I've been making a lot of vcds lately from DVD rips off the net. The avi files all play fine, when i convert to mpeg 1, the mpegs play great. When i play the burnt disc on my computer, they also play great. Then, when i play the disc on my APEX AD 703 player, the audio goes out of sync every now and then, but evertually syncs back up. It doesn't bother me that much, but i just really wish i could make these discs virtually flawless. I always extract the wav file with VDub first, and i always choose a good motion search option when encoding with TMPEGEnc. i've also started encoding as high as 1500 kb/sec thinking a higher bit rate would help. it helps the quality a bit, but it still goes out of sync sometimes. I was wondering if i should raise the bitrate more or if there are other settings i could tweak to help the problem resolve. Also is there somethings i could do before i encode to fix this. I really don't want to make SVCDs since i have a slow computer. I do SVCDs for tv shows and they take a long time. Please give me some ideas. Thanks
Mike
+ Reply to Thread
Results 1 to 16 of 16
-
-
You don't say if your making the VCD's fully compliant, by loading a VCD template PAL/NTSC
1500 kb, makes them non standard.
Also just because they play on a PC does not mean there are no problems
You should always scan the AVI's in Vdub first, if there are any junk frames get rid of them before you do anything else.
Since these are DVD rips and may have a VBR or AC3 in the audio, you may need to de-compress the video and the audio before you can scan for junk frames. Sometimes this means saving out the whole thing in full processing mode, not just the audio...
Once the AVI has been verified as junk free, you can now move on to TMPGEnc and a VCD template
Obviously good quality disks are best.
Other things to consider which may not be relevant, make sure you don't have the SMR (Angel portion) codec installed. Make sure you have the DirectShow priority in TMPGEnc set at the top, value of 4 will do just fine. -
thanks for your reply. I started making vcds at the normal bitrate, but then moved the bitrate up in an attempt to try and stop the sync problems i was having. I am curious to learn more about vdubs features. I only use vdub for extracting the wav file from the avi before i encode. You mentioned using full processing mode with the video as well. I haven't heard of this before, could you go into more detail or perhaps point me to a guide that explains pre-encoding steps with vdub. I am also not familiar with looking for junk frames. Thanks,
Mike -
Shame on you, Vdub does a lot more than just save out the audio. You could load an AVI in which was made with a Divx 5.02 codec, and MP3 audio, and save out a new version using DivX
MPEG-4 V3, with uncompressed audio
(If you have codec's) > Nimo codec pack
Video > Full Processing mode (If you have streaming, then you cannot convert)
Video > Compression > Select codec > change settings on codec
Audio > full processing mode
Audio > compression > select codec > (DivX MP3 ?) > change settings on codec
SAVE AVI to save out a new version of the AVI
If no codec is selected (Uncompressed), you can save the AVI with uncompressed audio and uncompressed Video, then there is less chance of problems, but it makes big AVI's if you do this !, sometimes it is a means of fixing a problem.
Take a look at the authors site, it does contain a lot of information.
http://www.virtualdub.org/ -
I may be able to help you out with the audio sync problems you are having with the VCDs you are making. Are you using TMPGEnc's "MPEG Tools..." to cut the final MPEG file in two, so you can make separate discs? If so, this is the problem (it was for me). Use the source range to encode only what you need at any one time - slightly less convenient but guarantees good sync!
Good luck!
CobraDMX -
i do use the source range option, i find it better since i can let tmpgenc make two file instead of one that i need to cut. I think my problem has something to do with the avi file. I'm encoding dvd rips so they might have bad frames of something. i'm looking for ways to use vdub to correct the avi file before i encode. I hear of these things that people do to fix the file, but i can't find guides on how to do what they say.
-
I'm not sure if this will help or not. I had the same problem with my Apex and then started using VCDEasy to make the VCD's and the problem went away. I think it has something to do with scan points or something.
-
Originally Posted by sundi
When you convert, you are converting half at a time, which means you have to be watching for it to finish, to do the second half. I think it would be better to convert the whole movie, then use TMPGEnc again with split/merge to split the mpeg. That only takes a few minuets.
