AVIDemux 2.4.1 cutting audio or maybe video sync issue

[ColdFusion2]

Hey All,

OK...the specs:

version 2.4.1 (I see 2.4.3 is the latest) installed from the repo

running Ubuntu Hardy 8.04 up-to-date

I'd love this app if I could sort out this audio/video sync issue.

If I cut from segment A to segment B where segment A is the start of the source AVI file, all is fine. The cutting I save has no audio/video sync issues.

If I do the same, but segment A is after the start of the source AVI file, then the resulting cut segment has it's audio or video out of sync. Now I say the audio is out of sync because once the video starts playing, the voices are about 2-3 seconds ahead of the video. That said, these mid AVI cuttings start (playing in Totem) by showing a green or black frame for a couple of seconds OR show the first frame of the video frozen for 2-3 seconds.

So it could be the video is actually out of sync as it starts with the odd frames or frozen frame. Either way it only occurs when segment A is after the start of the source AVI file.

Any ideas??

TIA

Cheers

[GMaq]

Hi,

Have you tried the "rebuild frames" option in the "Tools" menu? It may help when making cuts. Other than that I'm not sure...My experiences with Avidemux haven't been all it's cracked up to be either.

One of our members here "disturbed1" is quite knowledgeable about Avidemux, If no one else replies you may want to send him a PM.

[ColdFusion2]

Hi,

Have you tried the "rebuild frames" option in the "Tools" menu? It may help when making cuts. Other than that I'm not sure...My experiences with Avidemux haven't been all it's cracked up to be either.

One of our members here "disturbed1" is quite knowledgeable about Avidemux, If no one else replies you may want to send him a PM.

Thanks GMaq,

I've seen the option, but wasn't quite sure when to use it.....perhaps you can help

Typically when I open an AVI, it asks to rebuild the VBR map....and I let it. In some cases it also detects a packed bitsrteam and I let it unpack it.

So.....would I rebuild frames at that point? or do it after I mark A & B markers and then save the video? or save the video and then rebuild?

I suppose if I knew what the heck it was doing I could answer y own question...hehe

Anyways....thanks for the info...and that disturbed might be able to help!!

Cheers

[ColdFusion2]

A quick report back......

I have had success!!

I open the source file as I posted above....let it rebuild VBR and unpack bitstream if required. Then I rebuild the key frames as suggested. Once that's done, cutting works as it should regardless of marker A being at the start of the source file or not.

Now on to testing the AVI to DVD conversion to see how it stacks up against DeVeDe

Thanks again GMaq!!

Cheers

[GMaq]

Hey,

Glad that worked for you! On the AVI to DVD front, DeVeDe is getting better all the time but you may want to check out the Linux version of the HCBatchGUI. It has a GTK interface but requires WINE to run some of the dependent programs (like AviSynth) however it runs very well under Linux and represents the best of both worlds as it gives access to those groovy AviSynth filters that haven't quite been ported to Linux yet. It is developed by "freebird73717" right here at videohelp who is about as accessible and easy to get along with as a developer can be!

Anyway post back on your findings....someone should do a "Linux MPEG-2 Encoder Shootout"!

I would be interested in hearing about Avidemux's abilities in this area.

[ColdFusion2]

Thanks for the heads up on HCBatchGUI.

I've been using DeVeDe since my switch to Linux....and it's been decent. I do still miss SVCD2DVD on Windows though (that's about all I miss from that camp)....it was very good...and very simple to use....well worth the $20 donation

Cheers

[freebird73717]

...you may want to check out the Linux version of the HCBatchGUI. ... It is developed by "freebird73717" right here at videohelp who is about as accessible and easy to get along with as a developer can be!

Aww shucks

Yep I just couldn't live without my HCbatchGUI so I had to write a linux version for it. Some folks prefer the pure nix route but if you don't mind installing wine for the support programs (avisynth, HCenc, DGpulldown) you can get some pretty darn good resulting video and audio files. One thing to note is that HCbatchGUI doesn't author the dvd for you so you will need authoring software like qdvdauthor (personally I run dvdlab through wine). I figure why force the user to a simple menu dvd when they can create their own dvd with menus as elaborate as they like.

