WANTED: PSNR comparison of X.264 and x265 codecs with their max settings.

[Stears555]

HI!

Wanted and important!

Can you test these two codecs?

Now we can use the newest Hybrid as transcoder to transcode high quality full HD input videos... Do you have any PSNR test programs?

Please post your test results (scientific charts of the results, or videos or photos from the transcoded frames) here!

Thank you for your reply!

[Selur]

First thoughts:
--------------------------

Can you test these two codecs?

Sure, but why can't you do it yourself?

Do you have any PSNR test programs?

Both x264 and x265 can output PSNR values.
Where is the problem?

Do you have any PSNR test programs?

What should that PSNR test program do? I guess the goal is not to compare two PSNR results, because that would be silly.


More seriously:
--------------------------
you asked for a

PSNR comparison of X.264 and x265 codecs with their max settings.

since you didn't specify what you understand under max settings, I assume you mean you want settings which preserve most of the original information.
-> No need to test, x264s lossless mode wins since x265 doesn't have a lossless mode yet. Lossless mode, is like the name implies lossless, so the PSNR is invalid or unlimited (due to a division through zero ).

=> If you want something, and you are for some reason not able or willing to do it yourself, at least be more precise about what you want.

by the way:
------------------------
You do know what PSNR is measuring and why metrics like ssim, mse, vqm and the likes were 'invented', right?
-> measuring PSNR on it's own normally is a bad thing for a codec comparison

you could use the "MSU Video Quality Measurement Tool" if you:
a. losslessly convert your source into a format which is supported by the tool
b. losslessly convert your encode into a format which is supported by the tool
c. feed the converted source and the converted encodes to the tool
see: http://compression.ru/video/quality_measure/video_measurement_tool_en.html

Cu Selur

[Stears555]

First thoughts:
--------------------------

Can you test these two codecs?

Sure, but why can't you do it yourself?

Do you have any PSNR test programs?

Both x264 and x265 can output PSNR values.
Where is the problem?

Do you have any PSNR test programs?

What should that PSNR test program do? I guess the goal is not to compare two PSNR results, because that would be silly.


More seriously:
--------------------------
you asked for a

PSNR comparison of X.264 and x265 codecs with their max settings.

since you didn't specify what you understand under max settings, I assume you mean you want settings which preserve most of the original information.
-> No need to test, x264s lossless mode wins since x265 doesn't have a lossless mode yet. Lossless mode, is like the name implies lossless, so the PSNR is invalid or unlimited (due to a division through zero ).

=> If you want something, and you are for some reason not able or willing to do it yourself, at least be more precise about what you want.

by the way:
------------------------
You do know what PSNR is measuring and why metrics like ssim, mse, vqm and the likes were 'invented', right?
-> measuring PSNR on it's own normally is a bad thing for a codec comparison

you could use the "MSU Video Quality Measurement Tool" if you:
a. losslessly convert your source into a format which is supported by the tool
b. losslessly convert your encode into a format which is supported by the tool
c. feed the converted source and the converted encodes to the tool
see: http://compression.ru/video/quality_measure/video_measurement_tool_en.html

Cu Selur

Can you make an own fast test with a short but detail-rich full HD video? (with numbers and photos)

Thank you for your reply!

[Selur]

Could I: probably yes
Am I going to do something like that: Definitely no!
Creating a proper or at least non-crappy quality comparison takes quite some time.
(choosing the right source, the right settings for each tool, thinking about what to show how,...)

[Stears555]

Could I: probably yes
Am I going to do something like that: Definitely no!
Creating a proper or at least non-crappy quality comparison takes quite some time.
(choosing the right source, the right settings for each tool, thinking about what to show how,...)

Sample source file: http://dvb-t.atw.hu/lizard.MTS

(It's only 200 Mbyte. Event/theme: Common wall lizard sunbathes during snowbreak) It is a Progressive Segmented Frame video, so the turning off the automatic deinterlacer is a necessity to get proper progressive output.

[jagabo]

MSU Quality Measurement Tool can compare an encoded video with a reference video and tell you the PSNR (and some other "quality" measurements).

But PSNR isn't a great measure of visual quality. And we all know x265 is better than x264 at low bitrates.