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DPChallenge Forums >> Hardware and Software >> MP4 from AVI
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Showing posts 1 - 11 of 11, (reverse)
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 10/07/2006 04:21:47 AM · #1
Anyone know of a good free AVI to MP4 converter?

I've been doing Photo Presentations on YouTube and they are kinda blurry.

According to their help section:
We recommend the MPEG4 (Divx, Xvid) format at 320x240 resolution with MP3 audio. Resizing your video to these specifications before uploading will help your clips look better on YouTube.

I can get the right size as an MP2 and it looks good on my PC, but after upload it looks funky. AVI files are usually too large to upload... sooo..

Any advice?

Sample: //www.youtube.com/watch?v=pWD3tceoIbw
 10/07/2006 06:38:31 AM · #2
I have no advice, but the cheeseman can sing! Nice job, did you do two takes and edit them together? Sorry just curious and I have no idea about your question. so we'll call this a friendly bump.
 10/07/2006 07:03:32 AM · #3
You should PM Pedro. In this thread he posts an excellent slideshow and somewhere in there he talks about coding. It could be helpful maybe.
 10/07/2006 09:55:13 AM · #4
Originally posted by fotomann_forever:
Anyone know of a good free AVI to MP4 converter?


i've been using a program that converts any video to mpeg4 for my new ipod. seems to work ok, and it's free, so it might be worth trying.

go to downloads.com and search for jodix ipod video... that should find it...

s
 10/07/2006 11:58:24 AM · #5
AVI is a container format, that is, it doesn't define the method by which the audio and video streams that are contained within it are encoded. MP4, by contrast can refer to both the compression method and define the container(a .mp4 file).

So your AVI file can contain a DivX/Xvid encoded file,which are mpeg4 part 2 encoders, within it. The distinction is important because H.264/AVC is mpeg4 part 10, and is getting to be common these days.

Ok, so an easy/free way to re-encode your file, assuming it is not already encoded in mpeg4, and that your system can playback the file. Download the program virtualdub, from virtualdub.org. Download a current build of Xvid, for instance: //www.afterdawn.com/software/video_software/codecs_and_filters/xvid.cfm

Open your existing AVI with VirtualDub. Under the Audio menu, select "source audio". Under the Video menu, select "Compression". Set the compression to the Xvid one. If you need to resize it, under the video menu, select filters. Click the add button. Add the resize filter and set it to whatever size you need. Then ok twice. Then just do a File->Save As, and you will get an AVI encoded as mpeg4.

Now the caveat. For a slide show you may not have to tweak it much, I havne't ever really done a slide show that way. For video though, getting optimum results is something of an art, and usually involves multiple passes, which takes a long time.
10/07/2006 12:47:36 PM · #6
Check out //www.afterdawn.com/software/

Lots of info and free software/links.
 10/07/2006 02:27:35 PM · #7
Originally posted by jdannels:
I have no advice, but the cheeseman can sing! Nice job, did you do two takes and edit them together? Sorry just curious and I have no idea about your question. so we'll call this a friendly bump.


The one where I was singing... I can to cut a pause out where I stopped to scroll my screen :-)
 10/07/2006 02:31:10 PM · #8
Originally posted by colema19:
AVI is a container format, that is, it doesn't define the method by which the audio and video streams that are contained within it are encoded. MP4, by contrast can refer to both the compression method and define the container(a .mp4 file).

So your AVI file can contain a DivX/Xvid encoded file,which are mpeg4 part 2 encoders, within it. The distinction is important because H.264/AVC is mpeg4 part 10, and is getting to be common these days.

Ok, so an easy/free way to re-encode your file, assuming it is not already encoded in mpeg4, and that your system can playback the file. Download the program virtualdub, from virtualdub.org. Download a current build of Xvid, for instance: //www.afterdawn.com/software/video_software/codecs_and_filters/xvid.cfm

Open your existing AVI with VirtualDub. Under the Audio menu, select "source audio". Under the Video menu, select "Compression". Set the compression to the Xvid one. If you need to resize it, under the video menu, select filters. Click the add button. Add the resize filter and set it to whatever size you need. Then ok twice. Then just do a File->Save As, and you will get an AVI encoded as mpeg4.

Now the caveat. For a slide show you may not have to tweak it much, I havne't ever really done a slide show that way. For video though, getting optimum results is something of an art, and usually involves multiple passes, which takes a long time.


Thank you ... that explained a lot to me. I'm kinda a novice with digital video.
 10/14/2006 02:28:15 AM · #9
I use Dr. DivX to convert most of my vid formats. It does a decent job of reducing filesize without losing too much quality. Plus i got some DVD players that recognize the DivX codec, so i can compress movies into itty bitty files and squish about 6 movies onto a single DVD :)

I have used Virtualdub in the past, but had tons of audio/video synch problems. not necessarily a problem with the program...more likely the operator ;)

P
 10/14/2006 03:56:14 AM · #10
i use a great program called iSQUINT to convert any movie to mp4 for my ipod (on my mac OSX). it is very simple (drag, drop, start) and it's a free download.
//www.isquint.org/

Lee
 10/20/2006 08:45:58 PM · #11
Originally posted by Pedro:
I have used Virtualdub in the past, but had tons of audio/video synch problems. not necessarily a problem with the program...more likely the operator ;)
P


VirtualDub doesn't like VBR/ABR mp3 as an audio codec. It sorta can handle it if you tell it not to re-write the audio header. There were historically problems with some of the mp3 encoders that used to be popular, that didn't produce true cbr audio, so you'd get sync drift after a while. VirtualDubMod is much better at dealing with mp3 as the audio codec embedded in an AVI.

For many avi/divx capable players to handle the stream(like the popular Philips DVP-642) you have to disable some of the fancier features of mpeg4. Specifically, QPEL and GMC, or they can't handle it. Newer players can handle qpel and gmc, but it's hit or miss.
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