Divx / MPEG

[tatayet]

Hi there ... just a simple question to clarify ...

What is the difference between DIVX and MPEG ?

Is DIVX just a video codec that allows the MPEG1, MPEG2, MPEG3 or MPEG4 viedo compression ?
If yes, then what are some other examples of video codecs that can also be MPEG ?

Thanks !

[megamachine]

It's sort of the other way around. DivX (like XviD and others) is a type of MPEG-4. MPEG-1 is used for VCD and MPEG-2 for DVDs, while MPEG-3 is just for audio compression. You can probably Google a site that lays out all the details and specs for them.

[tatayet]

ok, then ...

Suppose I have a 695MB Movie on my Hard disk, that have extension avi.

I understand I could be a DIVx, or not ...

Suppose I want to put it on a DVD (DVD video format).

I understood I had first to pass it through TMpgEnc, and then to DVDShrink, to reduce the size if necessary ...

Why should I pass through TMpgEnc ? Isn't it MPEG already ?1?

[anonymez]

dvd is mpeg-2... that avi file is mpeg-4... there is quite a difference... if you use tmpgenc to encode to mpeg-2, you shouldn't need to use dvdshrink, as tmpgenc is quite good when it comes to final file size

[megamachine]

The file you have seems to be MPEG-4, encoded with DivX compression and saved with the file extension AVI (which is just a container for any one of a number of formats). To play this movie on a stand alone DVD player, you need to convert it from DivX (which is MPEG-4) to MPEG-2 (which is required for DVD playback). TMPGEnc can do that for you, but it will increase the file size considerably, to anywhere from 2-4GB. As long as it's under 4.3GB, you can then author that MPEG-2 to DVD structure (using something like TMPGEnc DVD Authoring, a different program) and add menus if you wish, and then burn it to a DVD. However, if the authored DVD structure comes out over 4.3GB, then you need to shrink it. Now, if the original film is 70 minutes or less, you can try conveting your DivX (which is MPEG-4) to MPEG-1 (which is used for VCD), and then burn that to a CD. The quality of MPEG-1 is not as good as MPEG-2, and if it's longer than 70 minutes, you need split it to two CDs. Hope this helps.

[tatayet]

Thanks for the reply.
Tjhe file I have has an avi extension, and seems to be a Divx.

When trying to open it with TMpgEnc, it is asking for the Video, and Audio source files.
When selecting my avi file, it tells me "Can not open, or unsupported".

I have the same problem for different Divx files I have on my computer.

P.S. : I can read the movie without any problem using Media player, for example ...

any idea ?

[setarip]

"When selecting my avi file, it tells me 'Can not open, or unsupported'"


1) Load the original .AVI video file into VirtualDub (or one of its many variants) or NanDub

2) From the "File" dropdown menu, select "File Information"

3) Post (here) EVERYTHING you see (BOTH video and audio information), or post a screen capture .jpg of the information box

[Soulhunter]

Originally posted by megamachine

...while MPEG-3 is just for audio compression.

Dont wanna sound "wisenheimer" but...

Something like MPEG-3 does not exist !!!


Probably you mean MP3...

But MP3 is part of MPEG1 !!!

Its real name is:

MPEG1 - Audio layer version 3


Bye

[setarip]

To Soulhunter

"Dont wanna sound "wisenheimer" but...
Something like MPEG-3 does not exist !!!
Probably you mean MP3..."


I hate to burst your bubble, but the full name of ".MP3" is "MPEG Layer-3"...

[Soulhunter]

Ehm, still think its -> MPEG AUDIO Layer v3 !!!

And it is really part of the MPEG1 audio specs...

Even if the Fraunhofer guys say its MPEG2 , the MPEG guys say its MPEG1 !!!


Hint:

Mostly the "1" of "MPEG1" is omitted !!!

Same with movies...

You dont say Terminator 1, you just say Terminator !!!

And the "v3" isnt wrong as well...

Coz its indeed the 3rd version of the MPEG1 audio layer !!!


So, spec wise: ISO-MPEG1-AUDIO-LAYER-V3 !!!


Bye

[tatayet]

OK, here are the results :

Virtualdub :
When trying to open the avi file, I get the following message :

Couldn't locate decompressor for format 'DX50' (unknown).
Virtualdub requires a Video for Windows (VFW) compatible codec to decompress video. DirectShow codecs, such as those used by Media Player, are not suitable.

So, should I get a codec pack ?
which one is the best codec pack ?

Thanks !

[tatayet]

OK, here a good news.
I installed K Lite codec PAck, and now TMpgEnc is able to start processing my movies.

for 2 of them, If I stop the encoding after a few minutes, I have the sound and picture, wich is good !

for 1 of my movies, I only have picture, and no sound ?!?

Virtual Dub is giving the following info about that movie :
VirtualDub has detected an improper VBR audio encoding in the source AVI file and will re-write the audio header with standard CBR values during processing for better compatibility ...

After accepting the message, here is the Audio info it is giving :
Sampling rate : 32000Hz
Channels : 2
Sample precision : N/A
Compression : Fraunhofer IIS MPRG Layer-3 codec
Layout : 136005 chunks (0.05s preload)
Length : 55405980 samples (1:21:36.25)
Min/avg/max/total frame size : 252/407/864 (54108 K)
Data rate : 91kbps (5.56% overhead)

any idea on why TMPGEnc is not handling audio for that ifle ?

[megamachine]

Not sure, if it handles the other "MPEG-3" audios, it should handle that one. Or do the other vids not have MP3 audios? By the way, if you use VirtualDubMod, you have the option to say no to that VBR question, since yes sometimes results in audio skew.

[setarip]

Converting .AVIs with VBR-MP3 Audio for use with TMPGEnc

Using VirtualDubMOD (DIfferent than "standard" VirtualDub) to Convert "VBR" .MP3 to Uncompressed .WAV

1) Load the .AVI file into VirtualDubMOD (a different program than the standard VirtualDub)

2) From the "Video" dropdown menu, select "Direct Stream Copy"

3) From the "Streams" dropdown menu, select "Stream List" - and rightclick on the audio stream, then select "Full Processing Mode" - then click on "OK"

4) From the "File" dropdown menu, save .AVI with a new filename

[tatayet]

I guess I could also havo done that vith the "standard" VirtualDub, right ?

If I understand well, I'm re-working the audio stream, correct ?