作者grussy (煮出一杯好咖啡)
看板Final-Cut
标题Re: [问题] 24P转30P
时间Wed Jun 9 06:35:34 2010
※ 引述《web2150 ((  ̄y▽ ̄)╭)》之铭言:
: 推 Naca:我看了一下Premiere的Pulldown pattern,是拆解图场的方式 06/08 22:11
: → Naca:即A,AB,BC,C,D的pattern,通常一般的Pulldown都是如此吧 06/08 22:13
: → Naca:2:2:2:4的方式,可能会感觉顿顿的吧? 不过画面不会闪就是了.. 06/08 22:14
: → Naca:只是我还不知道Premiere做Pulldown要去哪里找选项,没用过... 06/08 22:15
若是指 AA,AB,BC,CC,DD 3:2:3:2 抱歉 我比较没听过这个pattern
目前比较常看到的是2:3:2:3 or 2:3:3:2 这两个pattern
在实际操作时 如果把一段23.98p的素材放置在29.97p的timeline上时
FCP会为了使用较少的processing 而得到最大的real time effect
因而会采用2:2:2:4的pattern 也就是每4 frames repeat 1 frame
会顿是可见的 因为这样的方式是快速的解决 23.98->29.97
FCP手册里面对於2:2:2:4 pulldown pattern的解释
IV-445
2:2:2:4 pull-down An efficient but low-quality pull-down method,
primarily useful for previewing the output of real-time effects on
an NTSC monitor. See also pull-down insertion, pull-down pattern.
IV-426
Step 3: Edit at 23.98 fps
You can edit your footage in a 23.98 fps sequence. To preview your video on
an external NTSC monitor while you are editing, you can choose one of several
pull-down options to convert the 23.98 fps video to 29.97 fps. The 2:2:2:4
option is the least processor-intensive, but it should only be used for
previewing. For more information about real-time pull-down options, see
Volume III, Chapter 28,“Using RT Extreme.”
Step 4: Output back to 29.97 fps NTSC video with advanced pull-down
After you finish editing your movie, you can output back to 29.97 fps
NTSC video by introducing a pull-down pattern on the FireWire output.
You can choose one of several pull-down patterns, either from the RT pop-up
menu in the Timeline or in the Playback Control tab of the System Settings
window. For output back to tape, you should choose advanced pull-down
(2:3:3:2), or normal telecine pull-down (2:3:2:3). You can also export
your movie to a 23.98 fps QuickTime movie or image sequence for delivery to
a video-to-film transfer lab.
看完之後或许有点疑问,我简单列举两种情况
第一种情况 23.98p edit in 23.98p 监视器 29.97
在output到监视器时 需要pulldown
2:2:2:4 是为了预览的效率 而得到最大的RT effect
最後输出 要使用2:3:2:3 or 2:3:3:2
但是请注意 他这边特别写到output to tape 若不是要输出tape的话
其实FCP手册没有写明要怎麽处理 而仅说直接输出23.98 QT Movie或image sequence
第二种情况 23.98p edit in 29.97 监视器 29.97
在放置到timeline上时 需要pulldown
虽然手册并不建议使用2:2:2:4这个pattern 但若要不同timeline base混剪时要有效率
FCP就要用这pattern 也就是必要之恶 除非愿意花时间仔细处理这个问题
但FCP手册并没有很详细地指出要在哪里做调整
Premiere我不是很清楚是否可以不同的timeline base混剪
其他参考资料:
http://en.wikipedia.org/wiki/24p#Displaying_24p_material
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※ 编辑: grussy 来自: 219.71.195.69 (06/09 07:08)