- 第 2 页 -
通过这个问题学到了很多东西，再转来一个帖子大家看看
http://www.jdbbs.com/viewthread.php?tid=1749313&extra=&highlight=%CA%B2%C3%B4%CA%C724P%C4%A3%CA%BD%3F&page=1
另外，在搜索学习过程中，也发现大多数人并不知道24P与电视场之间的严重问题，奇怪的是，DVD时代全球所有厂商都集体漠视了这个问题，可能是技术上达不到或者试图等待电影界改换制式。但电影界至今还是雷打不动的24P（实际是48P），最终，终端界低头了，开始生产直接支持24P播放的设备了。
我试图搜索电脑显卡的HDMI是否支持24P输出，未得到满意答案。
然后再看看这两个帖子：
http://www.highdefforum.com/computers-htpcs/74708-24p-120hz-computer-lcd-monitor-i-give-up.html
http://www.avsforum.com/avs-vb/showthread.php?t=967710
[ 本帖最后由 黑毛 于 08-11-24 03:57 编辑 ]
http://www.jdbbs.com/viewthread.php?tid=1749313&extra=&highlight=%CA%B2%C3%B4%CA%C724P%C4%A3%CA%BD%3F&page=1
另外，在搜索学习过程中，也发现大多数人并不知道24P与电视场之间的严重问题，奇怪的是，DVD时代全球所有厂商都集体漠视了这个问题，可能是技术上达不到或者试图等待电影界改换制式。但电影界至今还是雷打不动的24P（实际是48P），最终，终端界低头了，开始生产直接支持24P播放的设备了。
我试图搜索电脑显卡的HDMI是否支持24P输出，未得到满意答案。
然后再看看这两个帖子：
http://www.highdefforum.com/computers-htpcs/74708-24p-120hz-computer-lcd-monitor-i-give-up.html
http://www.avsforum.com/avs-vb/showthread.php?t=967710
[ 本帖最后由 黑毛 于 08-11-24 03:57 编辑 ]
再转一篇文章，看来电脑还是有希望的。
The State of 24p Playback on a Home Theater Computer
To get the best video quality playback possible for movies in a home theater, it's necessary for the refresh rate of the source component to match the refresh rate of the display. One of the most common problems stems from the fact that most movies are 24 frames per second while most televisions are 60 frames per second (approximately.) It's not a simple mathematical conversion to get 24 fps to scale to 60 fps. There are processing fixes (reverse telecine) to overcome this problem, but the frame rate of the source material must be properly detected and the proper correction applied. The best solution is to send the original untouched 24 fps signal from the player, through the receiver, and on to the display, where the frame rate can be doubled / tripled / quintupled without any skipping or judder.
The problem for users of Home Theater Personal Computers (HTPCs) is that there are very few hardware combinations that will properly pass the original 24 frame/second signal digitally to the receiver/display; the video drivers don't support 24 Hz output properly. One obvious example of this is the latest motherboards with the Intel G45 chipset. There is a setting in the HDMI video drivers for 24p, but the resulting video has noticeable jerks/pauses a couple of times a minute, apparently due to the driver improperly matching the output frame rate with the input frame rate.
Nvidia 9300 and 9400 chipsets - the first solution for HTPC 24p
The only exception of which I'm currently aware is motherboards based on the new nVidia 9300 and 9400 chipset. Multiple sources have confirmed that 24p playback is flawless over HDMI. Several vendors, including Asus (P5N7A-VM) and Gigabyte (GA-E7AUM-DS2H), have just released motherboards based on these chipsets.
(I plan on upgrading both of my HTPCs to the Gigabyte motherboard. Since Protected Audio Path is no where on the horizon, I see no need to wait. Surprisingly, this is the cheapest upgrade I've done, because the motherboard contains everything I need for video, audio, and Blu-ray video decoding and I can use my existing CPUs, RAM, hard drives, cases, and power supplies.)
The downsides of 24p on a HTPC
The downside of setting the output of the HTPC to 24 Hz is that not everything is recorded at 24 Hz. Television shows are at 60 Hz. So if you're watching a movie, you select 24 Hz and if you're watchined recorded TV or TV on DVD, you select 60 Hz. This is not automatic; you manually have to make these changes youself. So while a bottom-of-the-line Blu-ray player can automatically switch to the correct frame rate, an expensive and highly flexible HTPC cannot.