As for fixing problems, most problems with AVI are lip sync and junk frames. Junk frames are not normally associated with DVD ripping, but mostly download glitches and capture dropped frames.
Audio sync can be caused if the DVD rip has a Variable bit rate, or AC3, but is usually cured by saving out the audio in Vdub as a uncompressed WAV at 44.1Khz -
i've also started encoding as high as 1500 kb/sec thinking a higher bit rate would help.
I totally stuffed up two or three VCD movies by thinking "Hey, this movie is only 90 minutes long, so why don't I make the most of the space available on each CDR and increase the quality of each movie by increasing the bitrate?" In my case this was a bad move.
I upped the standard 1150kbps bitrate and even used a program called ADV. DivX BitRate CALCULATOR v1.95 and input the length of the video (45 minutes), then input sound rate (224 kbits/s, Stereo - 28kb/s), input space (1 CD (74min) and the output was Set Video DivX Bitrate: 1748 kBbit/s. I totally ruined them. The DVD player couldn't handle it. The sound was absolutely useless. It was all broken up and truly impossible to put up with. It wasn't just out of synch but totally rooted sound. The video playback seemed okay though.
My stand-alone DVD player is a Pioneer DV-414 and I think it is unable to play SVCD and maybe SVCDs are only VCDs with real high bitrates anyway. If this is the case then my stuffed VCDs might not be totally lost. They may work on a SVCD capable player. (I know little about SVCDs so this is just speculation on my part).
At 1748 kilobits per second I was thinking the processing would take longer but I didn't care. If it takes longer to process but the final result will be superior, then I don't mind waiting.
Someone told me that I should not convert one compressed file (ASF/AVI) directly into another compressed file (MPEG). I must add another step between these. I ought to decompress the ASF/AVI and save it as a huge RAW file (that is too large for FAT32 partition so I made sure my hard drive was NTFS). This RAW file would then be recompressed as an MPEG with TMPGEnc. I'm not sure about the sound though. I'm still working on it. -
Also as another possible cause could be the DVD player. On mine if I fast forward the audio gets out of sync and then catches back up. Only does it on burned ones.
Not only am I perfect but I'm Canadian too! -
Originally Posted by Seamus
Uncompressing and re-compressing "on the fly" is done all the time, no reason why the majority of AVI's should not be don't this way.
No reason why AVI's should no be directly converted without first saving out the audio. Its only when there are are problems with the AVI that you need to start extra work.
If the AVI has AC3 audio, with some people they cannot get TMPGEnc to work with it, some people can. Then there are AVI's with VBR, Vdub will warn you about those saying it may add a skew of X that could give sync problems.
Then there are the dreaded Junk frames, sometimes the audio is just fine but the video is messed up, so converting one of these can also cause a problem.
If the AVI is junk free and audio is none of the above, then TMPGEnc converts them perfectly. It will even handle some junk frames, sometimes causing lip sync at the start of the junk frames.
If the AVI had junk frames and a VBR, then you have no choice but to decompress the whole thing, video and audio, but even then there is no guarantee that while decompressing, that the whole thing can get messed up. -
Yes, I was having some trouble with synchronisation. I tried a "Fixing Audio Synch" approach described here: http://www.divx-digest.com/articles/cutavi.html, but when viewing the final product the sound and video would start to de-synchronise (is that a word?).
I am happy to report that the with the help of TMPGEnc the 19GB RAW video file and the WAV file have been converted to a 438,179 MPEG that was written to a CDRW using Nero Burning ROM. The audio and video appear synchronised.
It appears that when I have an answer to one problem, I am left with questions.In the case of the VCD I just made from an ASF (TIVO) source file, the quality of the final product is inferior to that of a VHS tape, so I am left with another question.
If I am unable to achieve a quality at least equal to a VHS tape, then why bother? For AU$30 I can buy a DVD with two hours of footage, or I could download, convert, and burn this same footage using my own time and resources. I am sure that the quality of the source material must have a significant impact on the final product so I will try converting a few other files and also try to learn how to improve the quality of the final images.
I selected the highest quality Motion Search Precision setting but did not configure the advanced settings. These advanced settings might be the answer.
