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Old 22nd July 2017, 21:10   #15  |  Link
tebasuna51
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Join Date: Feb 2005
Location: Spain
Posts: 6,915
Quote:
Originally Posted by Meow View Post
Sounds worse imo tbh.
Maybe my original "Alan Walker - Fade [NCS Release]" was worse (I think than is over saturated)

Using my own source (Mozart) I make a test to know if there are any advantage, audio only related, when play a video at 2x fps.

- The video must have double duration (double size) than original audio in 2x mode.

- The process to obtain audio for 2x videos was explained in my first post.

- Work fine for me, using mpc-hc, forcing 2x.

Here are my test and some data to compare:

Code:
                                        Audio 1x              Audio 2x
                                   --------------------  --------------------
Video      Full size   Audio size  Samplerate  Bitrate   Samplerate  Bitrate
---------  ----------  ----------  ----------  --------  ----------  --------
Test_0.1x  11.918.113   9.832.907    44.100    605 Kb/s      -          -
Test_1.1x   6.825.835   4.754.353    44.100    292 Kb/s      -          -
Test_1.2x  10.742.783   6.504.371    22.050    200 Kb/s    44.100    400 Kb/s
Test_2.1x   5.310.606   3.236.032    44.100    199 Kb/s      -          -
Test_2.2x   7.553.672   3.324.731    22.050    102 Kb/s    44.100    204 Kb/s
Test_0 have the original FLAC source.

1) Test_1
I used qaac to encode to max quality (V 125) the audio and we can obtain a, theoric, better quality (400 Kb/s vs 292 Kb/s) in 2x mode.
The questions are:

1.1) Is really better?
My old ears can't difference them. Maybe some "golden ears" can say something.

1.2) The full video size is near the size than the reference Test_0.1x and can't be better.
I can't see the advantages.

2) Test_2
Now the encodes was make at v 196 and v 98 to obtain the same size for audio and a equivalent bitrate (199 Kb/s vs 204 Kb/s) in both modes.

Like before I can't difference them, but in theory must have the same quality.

The full video size 2x is greater than 1x, even greater than Test_1.1x with better audio bitrate (292 Kb/s)

I can conclude than, in my opinion, this thecnique is usseless for audio quality.
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Last edited by tebasuna51; 22nd July 2017 at 21:24.
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