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Old 7th January 2020, 22:17   #1  |  Link
Myrsloik
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BestAudioSource

Imagine if FFAudioSource actually worked and was accurate (but a bit slow). That's what I'm going for here. Also no indexing required...

Usage:
Code:
BestAudioSource(filename, track=-1)
or
vs.core.bas.Source(filename, track=-1)
Positive track numbers refer to the FFmpeg given stream number. Negative numbers refer to the nth audio track with -1 being the first.

Test 7 (VapourSynth (audio test 5+ only)/Avs+ 64bit dll)
Test 6 (VapourSynth (audio test 3-4 only)/Avs+ 64bit dll)

For you poor avisynth users it sets two variables: BASCHANNEL_LAYOUT and BASVALID_BITS that can also be prefixed if needed
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VapourSynth - proving that scripting languages and video processing isn't dead yet

Last edited by Myrsloik; 2nd August 2020 at 14:10. Reason: New version
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Old 8th January 2020, 11:18   #2  |  Link
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Many thanks !

First test: Maybe I understood channel mapping wrong...
Decoding a spoken 6ch (5.1) .wmv test file seems to deliver one single channel's source content mapped onto all 6 outputs.

AvsPmod waveform() shows it as such.
MPC-BE64 1.5.4.4969 plays the script back and returns "Right surround" on all 6 outputs.
MPC-HC64 1.9.0 plays the script back and returns "Right surround" on all 6 outputs.
Built-in LAV Audio Decoder Status shows 6 sychronous channels.

Same content as .aiff: same result.
Same content as .ac3: same result.
track=-1 and track=0 deliver the same.

After switching the same script, same sources over to LWLibavAudioSource:
Testing .wmv, ac3, aiff: All audio channels mapped correctly.
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Last edited by Emulgator; 8th January 2020 at 11:26.
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Old 8th January 2020, 13:29   #3  |  Link
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Nicely tested. New build with fixed output uploaded. There's also a new argument called exactsamples you can set to true if you want opening files to be really slow but for some reason need a completely sample exact length.

A VS version will follow shortly after the worst bugs have been dealt with.
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Old 8th January 2020, 14:52   #4  |  Link
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I just too lazy to install avisynth, so waiting for the fist VS build to test it out.
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Old 8th January 2020, 22:46   #5  |  Link
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Since sources now hosted on github, I've built doodle1 and bas on my end and tried to run some mp4 file with it. VSPipe simply refuse to initialize environment in portable mode. So I tried to replace dlls/pyd files and core folder. Now VSPipe silently crashing for audio nodes and errors out
Quote:
Script evaluation failed:
Python exception: 'NoneType' object has no attribute 'set_output'

