Programm grading video quality?

[therock003]

I once knew of a programm that could analyze video streams and grade them based on encoding quality,but i don't remember how it was called.Can someone plz help me with that?I have made some test encodings,and i want it to analyze them and tell me which one is best.

[Krispy Kritter]

You can achieve the same thing by watching all of the streams.

[jagabo]

Gspot gives a quality value (Qf) as bits/pixel. But that's far from a real measure of quality.

MSU has a video quality tool but I believe it compares the output to the source:

http://www.compression.ru/video/quality_measure/video_measurement_tool_en.html

[SLK001]

Bitrate Viewer?

[therock003]

Ok i'll try the msu one,but instead of comparing the two encodings,i'll compare each one with the original,and try to draw conclusions.

[Krispy Kritter]

Software will only tell you the obvious. The higher bit rate for any given resolution, will get the "highest" score, and hence be the "best".

The real question, is what is the video far? What are your guidelines or limitations? What is your source? What is the destination?

Regardless of what any software tells you, the best tool is your eyes. You are the one that will decide what is acceptable to you.

[jagabo]

Software will only tell you the obvious. The higher bit rate for any given resolution, will get the "highest" score, and hence be the "best".

For example, you could encode with Xvid with a constant quantizer but two different motion search precisions. The file with the lower motion search precision will be larger. Software like GSpot will tell you the larger file has a higher quality (more bits per pixel) when in fact the two files are visually (nearly) identical.