Require Advice for Conversion of Videos

[harishkumar09]

You can use some screen recorder to help you, most of them can record video and help you save them to AVI format.

Thanks Jane Smith. Thats a good idea. I think the Open Source alternative would be CamStudio.

[harishkumar09]

Hi Paglamon, I tried doing all the above things you taught me for a DVD movie whose frame dimensions were 720x480. But what I observe is, after applying the watermark filter in VDub, the audio is slightly delayed by a quarter of a second, compared to the video. Well, actually there is a quarter of a second delay in the .avi file I cut out of the .VOB file, and even before watermarking. The lip movements come first, and a quarter of a second later, the corresponding audio is heard.

Also when I took this watermarked .avi file (X.avi) and appended it to small clips containing the credits in the beginning(Y.avi) as well as the end(Z.avi) of the said .avi file(X.avi), the de-synch became even greater. Not only that now the audio was ahead of the video! I heard the dialogues first and almost 5 seconds later the corresponding lip movements. And after the audio ran out and still some video remained, the audio started playing from the beginning. Y.avi and Z.avi which was made of a silent MP3 file did not suffer in any way.

X.avi = main watermarked clip, with audio happening after the video, lagging by .25 seconds approximately.

Y.avi = Beginning credits (silent)
Z.avi = Ending credits (silent)

Y+X+Z = audio heard 5 seconds before the corresponding frames, and playing from the beginning once again after it ran itself out.

Even Y+X = has a audio delay of 5 seconds.

Y and Z inside Y+X+Z were unaffected.

Please help!

[harishkumar09]

I eliminated the delay in the watermarked clip by going to Audio->Interleaving->Delay Audio Track by and entering -250ms. I will call this corrected clip X1.avi

But when I combine this with Y.avi, the file I get still has the audio out of sync, just as before, in fact now it is one more second greater, 6 seconds!

Can you help?

[paglamon]

See what happens if you do this correction with AVIDemux . Does the audio have VBR ?

[harishkumar09]

Ok the massive 5-6 delay eliminated when I realised that the beginning credit clip was 25 fps and the main clip cut from the .vob file was 29.970 fps. I made the credit clip to 29.970 fps by going to Video->Frame Rate (while creating the clip by doing ctrl+c and ctrl+v 50 times for 2 second clip).

But the 0.25 second de-sync does exist in the in the .avi file cut from the .vob file. It is yet to be watermarked. Actually its close to 0.75 seconds.How to get over it? How to sync sound with video when cutting .vob file in Avidemux?

[harishkumar09]

See what happens if you do this correction with AVIDemux . Does the audio have VBR ?

How to do it?

MediaInfo shows Bit rate: Constant in the audio stream of all my files.

[paglamon]

How to do it?

AVIDemux is known to have some A-V sync issues when cutting VOB files.Mpg2Cut2 might be a better choice.

[harishkumar09]

[ATTACH]16135[/ATTACH]

AVIDemux is known to have some A-V sync issues when cutting VOB files.Mpg2Cut2 might be a better choice.

Well you could have said that earlier! And also can use negative or positive values, depending upon if the audio is ahead or lagging behind the video in the Audi Shift box you highlighted?

[paglamon]

Well you could have said that earlier!

Are you complaining ?
I too got to know about this only after you have posted your problem.

And also can use negative or positive values, depending upon if the audio is ahead or lagging behind the video in the Audi Shift box you highlighted?

Yes.

BTW,AVIDemux has a very active support forum. It might be a good idea for you the ask the Qs there.

[harishkumar09]

Are you complaining ?
I too got to know about this only after you have posted your problem.



Yes.

BTW,AVIDemux has a very active support forum. It might be a good idea for you the ask the Qs there.

Sorry, if I sounded rude , but I thought you were an expert in this field.

Thanks for telling me about the forum.

Anyway, I have solved the problem! The reason is when you cut the .avi file, you will see under Audio-->Main Track, it says Audio track 0,337ms shift. I shifted by -337ms and it synchronised perfectly!

[paglamon]

Sorry, if I sounded rude , but I thought you were an expert in this field.

No worries, my friend.It was just a friendly banter
Good to know you have solved the problem.

[harishkumar09]

1.Open the file in Virtualdub
2.Video/Full processing mode
3.Video/Filters
4.In the Filters window click "Add". Then select 'logo'.
5.In the logo filter window specify your logo image.Configure opacity to your liking.If your image has an alpha channel,alpha blending is also possible(I am certainly NOT the best person to tell you about alpha blending,but,it is related to transparency of individual pixels).Click "show preview" and you will see the logo on the video.Position it by choosing X and Y offset and justification(TL=top left and so on).
6.Exit the windows by clicking OK twice and you return to main VD window.Select Video/Compression and configure.
7.Choose Direct stream copy under Audio
8.Save as avi.

Here is a screenshot of a logo on your uploaded file in Virtualdub Output window.[ATTACH]16134[/ATTACH]

If I want to use the logo for only a small part of the clip, how do I do it? If I select a portion of the clip using the "Mark In" and "Mark Out" markers, only that portion of the file is saved as .avi along with the watermark, not the full clip. Please help!

[paglamon]

if i want to use the logo for only a small part of the clip, how do i do it?

[ATTACH]16136[/ATTACH]

[harishkumar09]

[ATTACH]16136[/ATTACH]

Thanks! Did it!

[harishkumar09]

A 3 minute 30 seconds DVD .vob converted to .avi by using XVID codec (through Avidemux) yields a file size of almost 122 MB. Is there any way to reduce the file size by using a different codec?