Cause of A/V sync and how recognize when a video has VFR and audio has VBR?

[Stb1990]

My milestone question right there, is so hard to figure that that anyone dont have an answer?, I really want to know and there isnt a single thread in the whole net about that.

Here I have wiki and there explanation of how to know if a video contain VFR..etc.etc http://avisynth.org/mediawiki/VFR , But I still dont get it the way they explain it, and for VBR nothing, this kind of topic are quite discussed around and yet haven�t get an answer reading them.

Is there a software/tool that could help me for that, since using media info, sometime I get this


Audio #2

ID : 2
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Codec ID : A_MPEG/L3
Codec ID/Hint : MP3
Duration : 23mn 9s
Bit rate mode : Variable
Bit rate : 137 Kbps
Minimum bit rate : 32.0 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Resolution : 16 bits
Stream size : 22.7 MiB (13%)
Title : 2ch MP3 Japanese Audio
Writing library : LAME3.97
Encoding settings : -m j -V 4 -q 3 -lowpass 17.5 --vbr-new -b 32
Language : Japanese

And with that I know if there is and prepare myself of further A/V sync problem which this same source is giving, but then there are others source that doesnt even give that information and still I get audio and video synchronization problem, that drive me crazy.

My main intent for know that is figure when Im dealing with it at encoding anime which lately Im getting this A/V sync problem, which surely the VFR and VBR stuff are the cause of all this, I have understood that for VFR there is this diretshow script that goes like
DirectShowSource("%source_file%", audio=false, convertfps=true), and is good for VFR input to directly convert to CRF, but then don�t know when to use it, and for VBR audio aka variable mode...sometime it gives me A/V sync problem, sometime, doesn�t, that is driving me nuts.

Does anyone know what cause the problem, and how to figure if a anime video has VFR so VBR!!?I really really really would be appreciate with you.

[davexnet]

A good place to start is to demux the audio and convert it to CBR - wav/pcm for example. Why complicate things when you're
having sync problems? Then use the new audio as input to your conversion.

If it's still out of sync, try directshowsource2 in your AVIsynth script. See this:
http://forum.doom9.org/showthread.php?t=134275

[Stb1990]

Thanks davexnet for your response, I tried and indeed it helped me a lot but then this problem is happening just right about now...and with all kind of source.

https://forum.videohelp.com/threads/319696-Directshowsource-error-with-StaxRip!!

Any advice of the why this is happening now, uninstalled and installed avisynth twice, and no resolved yet, strange though yesterday I managed to encode with it as sourcefilter, and MeGUI doesn´t give me problem, not the source...not every of my source has such problem. And for convertion the audio to wav, what tool do you recommend? since Vmod give too much problem with mkv sources, not giving me chance but to let it be, any others opinion, goldwave, audiocity?

[davexnet]

Regarding the convertion of audio to WAV, they're are so many programs and packages around, all of us have tried
different programs - I tend to use the programs I'm familiar with as long as it can do what I want with out too much trouble.
You can easily use directshowsource on your simple AVI (with 2-channel audio) and open the script in Virtualdub.
Set the audio to "full processing mode" and use File/Save Wave.

For the scrpts that didn't open in Staxrip - what happens if you open those scripts in Virtualdub ?

You might try simplifying the path and file name and try again. For example,
directshowsource("c:\my_file.mkv")

Are you using the latest Beta of StaxRip ?