Mpeg4 editing (2)

rayn

New member
I've come across a frame-accurate mpeg4/avi editing tool that I'd like to share with all VideoReDoers. It's called avidemux ( http://fixounet.free.fr/avidemux/ ). It's freeware and handles all mpeg4 streams (as well as opening and converting to mpeg2). As with VDub, it doesn't install, it just unzips to it's own folder. If you're just cutting stuff out (adverts etc.) and saving to the same format it will only re-encode the frames around the cut-points (like VRD), so is pretty quick. It has a whole array of filters when you are re-encoding and I can't believe it hasn't been mentioned or discussed before; I only stumbled across it in a thread on the AfterDawn forums.
 

stony

New member
I tried this one out because I had an AVI that contained a commercial that hadn't been removed. I have used VDub several times in such a situation.

The resulting file played on my PC but not on my player (a MediaGate 35), with the audio proceeding while the video stuck on a frame. I repeated the operation without success.

VDub did the job successfully using direct stream copy. I may have been imagining things but both files (VDub and Avidemux) seemed to suffer from a very slight jump in both audio and video. I think that we are still in need of an accurate editor like VRD when it comes to AVI.

But I will try using Avidemux again when next an annoying ad pops up.
 

laserfan

New member
I've come across a frame-accurate mpeg4/avi editing tool...it will only re-encode the frames around the cut-points...I can't believe it hasn't been mentioned or discussed before...
Wow rayn, I can't believe it either, and I hang-out at a lot of the av forums. Never have seen it--nice catch! I'm gonna give it a try the next time I have to repair an Xvid conversion where I deleted the original MPEG2 recording.

The "frame-accurate" aspect of the program I found discussed here as "SmartCopy":

http://www.avidemux.org/admWiki/index.php?title=Cutting
 

Lester Burnham

New member
One other thing to note about avidemux - it can also convert AVIs to other formats - like mpeg / DVD.

Bit of a quiet gem, really.
 

Lester Burnham

New member
Too bad it's been poorly named; maybe a key reason for its relative anonymity.
Well as to the naming thing, a lot of these things get named as to their initial purpose, and other things evolve over time.

And then, renaming could be confusing or misleading for people already using it.

At the end of the day, it's freeware, so attracting a huge following may not be that important for the author.

I think it's cross-platform, too - which does indicate how much of a gem it is, really.

It's kind of ironic, really, because I've used it in the past (for manipulating AVIs), but have been using it quite recently for conversion of avi (mpeg4) to mpeg2 / DVD-Video.
 

stony

New member
I guess, as usual, I am the odd one out. As I have said, the only time I have used avidemux it has failed miserably. I therefore don't see it as a gem. Well, not yet anyway. I can't see its advantage over VDub for simple AVI editing. And, as I said, I am still looking for an AVI editor that is as classy with AVIs as VRD is with MPEGs. I definitely detect a slight falloff with AVIs resaved in VDub, but no such problem with MPEGs resaved in VRD.
 

phd

Super Moderator
I guess, as usual, I am the odd one out. As I have said, the only time I have used avidemux it has failed miserably.
Don't feel bad. I couldn't get it to work either.
 

Lester Burnham

New member
I guess, as usual, I am the odd one out. As I have said, the only time I have used avidemux it has failed miserably. I therefore don't see it as a gem.
What's it failed at?

There are support forums for it - did you ask any questions there?

Well, not yet anyway. I can't see its advantage over VDub for simple AVI editing.
Frame accuracy.

Can be done with virtualdub, using Cut Assistant, too.

And, as I said, I am still looking for an AVI editor that is as classy with AVIs as VRD is with MPEGs. I definitely detect a slight falloff with AVIs resaved in VDub,
Not with direct stream copy.

but no such problem with MPEGs resaved in VRD.
Nor should there be with Virtualdub (with, or without Cut Assistant) or avidemux.

We wouldn't likely be having this discussion if VideoReDo edits mpeg4 AVIs, but as it doesn't, currently, clearly other solutions are being used.

And both Virtualdub and AVIdemux are both freeware, and from my perspective, work very well - and in the case of virtualdub, is kind of the cornerstone of many video manipulation functions.
 

phd

Super Moderator
I tried just a simple format conversion using the default install. Since it was mentioned on this forum, I wanted to check quickly if it was a useful tool out of the box.
 

Lester Burnham

New member
I tried just a simple format conversion using the default install. Since it was mentioned on this forum, I wanted to check quickly if it was a useful tool out of the box.
And what happened?

Surely if it didn't work, there was some kind of error message?
 

phd

Super Moderator
No. It created files that wouldn't play in anything and gave an error in the players.

To be a usefull tool, after selecting the video output option, It should automatically list just the audio output formats that are compatible rather than have the user select each one by trial and error.
 

Lester Burnham

New member
No. It created files that wouldn't play in anything and gave an error in the players.

To be a usefull tool, after selecting the video output option, It should automatically list just the audio output formats that are compatible rather than have the user select each one by trial and error.
"compatible" though is kind of a vague thing, isn't it?

Rather like AutoGK and it's standalone compatiblity options.

Some tools require more knowledge and aforethought than others - but in doing so, often provide more options in terms of capabilities.

In fairness, it's not equitable to damn freeware on not being the most simplistic tool ever.

A lot of video work (encoding, converting etc) can be based on trial and error - and in doing so, tends to be the whole way in which we learn. If I'd simply used tools that required no learning curve, or trial and error, when I'd first started doing video work, then I'd be a lot worse off now, in terms of knowledge.

And as I said, let's not forget this is freeware - developed and provided simply for (probable) personal development and the good of the community.

I'm not suggesting it's the be-all and end-all where conversion is concerned - but it's certainly competent - I've used and experimented with a number of other tools, the reason why I praised it, is because it does what it's name implies, plus a number of other things - and for free.
 

pwantzel

New member
One advantage to AviDemux over VirtualDub is that it can handle variable bit rate MP3 audio without creating audio-video sync issues. I've not found a way to do this in VD except by a cumbersome workaround (converting audio to CBR or separate .wav file, editing, and then converting it back).
 
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