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does re-rendering degrade video?
boots471
Member Location: Toronto Canada Joined: Oct 08, 2011 16:25 Messages: 65 Offline
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I am currently working on a rather large project, because of it's size I am rendering in smaller chunks.
Once all the smaller parts are completed I want to re-render all of them together.
Will this process degrade the videos that have been rendered already?

Thanks for any tips.
stevek
Senior Contributor Location: Houston, Texas USA Joined: Jan 25, 2011 12:18 Messages: 4663 Offline
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Quote: I am currently working on a rather large project, because of it's size I am rendering in smaller chunks.
Once all the smaller parts are completed I want to re-render all of them together.
Will this process degrade the videos that have been rendered already?

Thanks for any tips.


You are probably going to get about a dozen opinions on this. If your rendering of the short pieces is done with your final target in mind, for instance "mpg2 for a DVD" then no, re-rendering won't degrade the video to an appreciable extent. All the ones and zeros are already in the right place.

But why re-render?

Read up on SVRT. it looks at what you have on the timeline and renders only what needs to be rendered - For instance, the areas between the clips.

You mention a large project. Remember that you can get about one hour of best quality video on a single layer DVD, almost 2 hours on a double layer DVD. If you put all those short videos together and the time exceeds those guidelines, the video will be rendered to fit. The bit rate will be adjusted and you will lose quality.
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.
boots471
Member Location: Toronto Canada Joined: Oct 08, 2011 16:25 Messages: 65 Offline
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Steve
Yes I will Read up on SVRT .
Thank you for the tip.
boots471
Member Location: Toronto Canada Joined: Oct 08, 2011 16:25 Messages: 65 Offline
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But why re-render?

Read up on SVRT. it looks at what you have on the timeline and renders only what needs to be rendered - For instance, the areas between the clips.

You mention a large project. Remember that you can get about one hour of best quality video on a single layer DVD, almost 2 hours on a double layer DVD. If you put all those short videos together and the time exceeds those guidelines, the video will be rendered to fit. The bit rate will be adjusted and you will lose quality.


I looked at the SVRT and a red line shows along the whole project indicating everything needs rendering right?
stevek
Senior Contributor Location: Houston, Texas USA Joined: Jan 25, 2011 12:18 Messages: 4663 Offline
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This is what it says.

What kind of video files are you working with (to start), what kind are you rendering to (the small chunks), and what kind of video files are you finishing with (to)?

What is the final destination for your project? DVD, blu ray disc. etc.? .
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.
boots471
Member Location: Toronto Canada Joined: Oct 08, 2011 16:25 Messages: 65 Offline
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Quote: This is what it says.

What kind of video files are you working with (to start), what kind are you rendering to (the small chunks), and what kind of video files are you finishing with (to)?

What is the final destination for your project? DVD, blu ray disc. etc.?


Steve
These are all avi files I compile a family tree so one chunk is my childhood and coming to canada, another would be meeting wife having kids, another kids growing up, and so on. All together will be to large for my computer so I like to render by sections.
I dont know what the best video file to finish up with? Maybe leave at avi?

Final would be DVD to watch on TV if its to large I have to make part 1 and 2 : two dvd's?

Thanks
stevek
Senior Contributor Location: Houston, Texas USA Joined: Jan 25, 2011 12:18 Messages: 4663 Offline
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You said 'Final would be DVD to watch on TV "

Those AVI file would have to be rendered to mpg2 to put on a DVD that would play on a DVD player.

Render your individual "titles" to mpg2 files and they would not have to be rendered again when you add them to "Create Disc." Read up on Titles and chapters so you get an idea of process.

Remember that you are starting with standard definition files. Trying to improve them beyond the 720 by 480 (or other) might cause them to be degraded.

Sorry, I don;t have any standard definition video files to play with and to try. Perhaps someone else can chime in here. .
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.
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