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Extra info for Manuale Adobe Premiere Pro Tecniche Di Compressione Video Ita

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Unlike other codecs, it’s safe to run the VP3 codec in Quick Compress mode by default. Still, if the time is available, encoding with this mode inactive guarantees the best quality and most accurate data rates possible. VP3 has a more complex keyframe insertion mode than most codecs. Not only can you set a threshold, but you can specify the minimum and maximum number of keyframes. The default settings for Threshold and Minimum work well for most projects. If your video includes very fast editing, you might want to set a lower minimum, and if you’re working with very high frame rates, you can set a higher maximum.

Note that the bit rate VBR mode has a more limited data rate range of 48-192 Kbps, but it offers CBR, which can range from 5 to 320 Kbps. Also, the quality-limited VBR mode doesn’t provide a full 0-100 range, but it offers a few discreet options in the codec data rate pop-up menu. There is a 0 Kbps option for WMA9 CBR as well. 1 used prior to Windows Server 2003. Intelligent Streaming for that server requires each file to have one and only one audio track, so the 0 Kbps option provides a way to have an audio-free file.

The ability to use the next I-frame gives a small, but welcome, improvement in compression efficiency, but it makes random access a little more complex because each GOP is not wholly self-contained. For DVD authoring, Open GOP is fine except for multiangle titles. Multiangle titles need Closed GOPs and need to have all the I-frames align among the angles to provide smooth switching among angles. MPEG-2 audio codecs While there are default MPEG-2 audio codecs, most implementations use other codecs.

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