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Old 5 Nov 2002, 03:40 AM   #1
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Default how do i sync audio when doing anime

Posted a question before about fixing a/v sync in my anime divx files, here and elsewhere, could not get an answer that solved my problem. So, i am starting over.

But how do i make the new divx files of anime DVDs so audio and video are in sync? Audio *always* comes out too fast for the video.

I use Flask. Also have Xmpeg, which i understand is a modified Flask. The two programs offer Frauhofer MP3 and Audio for Divx formats for audio.

I tried using GraphEdit to extract and convert the audio, got the same result. I tried Nandub to do the whole file, still got the audio async. I don't like Gordian Knot because it doesn't let me encode chapter by chapter, which I prefer.
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Old 5 Nov 2002, 08:49 AM   #2
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Here is one method, which works in most cases:
1. Extract audio using Graphedit and prepare an MP3 file out of it
2. Create AVS file in GordianKnot, making sure that all menial tasks (crop & resize, Inverse telecine, subtitles, etc.) are performed
3. Load both AVS and MP3 files into nandub
4. Set Video -> Frame Rate and select "Change so video and audio durations match." Make sure that the video and audio durations are more or less equal
5. Start your encoding routines

Note that I recommended nandub because of its excellent support for MP3s (CBR and VBR). I'm not sure if Virtualdub is capable of this. Unfortunately, this will require you to stick with either 3.11 or MS MPEG4 V2 for your choices of codec, which is not such a bad idea if you prefer these codecs.
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Old 7 Nov 2002, 03:29 AM   #3
mnd
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I use mainly flask/xmpeg for dvd to divx conversion purpose and occasionally other tools. I have also experimented video behind audio issue with my old K6-2 500

Audio synchro depends on your CPU velocity. Decoding the video is more cpu time consuming than audio decoding. To avoid this issue you must reduce the cpu time of the video decoding. Larger is the image, greater is the CPU time for video decoding. For instance with my old k6-2 500 I had to reduce the image size from 720x576 to 592xX to avoid the sound coming out too fast for the video.

With my new Ayhlon XP1600+, this issue has completely disappeared, whatever the conversion tool and whatever the player (with Xmpeg)

On the other hand some players are also faster than others for video decoding. With my K6-2 The Playa, and later Divx Player from Divx.com were between the betters from this point of view.

You may easily try several (free) players and compare them.

Good luck
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Old 7 Nov 2002, 08:04 AM   #4
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Quote:
Originally posted by mnd

Audio synchro depends on your CPU velocity. Decoding the video is more cpu time consuming than audio decoding. To avoid this issue you must reduce the cpu time of the video decoding. Larger is the image, greater is the CPU time for video decoding. For instance with my old k6-2 500 I had to reduce the image size from 720x576 to 592xX to avoid the sound coming out too fast for the video.

With my new Ayhlon XP1600+, this issue has completely disappeared, whatever the conversion tool and whatever the player (with Xmpeg)
The author described that the "Audio *always* comes out too fast for the video," so I think the problem is inherent within the movie file itself. Hence, fixing the method of encoding is a sensible thing to do.

I would also like to add something to my first reply:
"I tried using GraphEdit to extract and convert the audio, got the same result. I tried Nandub to do the whole file, still got the audio async. I don't like Gordian Knot because it doesn't let me encode chapter by chapter, which I prefer."
This is not a problem when you are using Virtual/nandub. The Mark In/Out buttons will allow you to specify where to begin and where to end the video processing, thus achieving the same effect as chapter by chapter options.
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