Traceback (most recent call last):
File "src\cython\vapoursynth.pyx", line 2233, in vapoursynth.vpy_evaluateScript
File "src\cython\vapoursynth.pyx", line 2234, in vapoursynth.vpy_evaluateScript
File "R:\test_audio.vpy", line 6, in <module>
clip.set_output()
AttributeError: 'NoneType' object has no attribute 'set_output'
for video nodes.
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Old 9th January 2020, 01:03   #6  |  Link
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The issue I have, I have a 4 hour long video and I loaded it into the script to play on mpc. When I jump to the middle while playing, mpc just kept on loading and never play. I closed the player after 30 seconds.
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Old 9th January 2020, 01:26   #7  |  Link
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Quote:
Originally Posted by lansing View Post
The issue I have, I have a 4 hour long video and I loaded it into the script to play on mpc. When I jump to the middle while playing, mpc just kept on loading and never play. I closed the player after 30 seconds.
It uses linear decoding to be sample accurate so it is quite slow when you do that. (quite a few caching tricks and multiple decoders are used to hide it when seeking but initially it'll always be sloooooow)
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Old 9th January 2020, 13:17   #8  |  Link
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I just realized that I forgot to put embeddable python into my portable folder, now it at least initialize. NoneType error and silent exit from BAS still present.
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Old 9th January 2020, 13:27   #9  |  Link
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Quote:
Originally Posted by DJATOM View Post
I just realized that I forgot to put embeddable python into my portable folder, now it at least initialize. NoneType error and silent exit from BAS still present.
Completely uninteresting. As I said the VS audio support is only about 80% done so not ready to use at all. Don't scare away the avisynth monkeys this source actually works for.
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Old 9th January 2020, 13:56   #10  |  Link
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Ok, sorry. I didn't knew it's that immature.
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Old 10th January 2020, 00:41   #11  |  Link
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BestAudioSource test2: Success !
.aiff, .wmv, .ac3: 6 channel 5.1 files are returned in their order.
.MTS: 2 channel 2.0 files do work as well
Only short files tested for now. Other rare formats to come soon.
Many thanks !
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Old 10th January 2020, 14:05   #12  |  Link
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Quote:
Originally Posted by Emulgator View Post
BestAudioSource test2: Success !
.aiff, .wmv, .ac3: 6 channel 5.1 files are returned in their order.
.MTS: 2 channel 2.0 files do work as well
Only short files tested for now. Other rare formats to come soon.
Many thanks !
I think the most interesting things to try are (in order):
1. Badly combined transport streams with timecode discontinuities. (as in, is the initial estimate of the number of frames actually accurate enough or completely off?)
2. Streams with audio format changes (audio format changes are handled by simply dropping the bits with where the format doesn't match the output)
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Old 25th January 2020, 16:44   #13  |  Link
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Updated version. Fixes the channel mask variable that was previously almost always wrong in Avisynth. Also adds VS support (for a soon to be released test build).
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Old 10th April 2020, 04:14   #14  |  Link
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nevermind
EDIT: Sorry, I thought it is ready for Vapoursynth and on the top of that I did not notice I am in Avisynth forum.

Last edited by _Al_; 10th April 2020 at 05:19.
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Old 11th May 2020, 08:41   #15  |  Link
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Hi Myrsloik,

Question, are the "adjustdelay" and "varprefix" parameters the same as FFMS2? I see "varprefix" is only for AviSynth.


From FFMS2 docs:
Quote:
int adjustdelay = -1

Controls how audio delay is handled, i.e. what happens if the first audio sample in the file doesn't have a timestamp of zero. The following arguments are valid:

-3: No adjustment is made; the first decodable audio sample becomes the first sample in the output.
-2: Samples are created (with silence) or discarded so that sample 0 in the decoded audio starts at time zero.
-1: Samples are created (with silence) or discarded so that sample 0 in the decoded audio starts at the same time as frame 0 of the first video track. This is the default, and probably what most people want.
Any integer >= 0: Same as -1, but adjust relative to the video track with the given track number instead. If the provided track number isn't a video track, an error is raised.

-2 obviously does the same thing as -1 if the first video frame of the first video track starts at time zero. In some containers this will always be the case, in others (most notably 188-byte MPEG TS) it will almost never happen.
Quote:
string varprefix = ""

A string that is added as a prefix to all exported Avisynth variables. This makes it possible to differentiate between variables from different clips.
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Old 11th May 2020, 09:02   #16  |  Link
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Quote:
Originally Posted by Reel.Deel View Post
Hi Myrsloik,

Question, are the "adjustdelay" and "varprefix" parameters the same as FFMS2? I see "varprefix" is only for AviSynth.


From FFMS2 docs:
Yes, they're the same. With the important difference that adjustdelay isn't actually implemented yet.

Obviously varprefix is only needed when you dump it all into a global namespace...
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Old 13th May 2020, 05:41   #17  |  Link
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Thanks for the reply Myrsloik. I guess now we wait patiently till the next update
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Old 13th June 2020, 13:08   #18  |  Link
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New version posted. If you're nice forum monkeys and test my VapourSynth audio builds I may be convinced to add 24bit bit audio output for Avisynth as well as some other minor improvements.
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Old 13th June 2020, 15:36   #19  |  Link
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Quote:
Originally Posted by Myrsloik View Post
I may be convinced to add 24bit bit audio output for Avisynth as well as some other minor improvements.
Arh but, will it be XP compatible ?
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Old 13th June 2020, 17:20   #20  |  Link
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Quote:
Originally Posted by StainlessS View Post
Arh but, will it be XP compatible ?
Hahahahaha.... no.
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