Audio disappears after conversion into AVI ????

[plomon]

After ripping all the chapters from the DVD using DVD Decrypter(1GB splitting), I used AutoGK for encoding the VOBs into AVI.

I gave the input folder consisting the VOBs and IFO file along with a notepad(holding the stream information) --> this is what is exactly stated in the AutoGK Guide by dap & js.

After the entire conversion is over, two AVI movie files are generated(2 CD splitting option selected in AutoGK).
Now, when I started playing the files, no sound is coming..the audio is totally disabled.

I don't understand what's happening at all. But, one thing I can say...when I encoded a single chapter using the same method through AutoGK, then the encoded file played well along with the sound. this is weird to state. but, this is what happened actually.

anyone, pls solve my problem.

[manono]

Hi-

You can open the AVI in GSpot and confirm that the audio is really in there.

I suspect that the audio is AC3, and you need to install the AC3Filter. I also suspect that the reason you got sound when doing a chapter of the movie earlier was because the audio was MP3.

Just educated guesses.

[plomon]

both the rips (the full rip and chapter rip) ofcourse belong to ac3 audio only. but, one worked and the other did not.

i can add a point here....while the encoding process went on...the progress is periodically shown in a small window in the AutoGK....so, over here...i found a small warning message (while running the first pass) saying like this :

Warning! Found different number of frames: 206121

This warning message appeared while the encoding the full movie(i.e., all chapters). Since, I can't stop the encoding process in the middle, I allowed it to continue, and unfortunately faced the problem of lost audio after the entire encoding process is over.

Now, since the encoding process is expected to be same whether it's a small VOB file(i.e.,when a chapter is ripped) or a bigger VOB files(i.e., when the entire movie is ripped into two VOBs each 1GB), I checked out the messages being disaplayed in the AutoGK for the entire encoding process of the smaller VOB file. strangely, these messages have no warnings in between any of the activities being performed during the encoding process.

The messages being displayed in AutoGK are stored in a temporary text file for every encoding process.

Check out the picture below to see the difference of generated information between the two files, at the bottom part of the file(coz until then the information remained the same) :



this is a guess i'm making about the cause for the problem.

[plomon]

well, i guess the audio is enabled after the ac3 filters are installed...so, u'r idea worked manono.... now, can u suggest what do i do (i mean what conversions should i do) to play the movie on windows media player(without the help of any ac3 filters).

i guess i have to demux the avi file into .m2v and .ac3 files...convert the .ac3 file into mp3 amd multiplex it back with the .m2v video file. if this idea is correct, then suggest the suitable software for implementing the idea and also suggest any changes to be made in the idea(in case it leads to loss of video/audio quality)....or else....simply suggest a new idea of u'r's, pls.

currently, the video and audio quality are at their very best...so, i don't want to lose that quality.

[manono]

Hi-

now, can u suggest what do i do (i mean what conversions should i do) to play the movie on windows media player(without the help of any ac3 filters).

Since there's no AC3 filter that comes included with Windows, then you'll have to install something to get it to play. I understand that ffdshow has an AC3 filter included, but I've always just used the standard AC3Filter. Otherwise, if you don't want to have to install an AC3Filter (don't know why you wouldn't), then don't make the audio AC3. Make it MP3. You can do that in the Advanced Settings of AutoGK. When making 2 CD rips with AutoGK, the default audio is AC3.

convert the .ac3 file into mp3 amd multiplex it back with the .m2v video file

Yes, get the AC3 back out of the AVI. If you still have your AutoGK files, you should have a demuxed AC3 file already. But one way or the other get the AC3, and convert it to MP3 using BeSweet or HeadAC3he. You might find HeadAC3he easier to learn if you've never used either before. Then mux the MP3 back into the AVI (not .m2v). Of course, converting the AC3 to MP3 will lead to a loss of quality, but with high bitrate MP3, you might not be able to tell the difference. The video will remain unchanged. Good luck.

