Frage von ThomasSch:
Keep in touch!
Using the example of HDV over FireWire:
The camera takes on HDV onto tape. GOP! So I-frame and then only changes .... I frame every 17 frames.
Now in such biste FinalCut and want to shoot frame 2:12 to 4:03. (capture)
2:12 is not a degree I-frame. What happens now?
I think the camera is running s.dem closest previous Iframe.
Is now virtually a new I-frame based on 2:12, adapted to the rest, and s.dem next I-frame on tape is next completely normal? or is everything starting up in new point?
Either way, what does this mean for the video quality?
Any ideas?
merci
Antwort von WoWu:
Thomas,
This is not explained in three words, but an editing program based s.ganzen GOPs and always makes the preview of what makes each decoder, it expects the GOP out of us because it represents as frames.
If a cut now between two I-frames, is an additional I-frame and creates a shortened Gop and stored as a bridge file that is inserted behind when playing the stream. The playback is first and foremost, only the processing of a pointer list to the original files or the Bridge-Files.
Now there is in each GoP but two B-frames that refer to the previous GoP and s.einem sectional images could show the rest who have nothing to do with the cut. (stray B-frames)
Programs that behave differently. Some live with the failure to remove it other B-frames.
One way or another but lost s.der provide information for proper composition. One will hardly notice. Theoretically, it is limited but the quality s.der place.
The quality of the GoP shortened the bridge is always dependent of the quality from the used encoder. But because in the last 10 years in any case nothing has been improved to MPEG2, you can assume that there should be no noticeable differences in the quality MPEG2 encoders more.
