tailieunhanh - Digital Video For Dummies 3rd Edition phần 4

Data Rate: Bạn có thể tinh chỉnh chất lượng và kích thước tập tin bằng cách điều chỉnh tốc độ dữ liệu. Để điều chỉnh tốc độ dữ liệu, di chuyển thanh trượt qua lại. Tốc độ dữ liệu thấp hơn có nghĩa là tập tin nhỏ hơn nhưng chất lượng thấp hơn. | Chapter 5 Capturing Digital Video 103 1 Data Rate You can fine-tune quality and file size by adjusting data rate. To adjust data rate move the slider back and forth. Lower data rates mean smaller files but also lower quality. In most cases I recommend you keep the default data rate setting. Include Audio If you only want to capture the video image from your tape and not the audio uncheck this option. MPEG Capture This menu helps you tailor capture to the speed of your computer. The safest option is to simply leave Use Default Encoding Mode selected. If your computer is very fast 2 GHz or faster processor you can make capture more efficient with the Encode in Real Time option. If your computer is slower slower than 1 GHz processor choose Encode After Capturing if you encounter dropped frames or other problems during capture. Preset Sub-preset Figure 5-8 Choose Capture format options here. When you re done setting capture format options click OK to close the Pinnacle Studio Setup Options dialog box. Previewing gour capture settings Pinnacle Studio s Preview capture mode is an excellent tool because it lets you store more source material on your hard disk for editing purposes without using up quite so much disk space. Like MPEG capture if you choose the Preview preset in the main capture window Figure 5-6 and then click Settings you ll have a group of sub-presets to choose from on the Capture Format tab Figure 5-8 . It s usually best to just use one of the sub-presets but if you choose Custom quality you can adjust the following settings 104 Part II Gathering Footage List All Codecs Choose this option to list all of the codecs that are installed on your system. Codecs are compressor decompressor schemes for audio and video described in greater detail in Chapter 14. I really don t recommend using this option because some of the codecs installed on your computer may not be compatible with the Pinnacle Studio .