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Old 27th December 2002, 22:10   #1  |  Link
WarpEnterprises
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MPASource: direct MP2 MP3 reading

Hi!

I made an AviSynth 2.0 plugin which can read mp2 and mp3.
(the decoding is based on mpg123 in a version from the lame project)

You simply put

MPASource("filename.mp3", normalize=false)

and get the audio.

Trimming and seeking is supported, although it may be a little slow.

When opening a script the whole file is scanned (fast without normalize, 5x slower with normalize) which can take 20-120 sec for one hour video, but this is the only way to always get the exact sample count (don't use it while preparing the video filters).

MPASource

Last edited by WarpEnterprises; 20th February 2008 at 22:48.
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Old 27th December 2002, 22:18   #2  |  Link
Koepi
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Hu, I can't imagine what it's all good for, but I think the purpose is to feed it with i.e. an avi+it's dewmuxed soundtrack to create a SVCD or something similar.

In that matter, since I only use ogg in ogm (and sometimes find avi+ac3), would it be possible to extend that plugin with that?

Like a general "CompressedAudioSource()"?

Cheers,
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Old 27th December 2002, 22:29   #3  |  Link
WarpEnterprises
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My main purpose is for MP2 source (DVB or SVCD reencoding).
It completely depends on mpg123 and can read only what this líbrary can read.
So I fear it can't.
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Old 28th December 2002, 18:49   #4  |  Link
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As far as I know, DSPguru is planning on making a BeSweet version for AviSynth (BeSynth). That one would do the trick, but I don't know when this will be finished.

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Old 29th December 2002, 15:59   #5  |  Link
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Hi WarpEnterprises,

thanks alot. This is the most useful Plugin that I have seen for a while as a Newbie in avisynth.

Now I am able to cut out the commercials of my DVB caps without pvacut and at the frame I like to, very easy to use, 100 % in sync. Great.

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Old 30th December 2002, 21:35   #6  |  Link
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Compiled a version for AviSynth 2.5
mpasource for AviSynth2.5

Last edited by WarpEnterprises; 10th January 2004 at 00:00.
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Old 31st December 2002, 00:54   #7  |  Link
jcsston
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Nice plugin

Great plugin! Now I don't have to decode and normalize the audio of my TV captures
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Old 31st December 2002, 17:22   #8  |  Link
BaronVlad
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@Warpenterprises:

As you are from Austria, you may be able to read something in German language I have implemented your great plugin in my little DVB guide here:

http://doom9.de/extern_guides/digiCa...de/Inhalt.html

Happy new year.
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Old 1st January 2003, 20:44   #9  |  Link
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Are there sometimes corrupt audio tracks in DVB?
It would be interesting (if this is a common thing) how this could be handled.
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Old 2nd January 2003, 04:38   #10  |  Link
soulfx
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Great plugin WarpEnterprises, this saves me from having to convert my TV caps MP2 audio tracks into WAVS.

It's worked great as far as I can tell. No bugs or crashes to report on my end.

I do have a question though. How can I handle delayed audio? When I demux an audio track with DVD2AVI and I get something that has a delay of 10ms, does this filter compensate for that? Do I need to delay the audio by some other method?
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Old 2nd January 2003, 06:09   #11  |  Link
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You use a script like this
Code:
video = mpeg2source("masterpiece_part3_vd.d2v")
audio = MPASource("MASTERPIECE_PART3_VD MPA T01 DELAY -123ms.mpa", normalize=false)
DelayAudio(audio,-0.123)
AudioDub(video, audio)
This is actually exactly what my small program I made MPEG-2 to VirtualDub does.
Select an MPEG-2 file
Create a d2v project with DVD2AVI commandline
Decode the mpa to wav with MADPlay, use DirectShow Decoder, or Use the MPASource AviSynth plugin
Write a AviSynth script
Open the script in VirtualDub
Download
Put the mpasource.dll in your AviSynth Plugin dir.

@WarpEnterprises: Is it ok for me to distribute the .dll with my program?
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Old 2nd January 2003, 10:56   #12  |  Link
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@jcsston
Brilliant

The simplest way yet to get a normal MPEG-2 into an avi that doesn't need a degree in video processing.

Is there an existing thread/forum to discuss your program - you've made a killer app.

And should be easier/quicker if you use WarpEnterprises plugin

regards

Simon
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Old 2nd January 2003, 19:03   #13  |  Link
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@siwalters
I made a new thread here
I also have an older thread at the 'Unofficial VirtualDub Support Forums' here
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Old 2nd January 2003, 19:43   #14  |  Link
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Quote:
Originally posted by BaronVlad
Now I am able to cut out the commercials of my DVB caps without pvacut and at the frame I like to, very easy to use, 100 % in sync. Great.
Could you post an example script of a cutting you made using mpasource?

Thanks
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Old 3rd January 2003, 17:27   #15  |  Link
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Sometimes there are clicks. To eliminate them I'm currently
using Winamp to convert the mp2 file into a wav using the MAD plugin.
The MAD plugin has a feature to remove this kind of clicks and pops.
Any utility to remove clicks should replace them possibly with silence,
so that audio sync is not lost.

It would be useful if mpasource would handle this automatically.

Thank you anyway. I will be experimenting with mpasource.

Quote:
Originally posted by WarpEnterprises
Are there sometimes corrupt audio tracks in DVB?
It would be interesting (if this is a common thing) how this could be handled.
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Old 3rd January 2003, 17:47   #16  |  Link
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Quote:
Originally posted by onesoul
Could you post an example script of a cutting you made using mpasource?

Thanks
I think this is a misunderstanding.

I have my avs created from GKnot or written on my own and add the audio with mpasource. After this I load the new avs with VDub Mod and cut there. After this compress to divx:

http://doom9.de/extern_guides/digiCa.../Avisynth.html

(example for avisynth script, explanation in German)

DVB and audio: I have a problm with my source (antenna = DVB-T). The most interesting channels have not much power yet and because of this I have damaged mpeg streams from time to time (like a broken SVCD). And then there are also the probs with the audio. But they will fix it in March I think, no other audio problems apart from that occured
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Old 3rd January 2003, 18:25   #17  |  Link
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Oops

I don't want to put down the work being done but wouldn't make more sense to use an universal language, which is english, so that useful information wouldn't spread out for just some guides?

Cheers
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Old 3rd January 2003, 18:41   #18  |  Link
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Quote:
Originally posted by onesoul
Oops

I don't want to put down the work being done but wouldn't make more sense to use an universal language, which is english, so that useful information wouldn't spread out for just some guides?

Cheers
You may be right, but I had not so much time and my "natural born" language is German and i am more active in the german board. There also is an analogue Capture Guide that is waiting for its translation, so everybody who is able to do so, feel free to contact me ! There were some thoughts about that in the past, but that was the last I heard from it somehow. I think the analogue stuff should be done when the VCR function of Joe Redfish is integrated into VDub Mod but however. I would be happy if someone would translate all this.
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Old 3rd January 2003, 21:14   #19  |  Link
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Quote:
Originally posted by cweb
Sometimes there are clicks. ....
It would be useful if mpasource would handle this automatically.

Thank you anyway. I will be experimenting with mpasource.
Could you mail me a short (<2MB) example?

peche at aon dot at.
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Old 30th January 2003, 22:59   #20  |  Link
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hi WarpEnterprises,

let me allow one short question... would it be possible for you to update your great plugin to avisynth2.5 beta ... that would be very nice and highly appreciated...


thanks for your efforts

regards BaronVlad
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