WinAvi users... or not

[jkapa]

Hi

Having trouble converting avi to dvd with WinAvi. I get audio on the pc but not on the dvd player. In fact it´s worst than that: as soon as the audio starts (after the production screens with no audio) the player freezes.

From this batch the only one that worked is a movie with ac3 audio and winavi with directac3 enabled. The others that have mp3 audio none worked.

Any thoughts on this?


J


PS - I googled this and could only find probs related with a/v sync.

[canadateck]

What model DVD player?..I bet in dosent support Mp3.

[jkapa]

You´re right, it doesn´t.

But it does light up pro logic in the display which is confusing...

To what format does winavi encode the audio?

What software can give me accurate a/v properties (like gspot for vob files)?

[jimmalenko]

GSpot should be fine for identifying most files, or AVICodec.

Yet another reason not to use a 1-click app IMO. Options and flexibility

[jkapa]

Ok according to VDubMod all movies were encoded with 48KHz, 224kbps AC3 audio but I still don´t know audio fps.

All were encoded in 23.976 which (I think) can be a problem since ntsc dvd spec is 29.97 - that´s because I usually set everything in winavi to AUTO and I´ve had good results in PAL - except for one movie which is already 29.97 fps but the exact same thing happens: as soon has the first sounds appears it freezes.

I think it means that it´s audio related but I still would like to see what are the fps on the audio - what software does that?

[jimmalenko]

Ok according to VDubMod all movies were encoded with 48KHz, 224kbps AC3 audio but I still don´t know audio fps.

All were encoded in 23.976 which (I think) can be a problem since ntsc dvd spec is 29.97 - that´s because I usually set everything in winavi to AUTO and I´ve had good results in PAL - except for one movie which is already 29.97 fps but the exact same thing happens: as soon has the first sounds appears it freezes.

I think it means that it´s audio related but I still would like to see what are the fps on the audio - what software does that?

AFAIK there's no such thing as fps on the audio - that's what the 48KHz means - 48,000 samples per second.

[jkapa]

jimmalenko

in gspot v2.21 opening a vob file doesn´t produce any useful results.

avicodec on the other hand produce interesting yet odd results - according to it my videos are all 29.97 (audio same spec as VDubMod).

Which one should I believe?

But more importantly what is the prob with these dvd´s?

[jimmalenko]

in gspot v2.21 opening a vob file doesn´t produce any useful results.

avicodec on the other hand produce interesting yet odd results - according to it my videos are all 29.97 (audio same spec as VDubMod).

Which one should I believe?

But more importantly what is the prob with these dvd´s?

Sounds to me like WinAVI either left your 23.976fps as is and added 3:2 pulldown on playback, OR re-encoded to 29.97fps. Either way, I don't think that's the real cause of this issue.

What happebns when you play the output files off your computer's hard drive (in IFOEdit, PowerDVD or WinDVD) ?

[JayT]

If you load the AVI file into VIRTUALDUB first and then compress the audio to NO COMPRESSION PCM you will find when you put it back into WINAVI you will have sound

[jimmalenko]

If you load the AVI file into VIRTUALDUB first and then compress the audio to NO COMPRESSION PCM you will find when you put it back into WINAVI you will have sound

... you might find that you end up with PCM audio in your end product too, if you're not careful. This takes up HEAPS of space

[jkapa]

jimmalenko

on the pc every movie plays ok
and i´m pretty sure that there´s something besides frequency and bitrate, which i call "audio fps" and is needed to sync a/v

jayt

i´ll try that and post back although I´ve done this before with mp3 and got audio

[jimmalenko]

on the pc every movie plays ok
and i´m pretty sure that there´s something besides frequency and bitrate, which i call "audio fps" and is needed to sync a/v

It's certainly not a standard, I can tell you

You synch audio by making the durations of video and audio match AFAIK.

[jkapa]

I think I know what the problem is: all avi´s have VBR mp3 which can be causing this trouble.

For testing purposes I was thinking of demuxing audio from avi, converting to AC3 with something like besweet and then muxing back to video.

but I´m not exactly sure on how to perform the muxing step... what software and how?



PS - does this mean that winavi can´t deal with vbr mp3?

[jimmalenko]

but I´m not exactly sure on how to perform the muxing step... what software and how?

If you want to demux and then remux back to the AVI, Virtualdubmod would be my tool of choice. If you want to demux, then convert the video stream, then remux in the authoring stage, you'll need an encoding software to output to elementary streams (TMPGEnc Plus, CCE ... or demux WinAVI's output), and authoring software that can accept elementary streams or allow you to specify a different audio stream (TMPGEnc DVD Author, DVD-lab).

Does this mean that winavi can´t deal with vbr mp3?

Quite a lot of encoders/authorers can't so it wouldn't surprise me.

[jkapa]

jimmalenko

I want to demux and then remux back to the AVI using VDubMod.

Any chance you could guide me through those steps since I´m not sure how to do it?

[jimmalenko]

In virtualdubmod, open AVI. Go to streams > stream list, right-click on the audio stream and select Full Processing, then click the Save WAV button. Load this WAV into ffmpeggui and convert to AC3. Go back to Virtualdubmod, select the old audio, press the disable button, click the add button, and add your new AC3 file. right-click on the AC3 stream and go to direct stream copy. Click OK button to exit streams list. Go to video > Direct stream copy. Go to File > Save As ... and save out to a new AVI file. Now your VBR MP3 audio has been extracted to a WAV, converted to AC3 and re-added back into a new AVI file.

[jkapa]

OK. It definetly worked for me.

Enabling directac3 in winavi with the new avi´s already with ac3 audio everything works fine.

But still something puzzles me... when you "save wav" in VDubMod you get mp3 file but when you load it to besweet (that´s what i´m using not ffmpeggui) it recognizes it as wav and the conversion is "wav to ac3".

Could this be bad in any way? The result seems fine.

Thanks everybody for the help especially jimmalenko



J

[funkguy4]

just a side note, i've had problems w/ silent AC3s coming out of BeSweet. and it's probably saying WAv -> AVI because the Save WAV in VDubMod puts a WAV header on it (just like the regular VirtualDub when you Save WAV w/o oing full processing mode.