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Converting from home recorded MPEg-2 to XVID
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jechome
Newbie
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17. January 2006 @ 06:57 |
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Like a recent poster I have been using a LeadTek WinFast 2000 Expert card to record TV. I record into MPEG-2 files at around 6000Kbps (~ 2,5Gb per hour recorded). I have tried numerous ways of then converting and compressing this into XVID AVI.
1) Directly using VirtualDubMod. It works but 1) leaves me with a large AVI file (achieves approx 50% compression) and 2) There are Audio synch problems on longer programs (soundis out bu up to 1-2 seconds)
2) Using a longer and more involved technique (DGIndex to DeMux sound track, VFApi to frameserve final AVI, VirtualDubMod to compress AVI and dub audio track back on). (VirtualDubMod settings used are identical in both methods(i.e. 2 pass). Using method 2 I get much smaller AVI file but still get audio synch problems (even after using the delay figures given by the DGIndex process in setting the audio stream in VirtualDubMod.
I have also used AutoGK and the DivX maker program but always get the audio synch problems.
What am I doing wrong or not doing properly? Please help!
Thanks in anticipation
JEC
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rick5446
Suspended due to non-functional email address
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18. January 2006 @ 14:03 |
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@ jechome..Other then the sync problem how did your AVI's turn out with AutoGK..Quality & size
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jechome
Newbie
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18. January 2006 @ 19:34 |
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Apart from the sync problem, everything else (in all the approaches used) seemed (to my ageing eye) to be fine!. I have to say i have only tried AutoGK a couple of times and haven't really explored the advanced settings (Ctrl F9). I can't remember what resolution settings I went for (auto I think) and i have tried both Target Quality settings (1 pass conversion) and Custim Size (2 pass conversion). I cannot remember what the sizes of the resulting files were just now.
I will try another go to see what results I get.
How might this help my sync problems?
Will update this thread ASAP.
Ta for the interest!
JEC
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rick5446
Suspended due to non-functional email address
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19. January 2006 @ 02:12 |
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@ jechome..By reading your post..I assume you have tried this approach
The quick & easy fix is to re-interleave your AVI, using: probably NanDub would be best
http://prdownloads.sourceforge.net/ndub/nandub-binary-1.0rc2.rar
You need to set both audio and video to 'DIRECT STREAM COPY'.
Then use Save as AVI [F7]..under FILE to save your new AVI..on a diff drive or diff file on same drive
BELOW IS A METHOD FOR OUT OF SYNC AUDIO & VIDEO
You cannot SLOW the AUDIO down, instead you must increase or decrease the video framerate.
For example, if it is standard 23.976 you could change it to 23.984
There will be a recommended framerate listed, which will allow the audio and the video to finish
at the same time (which is what you want :)
But trial & error is the only sure way...
Ideally you will read the AVI from one drive, and write the new file to another.
If you have only one HD, try to read from one partition and write to another.
If you have only one partition, make sure you don't overwrite any files - make a different (destination)
folder.
By manipulating video framerate and advancing or retarding the start of the audio, there is no
messed-up AVI that cannot be fixed, or at least made more watchable
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jechome
Newbie
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19. January 2006 @ 07:35 |
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Thanks for the advice and tips I will give it a go. Do I take it from your reply that once I hit upon a framerate that works, it can be used for all subsequent conversions (or are you saying the trial and error will be required for each conversion!)?
By the way I ran another conversion using AutoGK using all the standard defaults apart from forcing a final file size (ensuring a 2-pass encoding)of 1500Mb. Starting with an MPEG-2 file of 5100 Mb, the resulting file was 1536Mb; quality of the image was pretty good (compared to the original, hope thats useful to you!
Regards
John
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rick5446
Suspended due to non-functional email address
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19. January 2006 @ 11:15 |
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@ jechome..Well glad we were of some help..Get back to us & let us know if it fixed your problem.Or how U FIXED your problem,things of this nature are always helpful
Your second conversion came out well U said..Did U have any sync problems with it..If not then remember what U did different with it,in comparision to the 1st one
On the first one maybe U were trying to do just a little to much on the computer,I know that when U convert frm one format to another,you had best stay away frm your comp till its done!!
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jechome
Newbie
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19. January 2006 @ 21:16 |
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I have the opportunity over the weekend to put your recommendations to the test, I will let you know how I get on.
You asked about the autoGK conversion I did, yeas it worked well (in picture terms they always do!) I still get some sync problems (did i mention these problems are gradual, as in the audio goes out of sync by up to 2-3 seconds over a 2 hour program (fine at the start - out at the end).
Conversions are often done overnight or whilst I am at work, so there shouldn't be much contention!
Regards
john
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rick5446
Suspended due to non-functional email address
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20. January 2006 @ 05:05 |
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@ jechome..Every once in a while I'LL get an AVI file that I've D/L do that.I found that it was not the files fault,but the player.I correct this by just giving the player a short fast re-wind & this seems to correct the problem.It does seem like it only happens in movies of 1 1/2 hrs or more.Now this very same movie in 2 parts [about 750megs ea] on 2 CD's does not have a problem.Just another step for U to try,see if this works for U
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jechome
Newbie
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20. January 2006 @ 23:51 |
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Rick (5446)
I have tried re interleaving the audio as you suggested and it worked for me (didn't realise just how easy it was!)
As I am in the UK my TV source should run at 25fps, knocking this down to ~ 24.997 fps seems to have done the trick.
Many thanks for your help and and advice.
I guess we can consider this thread closed.
Cheers John
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rick5446
Suspended due to non-functional email address
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21. January 2006 @ 04:07 |
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@ jechome..Well just glad it all worked out for U..Just do everybody here at AD a favor..Pass on your experience,along with the problems U were having & how they were corrected.Their are definetly a lot of what if's when fooling around with converting frm 1 format to another
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