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Pegasys Products BBS [ Sorted by thread creation date ]
Hello everybody. I work for an Italian digital-video involved company.
We have a little problem. we have a big amount of AVI to store, and we don't know what kind of compression to choose, we'd like to keep the best quality and the lesser space....
i thought the MPEG-2 could be a good solution, at 1:1 ratio, highest quality..
Well Mpeg-4/DivX will give you as good of Quality and Smaller File sizes than Mpeg-2, But there will allways be some Quality loss anytime you are compressing Video Data but if the Quality of your Source Files is Good the Quality loss should not be Noticeable...
The key to archival decision is what "lesser space" means. MPEG2 can do excellent compression at 8Mbs, "very" lossless compression at 12-15 Mbs and extremely lossless (4:2:2 using MP@HL) at about 18Mbs. This consumes less space than DV, at much better quality. Broadcasters routinely use 15Mbs 4:2:2P@ML to digitize their older archives.
I have used MPEG4 (Divx 5.0.3) but can never get a compressed result which is indistiguishable from the original for EVERY frame, even at 8Mbs. As soon as you get away from an I frame, the quality goes down.
Remember, the underlying compression of both techniques is the pretty much the same. MPEG4 just ads effects to trick the eye into overlooking compression artifacts for very long GOPs when viewed at full frame rate (in tiny computer windows).
If the AVI originally came from DV (4:1:1), it must be archived with 4:2:2 color sampling to prevent half the color samples from being lost during conversion.
Choose know frames from original and compressed videos which have NO motion. Extract out to BMP files (DVD2AVI, vfapiconv, VirtualDub copy frame to clipboard, paste in Paint, save).
Toggle rapidly between BMPs in a picture viewer. The toggle should not be noticeable. Carefully check many pattern types in several frames.
Compare highly zoomed views of an area which has subtle textures.
If resolution is lost in frames with no motion, reject the compression method.
After passing that test, motion can be evaluated but this just boils down to a well known bitrate vs quality judgement.
I've already picked system video and audio but when the encoding is done the video is blank and all you can hear isthe audio so could I please get some help please the movies are AVI from Kazaa if that helps any
thanks for taking your time to help me out!
Jason and Vivian Yang
First Make sure you have the Right Codecs installed, if you do then go to "Options" to "Enviromental Settings" to "vfapi Plugins" and Raise the "Direct Show" to "2"..and if you do not see an image in the Screen while you are encodeing then there will not be an Image in the File....
I need to split an existing 1.2 gig mpg video and am a little new to video editing but lately 1 gig + videos have been showing up and I just don;t have a dvdrw yat... What would be the appropriate settings to split a 1.2 gig mpg then make 2 svcd's? Thanks for the help
I've never used TMPGenc before... i tried it a few times this morning like the the help lage @ vcdhelp.com displays and for reasons i'm unaware of the split first half of the video regardless of where I set the divide markers is consistantly 17mb and not a byte larger...??? Any ideas?
I have several avi's that tmpgenc seems to have a problem with. This happens whenever I use the wizard. As soon as I choose the input video file it says 'Judging Field Order' , then after only 2% I get 'floating point error'. I tried these same files without the wizard and I don't have too much of a problem but do still occasionally get the 'floating point error' only it is usually somewhere during the encoding process.
Any ideas?
Floating Point errors are usually caused by Errors in your Source File, this is common with Downloaded files cuz they usually are riddled with errors that can cause the encoder to Error out or crash..There isn"t much you can do about it in Tmpgenc, you can try scanning for errors and makeing a copy of the file with Virtual Dub this can sometimes fix the errors in the file....
I captured some NTSC TV programs on mini DV tape. I plan to convert these tapes to VCD. The VCDs will be played on a NTSC TV. The original footage was telecined.
I used TMPGENC wizard: First I selected "VCD 29.97 fps" and then checked the "Inverse Telecine" box. The resulting file looks choppy when viewed on a TV.
1. Did I make the proper TMPGENC selections? Should I have selected "VCD 23.97 fps"?
2. Will the file look better on a TV if I do not choose "Inverse Telecine"?
How do you know the original footage was telecined if it was TV footage?
In any case you cannot use IVTC on this footage and even if you did you cannot just leave the frame rate at 23.976 fps after IVTC.
You would still need to re-telecine this material to make it NTSC compliant.
You can only IVTC original progressive material which has been Telecined. You have lost the original progressive frames by capturing to 29.97 interlaced frames.
You need to encode this footage at 29.97 fps.
Ashy - you asked "How do you know the original footage was telecined if it was TV footage?"
Answer: When I view the captured footage frame-by-frame, I see a repeating pattern of three progressive frames followed by two frames with interlace artifacts.
I will encode the captured file at 29.97 fps.
Here's another question: When I encode at 23.976 fps and burn a VCD, how does my DVD player output 29.97 fps? Would I get the same jerky motion if I used SVCD?
>Answer: When I view the captured footage frame-by-frame, I see a repeating pattern of three progressive frames followed by two frames with interlace artifacts.
