Moving Video Resolution Test Results From Old Forum

[jchunter_2]

This http://www.streamcrest.com/mp4.shtml is a very jazzy movie that really tests any thing that encodes, decodes, and displays video. I encourage everyone to try this at home.

I used VS8.01 to convert the uncompressed file to “DV format” (A.K.A. Type 1 AVI), which I exported to the camcorder and then captured back to the computer, first as AVI Type 1, then as Mpeg2. Then I compared the two capture files using Windows Media Player.

The results: After watching these two files about 20 times, I see no discernable difference between the Mpeg and the AVI capture files. If there are differences, they are smaller than can be detected using this test video.

Some Statistics:
Uncompressed AVI file: 264 MB, Bitrate: 30,345 Kbps.
NTSC drop frame (29.97 fps)
Microsoft AVI files
24 Bits, 720 x 480, 29.97 fps
Lower Field First
Uncompressed
Interleave audio for every 15 frames
DV Audio -- NTSC, 48.000 kHz, 16 Bit, Stereo

“DV” format - Type 1 AVI: 30.5 MB
NTSC drop frame (29.97 fps)
Microsoft AVI files
24 Bits, 720 x 480, 4:3, 29.97 fps
Lower Field First
DV Video Encoder -- type 1
DV Audio -- NTSC, 48.000 kHz, 16 Bit, Stereo

Captured Type 1 AVI: 33.5 MB
NTSC drop frame (29.97 fps)
Microsoft AVI files
24 Bits, 720 x 480, 4:3, 29.97 fps
Lower Field First
DV Video Encoder -- type 1
DV Audio -- NTSC, 48.000 kHz, 16 Bit, Stereo

Captured Mpeg2: 8.1 MB
NTSC drop frame (29.97 fps)
MPEG files
24 Bits, 720 x 480, 29.97 fps
Lower Field First
(DVD-NTSC), 4:3
Video data rate: Variable (Max. 8000 kbps)
Audio data rate: 224 kbps
MPEG audio layer 2, 48 KHz, Stereo

[THoff]

I've used the same source material to test the MPEG encoder by repeatedly encoding the file with SmartRender turned off, and using the output file as the input file during the next iteration.

There was a slight degradation of quality over time, but even after 10 iterations, the difference between the last output file and the original I started with was not readily apparent.