Video from multiple codecs can clash when edited together. Here's how to avoid that problem.
Once done, launch your video editing program. I've used Adobe Premiere for this walk-through, since it's one of the most versatile, easiest, and cheapest Windows programs for working across multiple file formats.
Make a new project. For high-definition movies select HDV; otherwise, just select DV.
In the next screen, you'll need to pick a preset. For most movies, 720p24 will work; that means 720 pixels progressively scanned at 24 frames a second. That's better than most YouTube videos. It's high quality with a reasonable file size--a good compromise for multiple file formats and great for most editing environments. Also, using 24 (actually 23.97) frames per second will eliminate any issues with dropped frames--for instance, if one source was recorded at 30 frames per second, another at 60, and another at 25, there are going to be problems if you import at 30 frames per second.
Before moving forward, click the "General" tab and select "Maximum bit depth" and "Maximum render quality."
When this dialog box appears, click "OK."
If your editing environment has more than 2 GB RAM, select "Edit--Preferences--Memory" and select "Optimize rendering for: Memory."
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