If this is indeed the case then you may be able to use IVTC on this material.
After IVTC does this material play ok on the PC?
If so encode then encode this material to MPEG2 using pulldown.
Ashy - you asked "How do you know the original footage was telecined if it was TV footage?"
Answer: When I view the captured footage frame-by-frame, I see a repeating pattern of three progressive frames followed by two frames with interlace artifacts.
I will encode the captured file at 29.97 fps.
Here's another question: When I encode at 23.976 fps and burn a VCD, how does my DVD player output 29.97 fps? Would I get the same jerky motion if I used SVCD?
>Answer: This plays very smooth on a pc. It's only jerky on a TV.
If this is the case then it seems the footage has been properly IVTC'd
The 23.976 VCD setting you refer to is for Film material, but most hardware players will not play this material correctly moreover most players will convert the frame rate to 29.97 causing frame rate conversion artifacts such as jerky playback.
In most cases for playback on a hardware player the VCD has to be 29.97.
Only when encoding to MPEG2 can the framerate be set to 23.976, but 3:2 pulldown must also be used to make the MPEG play at the required 29.97 fps.
I want to convert videofootage, shot with a PAL camcorder, to NTSC format and burn it on DVD so it can be played in countries where they use this NTSC tv format.
The question is: Can I capture this (PAL) footage directly with Adobe Premiere (with PAL projectsettings) and convert it afterwards to NTSC with TMPGenc? Anybody knows if this is going to work.
Yes and no. You can convert it with TMPG, but the result will be choppy playback. TMPG cant do proper fram rate conversion.
To do it properly you would need to alter the frame rate to 23.976 by patching the headers in the file and then encode to MPEG2 using 3:2 pulldown. This will create an MPEG which is internally 23.976, but will play back at 29.97 fps.
You would then need an audio editor to alter the length of the audio to match the video.
Another way is to use AVIsynth, but the above method is best.
You can probably get Premier to export you Project as Pal or Ntsc, I know that With Vegas Video 4 you can export your Projects as allmost any standard Frame rate no matter what the Original file is, and the Playback allways seems smooth ...
Procoder Does a Lot more than Encode to Mpeg it also Converts between Many Formats and does Exelent Pal/NTSC conversions, it has Better Mpeg2 Quality than Tmpgenc but the Mpeg1 isn"t as good, It all comes down to What you need the Product to do and what kind of money you want to spend, If you just want to make VCD"s and SVCD"s and DVD"s then You are better off with Tmpgenc, But if you are Working with a Lot of Different Formats and DV and Have a Lot of Money to spend then Procoder is the way to go, I use them Both from time to time for different Projects....
On one of my machines, When I encode I get no video in the preview pain, just a black screen. Consiquently the encoded video is also nothing but black. I can watch movies ok on this PC, but for some reason I get no actual picture when I encode them.
The process completes normally and takes the normal amount of time. You can see it counting through the frames etc.. just no picture. I get sound, but thats it.
i have a question, i'm trying to convert an avi file to mpeg so i can burn it. the first part of the movie went through perfectly without any problems...i started it when i went to bed, and when i woke up, it was finished and perfect. but i'm trying to do this with the second part of the movie now (it was over 80 minutes...so two cd's...so two conversions). but now, when i start the encoding, i get a msg that says "run time error, program [tmpgenc.exe] abrnormal program termination". then it closes down, and says "tmegenc caused error in xvid.dll". i mean, it's the same movie, just the second part of it...can someone tell me what's up with it? how do i fix this? the one time i got it to go through, i later on got an error about a floating decimal point. please help.
This problem comes up yet AGAIN! Why is this happening? Last time, I fixed it but finding the error point (I forgot how) and then I used Source Range to record the first half right up to the second before the error point. It worked. Then I went to encode the point after the error point until the end of the video and it worked. Then I merged them together. The result was weird for one second but it was hardly noticeable.
Now for this disk, it's the same thing. I have wasted 4 hours and right at 99%, it closes down on me! My encoded file is corrupt and won't play. Yet it displays normally under VDub. What is the problem here?
Well, I just found out that when I opened the source video file in VDub, it had a VBR MP3 track. Does that change anything? The file with the same problem a while back had no VBR MP3. Oh well, I'll be sure to open VDub everytime now! :) Now let's see if it works if I extract the WAV...
An IRQ is an Interrupt Request line which is used by your hardware devices to send signals to the processor.
It seems like you have some sort of incompatibilty problem affecting IRQ1.
Usually reserved for the System Keyboard Controller.
Go to system information and check for conflicts.
I used to get this error when writeing a lot of data to my hard drive like when ripping a DVD, the Problem turned out to be a defective DMA Controller and had to get my whole motherboard replaced..Not to say that this is your Problem ,Just beware that it can be a symptom of a bigger problem and Not a problem with Tmpgenc...I would do as Ashy said and look for IRQ Conflicts and make sure that too many devices are not shareing the same IRQ...