Thank you for the exact link to the "high-quality" video. I have downloaded all 300MB (that's M
Bytes, not M
bits) and looked at it briefly in a video player and imported it to a video editor. I'm not sure what you intend to prove by this, but here is my analysis:
It is a 298.45MB AVI clip, 2 minutes, 20 seconds and 20 frames long. Some additional specs:
Encoding: H.264AVC
Frame Rate: 29.97
Video bit Rate: 17.24Mb/sec
Width: 1280pixels
Height: 720pixels
Audio: MPEG 3
Audio Bit rate: 48kb/sec
Audio sampling rate: 24Khz, stereo
AVI is capable of storing a high-quality, uncompressed image, but it cannot recreate anything that was removed before making the AVI file, and processing with a poor choice of parameters will negate many of the AVI file advantages.
It appears to be several copies of a 30 second segment of a news show with Dan Rather narrating. There are two clips, both cropped from TV 4:3, side-by-side. There appears to be a slight difference between the two sides in color tint, but otherwise they appear to be the same clip and synchronized.
Some portions appear to be enlarged from other parts. Enlarging tends to magnify errors, not eliminate them.
In all parts, the quality is far below standard TV broadcast quality, exhibiting considerable video (color) noise, bit rate compromises and compression errors. My guess is that there is one "original" that was recorded on VHS tape, but has either been degraded since, or the recorder wasn't working up to par at first. Perhaps the heads were dirty either for record or playback, or both. Perhaps the tape was/is substandard or damaged. It's also possible the degradation came later after the clip was duplicated side-by-side (I'd have to analyze it more carefully to determine that, which I will be glad to do if you pay me my usual consulting fee for such technical work, up front). Regardless, the quality is not as good as some present-day YouTube clips I myself have posted.
The enlargements, in particular, show copius examples of JPG-type artifacts. No, I can't call these GIF artifacts, as I suspect GIF was not used as an intermediate file. JPG-type artifacts (blockiness, shifting of sharpness, color shifts, edges of objects duplicated and blurred) can be caused by video processing at low data rates, and it looks like this is what happened here.
Examining the enlargement clips frame by frame suggests that many of these artifacts were added AFTER the original broadcast video was created, somewhere along the data stream from a bad VCR, thru a bad video computer edit, to a bad output. Each step added something that wasn't in the original.
To sum up, the only thing this video is good for (and I haven't even approached the matter of provenance and possible deliberate alteration) is to make gross observations; i.e., did the building fall down, up, or sideways? Most anything else derived from this video is open to interpretation and needs corroboration.