Incredibly slow import in 2.3.0

[steve]

I just tried the latest alpha as well. Import of the same file I tested with earlier takes 3 seconds, slightly slower than 2.2.2, but remarkably faster than 2.3.0.

2 or 3 seconds seems close enough considering that there are many other variables. If possible, could you do a comparison of Audacity 2.2.2 vs 2.3.0 with a much larger file? (20 seconds vs 21 seconds is insignificant, but 20 seconds vs 30 seconds may be something the developers want to fix).

[waxcylinder]

I tested this with importing a one hour AAC (M4A) audio file - and although my results are not as extreme as normann1974 reports, I can confirm that 2.3.0 is indeed slower at that import than 2.3.0. But the good news is that the upcoming 2.3.1 appears to have fixed this and is now even faster than 2.2.2.

2.2.2 15 seconds
2.3.0 82 seconds (5.55 times slower 0 normann1974's is 21.5 times slower)
2.3.1 alpha 9 seconds

Peter.

For comparison I tested the same one hour AAC file on my Macbook Pro running Mojave 10.14.2
Here I find that 2.3.0 and 32-bit 2.3.1 are actually a bit quicker than 2.2.2 - I can't trest yet on 64-bit 2.3.1 64-bit for Mac as we haven't yet got the 64-bit FFmpeg library compiled and installed for testing.

2.2.2 33 seconds
2.3.0 25 seconds
2.3.1 alpha 32-bit 25 seconds

I don't understand why the Mac version is so much slower than Windows for this test - theye are both hi-spec machines with fast non-rotating SSD drives ...

Peter.

[steve]

I don't understand why the Mac version is so much slower than Windows for this test

There are many platform specific optimization that can be made when writing and building applications. For example, SBSMS time stretching is significantly faster on 64-bit Linux than on 32-bit Windows or Mac, because of ONE optimisation switch when compiling SBSMS (I don't know if Paul has applied this optimisation for 64-bit Mac builds).

Overall, Windows, Mac and Linux are likely to run applications at about the same speed on similar hardware, but there are often differences in speed with specific task due to different optimisations. Linux can often appear quicker because it tends to use far less horsepower doing background tasks.

[normann1974]

By default, Audacity uses "liboggvorbis" (not FFmpeg) to import OGG files, though it is possible (but not recommended) to import OGG files with FFmpeg.

[/code]

Code: Select all

13:09:59: Mime type is *
13:09:59: Opening with liboggvorbis
13:09:59: Opening with libav

I haven't configured anything but add the FFMPEG library so that Audacity can read all the formats it needs to.

/Jan