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Treasured's Movie Repair Guide -- Uncompressed

External recorders like Black Magic or AJA Ki models, extend the possibilities of video cameras in terms of format, quality, bitrate, audio capture and workflow. Internal camera recording can also happen in parallel without external output in some cameras.

Uncompressed format is the most basic way to represent animated images based on two main properties:

That means that on screen, each pixel has 3 properties that define its color and brightness: Red, Green, Blue. Screens with "Millions+" of colors, each properties can range from 0 to 255, and thus are encoded with 8 bits.

There are several ways of representing the pixel, for example changing the order of properties gives RGB or BGR. The entire screen is an array of w=width x h=height pixels, so one could encode the raw image as w x h x 3 bytes, where first w x 3 bytes encode the first line, as RGB RGB RGB ... ... RGB.

Another approach is to encode by planes, first w x h bytes with all Rs, then w x h bytes with all G, and finally w x h bytes with all B. This is called planar RGB.

Color spaces are tridimensional, so besides RGB, there exist other ways to map colors using 3 parameters. In photography, the most popular is YCBCR.

Most common pixel formats found in production are 8bit 4:2:2 YUV (also called '2vuy') and 10bit 4:2:2 (called 'v210' or 'R10k' depending on vendor).

If you decode the image with a pixel format different from one used for encoding, or if you don't correctly assert the frame alignment, we can get really funny results.
The pictures above show what happens when you get the frame alignment wrong by just one byte in a '2vuy' uncompressed image.

Failure modes:

The causes of failure reported by users needing to repair Uncompressed files are:

Repairability

Uncompressed is pretty hard to repair as several issues must be resolved to properly detect and categorize the correct variation used. Once done, Video and audio are recovered at original quality.

Huge Uncompressed files (tens to hundreds of GB) are not a problem for Treasured and our remote repair system, since only around 100 MB of data need to be sent via Internet. With a small sample, we can figure out the repair technique and send the repair program to the customer.

A good file in the request is recommended. Even if the good file contains only a few frames, the fact that it was encoded with the exact settings of the damaged file will provide useful information:

This information can be guessed from a damaged file, but through a very lengthy trial-and-error iterative process.

How to repair a corrupted Uncompressed movie

Techniques used to fix clips are:

Free Preview of corrupt Uncompressed videos with:

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Version 4.3 • May '18 • 10 MB • Mac OS X