The simplest way to change the frame rate is to go to the video driver control panel and make the appropriate setting. But this is not very elegant for a HTPC. Instead, it possible to assign shortcut keystrokes to each resolution and map those to your remote control. This is a pain to setup, but it means that a press of the button switches between the two.
Theoretically, it's possible for a program such as My Movies to store the appropriate framerate for each movie / show in its internal database and issue the appropriate "change video refreash rate" command when each is played, but I don't think this is a supported feature yet.
What about 120 Hz?
A lot of flat panels advertise their 120 Hz refresh rate. This is the output video refresh rate of the panel itself, not the input refresh rate. The highest-possible refresh rate that is supported by HDMI is 1080p/60 Hz. No source component (HTPC or stand-alone DVD or Blu-ray player) can output 120 Hz over HDMI.
Conclusion
If you want a perfect video frame rate with no jerkiness or stutters over HDMI, it is possible on a HTPC using the latest Nvidia chipset. However, you manually have to change the output refresh rate of the video card, and knowing the correct framerate of the source materail is not intuitive. This is the price you pay for having a beautiful browesable for instant movie playback.
The State of 24p Playback on a Home Theater Computer
To get the best video quality playback possible for movies in a home theater, it's necessary for the refresh rate of the source component to match the refresh rate of the display. One of the most common problems stems from the fact that most movies are 24 frames per second while most televisions are 60 frames per second (approximately.) It's not a simple mathematical conversion to get 24 fps to scale to 60 fps. There are processing fixes (reverse telecine) to overcome this problem, but the frame rate of the source material must be properly detected and the proper correction applied. The best solution is to send the original untouched 24 fps signal from the player, through the receiver, and on to the display, where the frame rate can be doubled / tripled / quintupled without any skipping or judder.
The problem for users of Home Theater Personal Computers (HTPCs) is that there are very few hardware combinations that will properly pass the original 24 frame/second signal digitally to the receiver/display; the video drivers don't support 24 Hz output properly. One obvious example of this is the latest motherboards with the Intel G45 chipset. There is a setting in the HDMI video drivers for 24p, but the resulting video has noticeable jerks/pauses a couple of times a minute, apparently due to the driver improperly matching the output frame rate with the input frame rate.
Nvidia 9300 and 9400 chipsets - the first solution for HTPC 24p
The only exception of which I'm currently aware is motherboards based on the new nVidia 9300 and 9400 chipset. Multiple sources have confirmed that 24p playback is flawless over HDMI. Several vendors, including Asus (P5N7A-VM) and Gigabyte (GA-E7AUM-DS2H), have just released motherboards based on these chipsets.
(I plan on upgrading both of my HTPCs to the Gigabyte motherboard. Since Protected Audio Path is no where on the horizon, I see no need to wait. Surprisingly, this is the cheapest upgrade I've done, because the motherboard contains everything I need for video, audio, and Blu-ray video decoding and I can use my existing CPUs, RAM, hard drives, cases, and power supplies.)
The downsides of 24p on a HTPC
The downside of setting the output of the HTPC to 24 Hz is that not everything is recorded at 24 Hz. Television shows are at 60 Hz. So if you're watching a movie, you select 24 Hz and if you're watchined recorded TV or TV on DVD, you select 60 Hz. This is not automatic; you manually have to make these changes youself. So while a bottom-of-the-line Blu-ray player can automatically switch to the correct frame rate, an expensive and highly flexible HTPC cannot.
The simplest way to change the frame rate is to go to the video driver control panel and make the appropriate setting. But this is not very elegant for a HTPC. Instead, it possible to assign shortcut keystrokes to each resolution and map those to your remote control. This is a pain to setup, but it means that a press of the button switches between the two.
Theoretically, it's possible for a program such as My Movies to store the appropriate framerate for each movie / show in its internal database and issue the appropriate "change video refreash rate" command when each is played, but I don't think this is a supported feature yet.
What about 120 Hz?
A lot of flat panels advertise their 120 Hz refresh rate. This is the output video refresh rate of the panel itself, not the input refresh rate. The highest-possible refresh rate that is supported by HDMI is 1080p/60 Hz. No source component (HTPC or stand-alone DVD or Blu-ray player) can output 120 Hz over HDMI.