[plomon]

u told : "mux mp3 in avi"....how do u do that....coz avi is already included with an audio format.....do u mean to say, after demuxing....mux the mp3 with demuxed .m2v to get a new avi file...if so, what is the tool which can mux mp3 with .m2v to get an avi file ??

moreover...i want to make a vcd out of this avi obtained....how can i do that....nero isn't accepting the avi file, coz it says that MPEG-4 decoding is not available with it(i guess XviD encoded files cannot be docoded by nero)....so, give any better idea to make a VCD out of the (XviD encoded)AVI file(s).

alternately, if i use TMPGenc to mux the mp3 file with .m2v file, can i get the MPEG video file with the same video/audio quality that XviD previously provided while encoding. i'm asking this as nero accepts mpeg files without any problem for making VCDs

[manono]

Hi-

u told : "mux mp3 in avi"....how do u do that

I use Nandub. You can also use VDubMod or AVIMuxGUI, and maybe some other tools.

coz avi is already included with an audio format.....

It's easy to replace the old audio (AC3 for you) with new audio (MP3 for you).

if so, what is the tool which can mux mp3 with .m2v to get an avi file ??

Stop saying .m2v. That's a different format. An AVI contains MPEG-4 video.

moreover...i want to make a vcd out of this avi obtained....how can i do that....

You should have done that directly from the DVD in the first place, rather than make an AVI. However, you can use DVD2SVCD for the job, as well as other apps. Look around in the guides section of this site.

can i get the MPEG video file with the same video/audio quality that XviD previously provided

Not if you're making VCD, you can't. VCD is garbage, as far as I'm concerned. In any event, this will require reencoding. VCD is MPEG-1, and your XviD AVI is MPEG-4. Different video formats.

[mats.hogberg]

DVD -> AVI -> VCD is a bad idea. Each format conversion intruduces a drop in quality. Much better to do DVD -> AVI and DVD -> VCD if you want both AVI and VCD versions of your DVD.

/Mats

[plomon]

i tried to make a vcd by adding the obtained AVI file to the nero video list. the file is added with a warning message saying that mpeg-4 decoding is not available with it.

however, i thought of giving it a try and continued with burning the VCD. unfortunately, after the VCD is made, and when i played, video is present , but there was no audio. the audio is again disabled.(remember: ac3 filters still exist on my pc)

my doubt is--> has the audio been disabled

1.) because nero was unable to decode an mpeg-4 file format present in the original AVI(if so, why is the video working properly)

or

2.) is it because the audio format in the orig. avi file is ac3.

i mean to say, if the avi was encoded using mp3 audio, and then used to make VCD, would the VCD work(along with audio) ???

if, it doesn't, then i see only two ways:

1.) Encode the VOBs into AVI(with either ac3 or mp3 audio) and watch the movie in the same format to ensure quality, but do not attempt to convert this AVI to VCD
or
2.) Demux the VOBs into m2v and mp3(or ac3) and multiplex them into mpeg-1 movie using TMPGenc. now, make VCD out of this file.

pls suggest which is the best thing to do. if none of the above two methods is good, suggest u'r own idea....but, my final aim is to watch a high quality movie on a vcd.

[mats.hogberg]

Like I said:
First of all, if you want a VCD, don't create an AVI.
Second, don't involve Nero in anything video related. It's pretty good at writing stuff to disc, let's leave it at that.
In my VCD days, I used DVDx for DVD to VCD conversions when I was feeling lazy. Pretty good, pretty simple. The interested pupil may go on reading here.

/Mats

[plomon]

is there any software which can maintain the perfect aspect ratio and of video and the quality after conversion from AVI to MPEG(VCD compliant)

The softwares i already tried do not give the required quality. these softwares are:

1.) DVD2VCD
2.) DVDX
3.) TMPGenc
4.) Blaze Media Pro
5.) EazyCD

If there is any other software(apart from the above mentioned) which can give the exact quality in mpeg(vcd) like that of an avi format, then pls suggest it. if there are none, then, i'll simply forget converting avi to mpeg. i'm quite satisfied with avi although it's not useful in making a vcd.

[mats.hogberg]

If there is any other software(apart from the above mentioned) which can give the exact quality in mpeg(vcd) like that of an avi format, then pls suggest it. if there are none, then, i'll simply forget converting avi to mpeg. i'm quite satisfied with avi although it's not useful in making a vcd.

No, there isn't. Besides the fact that each reencode to a "not lossless" format (like mpg, DivX et cetera) lowers the quality, VCD is the lowest quality format ever intended for TV playback. Even when it's as good as it gets, it's low resolution, and low bitrate.

/Mats