MPP - Video Gallery

MPP home

MPP - Video Gallery

THIS IS AN OLD (1998) VERSION
In http://mediateca.elis.org you can find a newer one

To watch the videos you need the

NETTUNO courses

Sintesi dei contenuti del corso	Docenti	Video in formato MPP
Reti di calcolatori	Prof. Silvano Gai (Politecnico di Torino)

COMPARING DIFFERENT ENCODING SCHEMES

The source is a 20 seconds clip, taken from a VHS cassette (which was recorded with a S-VHS camera), played through a Panasonic SVHS NV-HS1000 videorecorder, using a S-Video cable. The encoding was done on a Windows NT 4.0 Hewlett-Packard Kayak XU (Pentium II 300 Mhz), directly from the videorecorder, using an Osprey 100 video card, with version 1.2 driver and these settings.

filename	target bitrate	actual bitrate	buffer time	average frames per second	size	band for audio	RealEncoder optimization	Panasonic setting	Software precompression
20-192-6.5-m-so-v75.rm	20000	22367	3,6	7,8	192x144	6,5	medium	sharp	Video1 at 75
20-192-6.5-f5-so-v75.rm	20000	19082	1	4,8	192x144	6,5	fixed 5 fps	sharp	Video1 at 75
20-192-8.5-f5-so-v75.rm	20000	19425	1,1	4,8	192x144	8,5	fixed 5 fps	sharp	Video1 at 75
20-192-6.5-sh-so-v75.rm	20000	21329	3,4	4,3	192x144	6,5	sharpest	sharp	Video1 at 75
20-192-8.5-sh-so-v75.rm	20000	21850	3,7	4,0	192x144	8,5	sharpest	sharp	Video1 at 75
20-192-5-sh-so-v75.rm	20000	22459	3,4	4,4	192x144	5	sharpest	sharp	Video1 at 75
20-192-5-sh-sh-v75.rm	20000	23019	4,2	3,5	192x144	5	sharpest	sharp	Video1 at 75
20-192-5-f4-m-v75.rm	20000	19969	2,3	3,8	192x144	5	fixed 4 fps	middle	Video1 at 75
20-192-5-m-m-v75.rm	20000	23174	4	7,0	192x144	5	medium	middle	Video1 at 75
20-192-5-sh-m-no.rm	20000	22249	4,1	4,0	192x144	5	sharpest	middle	No compression
20-192-5-sh-m-v0.rm	20000	21808	4,1	3,9	192x144	5	sharpest	middle	Video1 at 0
20-192-5-sh-m-v100.rm	20000	22990	4,2	3,8	192x144	5	sharpest	middle	Video1 at 100
20-192-5-sh-m-v75.rm	20000	22357	3,7	3,8	192x144	5	sharpest	middle	Video1 at 75
20-160-5-sh-m-v75.rm	20000	20941	2,9	4,2	160x120	5	sharpest	middle	Video1 at 75
20-288-5-sh-m-v75.rm	20000	23197	5,6	4,0	288x216	5	sharpest	middle	Video1 at 75
20-384-5-sh-m-v75.rm	20000	23345	9,7	1,1	384x288	5	sharpest	middle	Video1 at 75
20-192-8.5-sh-m-v75.rm	20000	22725	4,4	3,5	192x144	8,5	sharpest	middle	Video1 at 75
45-192-8.5-sh-m-v75.rm	45000	47474	2	5,5	192x144	8,5	sharpest	middle	Video1 at 75

filename
the filenames follow this notation:

target bitrate	size	band for audio	RealEncoder optimization	Panasonic optimization	software precompression
	width in pixels		sh = optimize sharpest m = optimize middle sm = optimize smoothest f5 = fixed 5 frame per second	so = soft m= middle sh = sharp	no = frames not compressed v75 = Microsoft Video 1 with compression at level 75 (always with 1 key frame every 15 frames)

target bitrate
The requested bitrate before encoding.

actual bitrate
The actual bitrate after encoding. Sometimes it is higher than the requested, because of the selected options which cause higher requirements.

buffer time
Produced by the encoder

average frames per second
The actual result after encoding.

size
In pixels. Both sides must be multiple of 16, with the exception of the allowed 160x120.

band for audio
Reserved band for audio. 5, 6.5 and 8.5 kbps all have a frequency response of 4 Khz.

RealEncoder optimization
The setting during the encoding. It can optimize the quality of the image (sharpest) or the movement (smoothest) or try a best solution (middle). The alternative is to fix a frame rate.

Panasonic setting
The Panasonic videorecorder has the capability of softening or sharpening the image, while playing a cassette. The "middle" setting does not change the source.

Software precompression
The Osprey 100 (which has not any hardware compression capability) has an Option/Set video compression which let you choose if you want to compress via software while encoding. This means that, using the RealEncoder, there is a double compression: first the one set by Osprey and then the Real one. The RealEncoder manual suggests not to use any compression.