Conclusion
If you want a perfect video frame rate with no jerkiness or stutters over HDMI, it is possible on a HTPC using the latest Nvidia chipset. However, you manually have to change the output refresh rate of the video card, and knowing the correct framerate of the source materail is not intuitive. This is the price you pay for having a beautiful browesable for instant movie playback.
恩,确实,平时我们注意力集中在画面ZhongYang或主体, 没注意边角部分, 我试了标清的画面,边角部分一样眼晕(这个好象还和画面内容有关,象这样的黄土地最容易犯晕),感觉这个象人眼焦距对不准,实际也应该是这样,摄象机镜头在边角区域,尤其是和主体不在一个距离上时,焦距是不准的,画面也就模糊了,是否这时人眼试图对准焦距,但同时画面主题又影响着焦距导致大脑犯晕??
但23楼的视频和下面这个视频问题应该是不同的
"看这个视频前面一点摇移镜头，就是我说的那种画面移动不匀速的感觉。
http://www.tudou.com/programs/view/27r7sJQv890/"
后者是明显的停顿,即使在画面主体ZhongYang部分,感觉是桢率不够产生的停顿感. 我特地找同事借了个1080P的BBC地球系列,BD RIP, 但是29.97的桢率, 网上没查到象这个BBC地球系列原始用多少桢率拍的.就这个看的感觉没停顿感,但瞅着边角看是犯晕.
哦,刚发现一个问题,摇移镜头,如果边角区域的物体和ZhongYang区域在差不多的距离上,是不会出现眼晕问题的,只有在边角和ZhongYang区域不在一个距离,而且边角区域相对移动速度快得多的时候,才眼晕. 同时还看了Living.Landscapes.-.The.World's.Most.Beautiful.Places.Blu-ray.MPEG2.1080p.DD.5.1.DISK1.ts, 情况是一样的.
但23楼的视频和下面这个视频问题应该是不同的
"看这个视频前面一点摇移镜头，就是我说的那种画面移动不匀速的感觉。
http://www.tudou.com/programs/view/27r7sJQv890/"
后者是明显的停顿,即使在画面主体ZhongYang部分,感觉是桢率不够产生的停顿感. 我特地找同事借了个1080P的BBC地球系列,BD RIP, 但是29.97的桢率, 网上没查到象这个BBC地球系列原始用多少桢率拍的.就这个看的感觉没停顿感,但瞅着边角看是犯晕.
哦,刚发现一个问题,摇移镜头,如果边角区域的物体和ZhongYang区域在差不多的距离上,是不会出现眼晕问题的,只有在边角和ZhongYang区域不在一个距离,而且边角区域相对移动速度快得多的时候,才眼晕. 同时还看了Living.Landscapes.-.The.World's.Most.Beautiful.Places.Blu-ray.MPEG2.1080p.DD.5.1.DISK1.ts, 情况是一样的.
不管在画面的什么位置，只要是移动速度快的，就会有停顿感。
我们在看电影的时候，一般主体都保持在画面的中间位置，虽然背景在动，但是主体基本没动，所以不会感觉有停顿。
这个跟我在拍摄时也是一样的，尽量不要让画面的大部分都运动，要不然画面抖得厉害（因为大部分画面都在运动的话，其实就是没有主体了，这时人们的视觉没有焦点，所以很容易察觉到停顿）。当然这里的抖并不是24P的关系，而是25P、29.97P相对于快速的画面已经不够用了。
24P是不均匀的抖动，25P和29.97P是匀速抖动（等支持24P的显示设备出现，那也就变成匀速抖动了）。
[ 本帖最后由 张俊 于 08-11-27 00:47 编辑 ]
我们在看电影的时候，一般主体都保持在画面的中间位置，虽然背景在动，但是主体基本没动，所以不会感觉有停顿。
这个跟我在拍摄时也是一样的，尽量不要让画面的大部分都运动，要不然画面抖得厉害（因为大部分画面都在运动的话，其实就是没有主体了，这时人们的视觉没有焦点，所以很容易察觉到停顿）。当然这里的抖并不是24P的关系，而是25P、29.97P相对于快速的画面已经不够用了。
24P是不均匀的抖动，25P和29.97P是匀速抖动（等支持24P的显示设备出现，那也就变成匀速抖动了）。
[ 本帖最后由 张俊 于 08-11-27 00:47 编辑 ]