Linear PCM audio is a high fidelity, uncompressed digital sampling of an analog audio signal.
PCM sampling is the method of choice for DVD movie soundtracks, as well as hi fi audiophile music production. Unlike mp3 and other highly compressed formats, PCM strives to emulate the original analog sine wave as closely as possible.
Linear PCM audio is not difficult to repair when it is alone in the file:
Linear PCM can have several subtypes:
- resolution can be, from coarse to fine: 8 bits, 16 bits, 24 bits (integer) or 32 bits (float or integer).
- byte order is either little-endian or big-endian
- there can be one or several channels, each channel can be mono or stereo
- sampling frequency can be, from coarse to fine: 8000, 11050, 16000, 22050, 32000, 44100, 48000
Example of description given by QuickTime Player:
16-bit integer (Big Endian), Stereo, 48.000 kHz
Treasured can detect Linear PCM in damaged audio files, but it doesn't "preview" it.
How to repair a damaged Linear PCM file?
The easiest way is certainly to ask your Movie Repair Service to help you recover the unplayable audio file.
But for those who can program, here you have a few tips:
If the damaged file contains both video and audio, first you need to separate audio by scraping.
Then the audio raw data can be re-wrapped in an AIFF file quite easily.