Audio & Video Software forum

Question

Does converting avi 1 to avi 2 lose quality?

by Net_name / May 20, 2012 5:03 PM PDT

1. Will I lose quality if I convert avi 1 to avi 2?

I know programs such as VirtualDub can trim/combine avi without quality loss with an option to "direct stream copy." Does something like this for converting avi 1 to avi 2 exist?

2. I found a program called "Ulead DV converter." Is that something I want? Or is there something better? Will this program lose quality of my avi?

http://www.ulead.com/download/dvconverter/download.htm

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All Answers

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Answer
Subject answer is Yes.
by R. Proffitt Forum moderator / May 21, 2012 1:23 AM PDT

1. Since direct stream copy means no change in avi encoding, then you have to go deeper with the answer. In fact you have to reveal what is AVI 1 and 2.

Since AVI is nothing more than a container and there is no version 1 and 2 I think this discussion falls apart fast.

2. Try the apps you found, test and see if it works for you.
Bob

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Please try again.
by Net_name / May 21, 2012 11:05 AM PDT
In reply to: Subject answer is Yes.

AVI has two formats. AVI 1 which is video and audio combined. AVI 2 is video and audio separate, please know for sure before you claim something on this forum to un-knowledgeable people. Why would you say yes if you believe AVI 1 and AVI 2 does not exist?

Source: http://msdn.microsoft.com/en-us/library/windows/desktop/dd407250%28v=vs.85%29.aspx

Also, your answer for number 2 was very unhelpful.

Sorry to be rude, but I just wanted to point that out to you.

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That's only interleaving.
by R. Proffitt Forum moderator / May 22, 2012 4:08 AM PDT
In reply to: Please try again.

So far, no players today differ over interleaving.

I'm only a designer of many electronics things such as DVRs and until you reveal why it matters if we interleave or not I'm going with this discussion is falling apart fast. You need to get in here and reveal what you are trying to do.

For example, one poor soul was trying to knock around an old AVI file to play on their TV without a PC. They had written pages of details but no one would answer since they never revealed what it is they really wanted to do.

On top of that you omitted "DV" from your top post. I can only guess so much and when you omit the details, most will not be able to help.

In closing, one of our DVRs does indeed re-interleave on the fly as it receives AV data. The reason is technical but I'll keep it simple. We do this so the audio keeps better sync when the user jumps to some time index. It's not perfect but usually is within a few frames.
Bob

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