Thank you. -
Hello, can you help? I am a newbie as well. I tried for the first time yesterday converting an avi file to mpeg for burning as a VCD using the program TMPGENC and it gave me a lot of errors, so I stopped it. The avi file plays file, but... TMPGENC's minimum requirements are P3-500 mhz. My pc is only a p2-333 Mhz. Do you think that is the cause of my errors, and I am wasting my time trying to do this with such an "old" pc? Your help is appreciated.
-
Originally Posted by 5eArt
You cant skip the Vdub frame check, unless you did a DVD rip and know there are no problems. As for the P2, gosh, I use to curse the P3, never tried it on a P2, think it would have done it in a week
So what conversion times are you seeing ?
Try a scan for junk frames with Vdub, and come back in 2 days time to let me know if it found anyjust kidding...
-
Uncompressing and re-compressing "on the fly" is done all the time
Is this what happens when I use TMPGEnc to "convert" an AVI into an MPEG? It is decompressed "on the fly"?
You cant skip the Vdub frame check
Did you say VirtualDub1.3 cannot do a frame check? Maybe I will have to get VD1.4 on my system too. I need VD1.3 for a ton of ASF files. I was told, or I read somewhere that versions of VD newer than 1.3 cannot work with ASFs because Microsoft threatened legal action.
Thanks again KJ. -
[quote]
Uncompressing and re-compressing "on the fly" is done all the time
Is this what happens when I use TMPGEnc to "convert" an AVI into an MPEG? It is decompressed "on the fly"?
[quote]
Yes, TMPGEnc decompresses the AVI from what ever it is, then re-compresses to mpeg. With the correct codec's, the AVI/ASF or anything with AC3 or VBR can easily be converted with TMPGEnc without any problems. LOTR AVI first release has VBR and TMPGENC handled it with no problems.
Not having the right things can lead to all sorts of problems, some people say they cannot get TMPGEnc to work with AC3, others say it wont work with ASF, well if you hit the Browse button to load a AVI, the list actually shows ASF in it !! yet they say it has no support.
TMPGENC will even attempt to convert bad frames, its only when things don't work, that you need to look for problems. I use Vdub for a quick scan, nothing found continue with TMPGEnc. AC3 no problem !
But you need that scan, it is annoying to get to 80% and crash out, just because there are a few frames that it don't like, so its best to scan.
ASF, M$ released 3 particular MPEG 4 code's V 2,3,4 its the MPEG 4 V3 that they did not want anyone to use for AVI, so Vdub 1.3c was the last version to support it. In the early days, the codec was "Locked" you could use it to uncompress (Play) but not use it to compress anything.
At first there was an unlocked version available "Mpg4c32.dll" which would now let you use the codec to make MPEG 4 V3 AVI's. But then M$ prevented the playback of AVI's made with this codec, but then that was fixedSo today it is still used for AVI, and sometimes ASF The Nimo codec pack gives the ability to both playback AVI's made this way, or to make them. If you install original M$ codec's then they will over write those hacked versions and prevent some things from happening.
Anyway, if the ASF is made OK, then you can convert it using TMPGEnc anyway, if it has junk frames, then there is a problem with no scan on older Vdub releases.
I used GraphEdit on a old movie, it was "Song of the south" and recorded in ASF, full of junk frames, but GraphEdit did convert it to AVI, then I was able to remove the junk frames.
Similar Threads
-
Highest compatibility+quality suggestions
By BMemo in forum Newbie / General discussionsReplies: 11Last Post: 30th Jun 2011, 15:28 -
Need Suggestions for a good Camcorder with great sound quality
By techspark in forum Camcorders (DV/HDV/AVCHD/HD)Replies: 32Last Post: 8th Apr 2011, 11:34 -
2 mpg stills: same encode options, vast quality difference ??? (linux)
By jungle5150 in forum Video ConversionReplies: 7Last Post: 26th Jul 2009, 10:14 -
Please, best options for mencoder? (high quality reencodings and no blocks)
By BlooderButcher in forum Video ConversionReplies: 1Last Post: 21st Nov 2008, 13:53 -
Suggestions for improving the quality of this video
By Nightshiver in forum DVD RippingReplies: 7Last Post: 12th Oct 2007, 02:58