[ColdFusion2]

Aww shucks

Yep I just couldn't live without my HCbatchGUI so I had to write a linux version for it. Some folks prefer the pure nix route but if you don't mind installing wine for the support programs (avisynth, HCenc, DGpulldown) you can get some pretty darn good resulting video and audio files. One thing to note is that HCbatchGUI doesn't author the dvd for you so you will need authoring software like qdvdauthor (personally I run dvdlab through wine). I figure why force the user to a simple menu dvd when they can create their own dvd with menus as elaborate as they like.

Hey Freebird....

Well now that I've got you here....hehe

Can you tell me in broad terms how HCbatchGUI compares to something like DeVeDe in regard to ease of use? What I mean is DeVeDe (and SVCD2DVD I used in Windows) were very simple....pick the source...a few options like NTSC or PAL....aspect ratio....and go.

I'm sure there is some quality lost given the simplicity, but at the time I was so new to video conversion it was the best for me....simple...easy...decent quality (I'm no videophile....just wanted to see shows I'd miss or couldn't get in Canada).

So to use HCbatchGUI, do I need to know more about frame rates, audio formats, and so on? or does it also have a simpler default way of dong things?

Thanks in advance....I know it may not be the simplest question to answer....

Cheers

[freebird73717]

Well it's probably not as easy as Devede... but once you get it set up and create a few templates for the encoding then it's not so hard.

HCbatchGUI is an app written primarily for batch processing multiple avi files to elementary m2v video and ac3 audio files. It basically automates the process of multiple programs (HCenc, Aften, DGpulldown) for you.

Yes to an extent you will need to know the frame rates of your files to know whether or not you will need to run dgpulldown for a pal-ntsc conversion. This can easily be found by opening your files in mediainfogui.

It pretty much handles the audio without any major settings. You just need to select the ac3 bitrate and thats it.

The part thats most intimidating to people new to video encoding (creating avisynth scripts) is taken care of for you.

Here is a guide for the linux version. I've written that lays out every step you have to do.
Hmm... there are some pics not downloading. Going to have to look into that.

Here is a guide for the windows version. Both win and nix versions are pretty much the same looks wise to you can get the gist for how it works by looking at these two guides.

If you want to give it a try you can download it here

[ColdFusion2]

Well it's probably not as easy as Devede... but once you get it set up and create a few templates for the encoding then it's not so hard.

HCbatchGUI is an app written primarily for batch processing multiple avi files to elementary m2v video and ac3 audio files. It basically automates the process of multiple programs (HCenc, Aften, DGpulldown) for you.

Ahh yes....used some apps like this back when I first started, but it was too much for me. I think that's because far too much was assumed about what the average user would know. Of course, I know more now....not enough....but more.

Yes to an extent you will need to know the frame rates of your files to know whether or not you will need to run dgpulldown for a pal-ntsc conversion. This can easily be found by opening your files in mediainfogui.

hehe...no idea what dgpulldown does or how I'd know when it's to be used....but I bet your guides below shed some light. I know I've seen pulldown settings before, but never really had to worry about them given the apps I was using....time to learn!!

It pretty much handles the audio without any major settings. You just need to select the ac3 bitrate and thats it.

The part thats most intimidating to people new to video encoding (creating avisynth scripts) is taken care of for you.

Here is a guide for the linux version. I've written that lays out every step you have to do.
Hmm... there are some pics not downloading. Going to have to look into that.

Here is a guide for the windows version. Both win and nix versions are pretty much the same looks wise to you can get the gist for how it works by looking at these two guides.

If you want to give it a try you can download it here

Thanks for the how tos.....when I get a chance I'll get everything in place and play around. Thankfully I have aMUCH faster laptop these days and can run the same file through multiple times with different settings to compare. ON my old laptopo that would take forever...thus using simple tools that were good enough.

I'll be back.....with questions

Cheers