Mpeg-2 File format

[roy wood]

But for those people whose computers are not up to the job,

My last PC was a P3 600 1GB this one is a P4 2.80 1GB still not a 'Ferrari'
just a skillfull driver eh!!

trying it your way can waste them an awful amount of time and angst -- and often, a lot more than they might otherwise have saved!!!

What to put a few clips on the timeline pop in some Transitions play with a couple of filters add a tune and burn a rewrite disc as an experiment to see if you can save 8GB out of every 13Gb and save on Every Final Render. Well worth the trouble I'd have thought. [/b]

[roy wood]

Wolfgang Qeeried:

(one of the skiing samples provided by ULEAD), and to be honest I couldn't spot a single image in over 8 secs that would be clearer

Sorry youre question got lost during the debate. If you capture from your own camcorder in MPEG and view it frame by frame you'll clearly see the first one the 'I' is clear and the following are fuzzy until you reach the next 'I'.
I haven't kept the 'Ulead' sample you mention but I expect it's a fully rendered commercial file.

[benny74]

Hi all,
i just want to thanks you all for your detailed answers.
few last question:
1. Wolfgang - how you decode into nearly uncompressed AVI
(HUFYUF codec)? with which tool it can be done.
2. all - if i want to convert to avi what is the best (quality of picture)
format? which software you can recomend on to do the conversion? i
guess i should convert the file before i edit it, right?
3. Roy - you said "I do make sure that when I edit, Mpg an 'I frame' is the
first frame, of the retained sequence and I also use a high Bitrate".
can you please explain to me how you do this 2 technic (the I frame
and the Bitrate)? as Wolfgang also tried it with no success. i did the
same but didn't notice any changes. once in how many frames or how
many seconds an i frame is produced?


thanks again to all of you

[roy wood]

Roy - you said "I do make sure that when I edit, Mpg an 'I frame' is the first frame,

Go back and read post no 11 Carefully. All commercial DVDs are produced in MPEG the cameras and equiptment theyand Ulead use we can only dream about if you could see the difference between the frames on the Movies they produce they wouldn't use MPEG. You will however see the difference on the video you capture.

To make sure that VS doesn't continually render your project (losing quality).

(a) Go into 'File'>Preferences> General Tab> put a tick in the box of 'Show message when first inserting video into the timeline' ( When you insert your first clip a message appears "Do you wish to change project settings to match clip" Answer is YES ).

(b)continue down that 'general Tab' page look for 'Playback Method' select 'Instant Playback'

VS will now keep all your Project settings the same as your captured video until you've finished the editing and go into 'Share' to Render and create a video file, that's when the Bitrate is set.
Post back when you get to that stage also read the following it will help you
Ulead VS10+ from Capture to DVD Tutorial with links.
http://phpbb.ulead.com.tw/EN/viewtopic. ... 5784#65784
Ulead VS10+ Tutorial on Capture + Project settings & Procedures.
http://www.jonesgroup.net/media/vsone.htm
Ulead VS10+ Tutorial on DVD set-up & burning
http://www.jonesgroup.net/media/vstwo.htm

[Wolfgang van Ween]

how you decode into nearly uncompressed AVI (HUFYUF codec)? with which tool it can be done.

Benny, Huffyuv (sorry for the earlier misspelling) is a lossless encoder, so it retains the full quality of your video without using up so much space as uncompressed avi.
You can download Huffyuv for free here:
http://neuron2.net/www.math.berkeley.ed ... ffyuv.html

Which tool to use it with? Well, I use Super, but you could equally well do it within VS10+, for instance with the batch conversion tool.

[etech6355]

Benny,
If you want to convert your mpeg to a more editable format then you would use DV-Type1 for VS. You would only convert mpeg files that were recorded in the HQ (HighQuality) mpeg format. otherwise it's not worth converting them. Converting the videos is somewhat advanced and extremely time consuming. Usually you don't have to do this. You simply have to learn how to edit mpeg video properly. If you want to edit your videos then you will need to learn the ins/outs of video editing.

The main difference between DV.avi and mpeg video is DV.avi is a set format. All the parameters & encoding in DV are standard and the same.

Mpeg video is completely different for editing because it has so many different internal video/audio settings. Mpeg's are very versatile encoded video files. The key to editing mpeg video is always make your projects settings exactly equal to your source video settings.

Roy has suggested under "Preferences" to turn on a feature where VS will match the properties correctly and automatcally make the adjustments. This is the "Insert Message when inserting new video etc". You should learn to do this manually anyway because your editing mpegs.

Many people may suggest to convert your videos to dv.avi for editing. I'm sure if you learn the proper method to edit your mpeg videos from your cam you can edit them without any problems.

I would start off using a few video files from your cam on the timeline in mpeg format. Then make sure the project properties equal the source videos. Trim them down or make cuts, keep things simple. Then goto share | Create Video File | Same as Project Settings and render the new video to the harddisk.
Then start a new project (empty timeline), goto Share | Create Disk.
In the Create Disk module insert your exported video you previously created and burn a dvd.
Keep things simple until you get the hang of how VS works.

You should be able to start VS, go directly to the Burn Module and load the videos from your cam (non-edited) and burn a dvd directly. They are already dvd compliant videos. That's the first thing I would do and then learn how to edit mpeg video after making some dvd's.

Use the tutorials in this forums tutorial sections. Experience will be your best teacher.

[benny74]

thank you all
it was realy helpful.
etech6355 - amazing answer - thanks.

[Ken Berry]

Roy -- a comment on your comment on my comment!!!

The point I was trying to make was that for some people, your method simply does not work or causes all sorts of problems, including the dread out of sync audio and video.

When these people strike such problems, they inevitably take hours or days to try to resolve the issue(s). That is what I meant by following your method potentially taking these people much more time than if they followed the alternate method from the start.

[roy wood]

Ken I think we are going to have to agree to differ on this one.
Regards Roy.

[daniel]

Out-of-sync audio is expected to happen and should happen only with compressed audio (MPG or Dolby vs LPCM) and VBR rendering when you (re)move parts of the original video, most certainly if you alter the bitrate.

For constant bitrate it should not happen, and normally not if you keep the bitrate IN i.e. don't recode a VBR, use Smart Rendering.

With VBR recode the GOPs can (Murphy says for important and urgent projects WILL) end up with a different bitrate, BUT the audio is fixed rate and embedded in a stream that is now of a different size! Danger ahead.

If you don't mess too much with the original clip, VS will first separate the audio, encode, then re-embed the audio. That's why it seems to stop between 90 and 91% rendering, that's the audio re-encode.
If you change the audio, it will first start with it (and you wait 10% and the whole progress bar is now off :-) ).


Any specialist is welcome and encouraged to contradict me. I'm ready to learn.