at the highest possible constant quality mode at 44khz. The downsampling to 44khz is forced and automated. If you try to set a higher quality you will get lc-aac (low complexity) which requires much more space.

  1. Open the the audio stream (ac3) you ripped in dvddecrypter/smartripper.
  2. Check "Set Delay to" and enter the delay in the filename if it wasn't automatically detected.
  3. Select AAC output.
  4. Set all other settings as in the picture.
  5. Press "Give me AAC!".
  1. Set everything as in the picture or prepare to spend several hours experimenting.
  2. Press "OK" and wait. AAC encoding is much slower than vorbis.
  3. Repeat for all audio tracks.

WARNING: DO NOT ASSUME THAT THE SETTINGS ARE REMEMBERED.

Note: This dialog won't appear until besweet completes its first pass on the audio.

-When all audio streams are encoded close besweet read some about yatta.