TMPGEnc - Is the LPCM audio compressed?

[ChachiFace]

Is the LPCM audio from TMPGEnc compressed?

Example:

After I have encoded by movie (movie.avi --> movie.mv2 & movie.wav) using TMPGEnc, is the .wav file compressed or uncompressed?

ChachiFace

[freestyler]

Judging by what you've written, it seems that you've maybe only demultiplexed and transcoded/decoded your movie into elementary mpeg streams.

The wav file should have been decoded from your source and should sound practically identical to your source audio. No compression took place.

If I have this backwards and you really meant (m2v+wav > mpeg) your wav file was probably encoded into mpeg layer 2 audio, the bitrate is dependent upon what standard format or custom setting your output is set to, but yes, in that latter scenario your audio would have been compressed.

[spectroelectro]

The WAV file format is UNcompressed. LPCM stands for "linear Pule Code Modulation," where linear means "straight out with nocompression."
Pulse Code Modulation is the code used to convert bits into amplitude of a waveform, viz., 16 bits equals 65,535 discrete equidistant voltage levels of an audio waveform. (Some PCM formats use non-lienar non-equidistant voltage stpes -- viz., mu-law encoding.)
In order to get a compressed audio format you must use somethng other than PCM. Ogg Vorbis and Dolby AC-3 and MP3 (mpeg 1 layer 3) are three of the better forms of audio compression, but they're lossy -- meaning they throw away a large amount of the audio information, typically up to 80%. FLAC is a form of audio compression which is LOSSLESS, the audio equivalent of Ben Rudiak-Gold's huffyuv. (FLAC stands for "Free Lossless Audio Compression.")
The only compressed audio formats which are directly dupported int he plain-vanilla DVD spec are mp2 (mpeg 1 layer 2) and Dolby AC-3. BeSweet, a piece of excellent freeware, can produce AC-3 and LAME or TMPGenc can produce mp2 from WAV files.

[ChachiFace]

Thanks for the responses, I believe this answers my question.

I am using TMPGEnc to de-mux into 2 elementary streams (.mv2 & .wav). Then I export them into my authoring software. I want my audio to be uncompressed, so this is good. I know there are advantages to having compressed audio but I don't want to loose anything and I'm not worried about fitting more time on one disc. Having around 90 min. of footage on one disc is fine for what I'm doing.

Thanks again,

ChachiFace