Video TabOn the video tab, you may view the properties of your source video, as well as set image, frame and movie options.
Input/OutputThese fields describe the unalterable properties of your source video:
- Format: This is the format of the source media.
- Frame Rate: This is the number of video frames per second in the source media.
- Color Depth: This value indicates the number of colors in the source video.
- Dimensions: The dimensions are the width and height of the source video.
- Duration: The length of the source video (minutes:seconds).
Output Frame OptionsUnder the heading "Output frame options", there are two settings: average image quality, and, apply smoothing.
- Average image quality: This value, set on a scale of whole numbers from one to 100, reflects the image quality for each frame. You may think of this like saving a .jpeg. The higher the number, the better the image quality, and the larger the file size. This setting does not significantly affect client-side RAM consumption. You may have to experiment to find your ideal setting. We recommend keeping your average image quality below 80%.
- Apply smoothing: This setting is either on (checked) or off. This feature can be used to compensate for some of the pixelation characteristic of photographic image compression. This feature can be more useful at lower image quality percentages (when pixelation increases) or if you apply "Custom SWF dimensions" and stretch your image (see next step).
Output Video OptionsIn the "Video" tab you also set your "Output video options", by choosing your video dimensions, framerate, and, if you choose, a forced-constant bitrate:
- Image Dimensions: this specifies the height and width of each frame image in your SWF. You may use the dimensions used with the presets (in the File tab), or you can enter a whole number between 1-500, or you may select to use your source video dimensions by checking the "Use source dimensions" box.
- SWF Movie Dimensions: By default, "Use custom SWF dimensions" is unchecked, which means that the height and width of the output SWF is the same as the specified image dimensions. However, you may choose to enlarge your SWF dimensions without enlarging your actual image dimensions. For example, let's say your source dimensions are 100x100 and you choose to maintain your original dimensions in your output. That means that each frame is a 100x100 pixel image. Now, let's say that you check "Use custom SWF dimensions" and enter 125 for both width and height. This means that your output still only has the information (and filesize) for a 100x100 pixel image, but it is blowing up each frame by 25% to 125x125 pixels. In this way, you can enlarge your output image without increasing filesize at all, or significantly affecting client-side RAM consumption. The custom SWF dimensions can be a whole number between 20 and 2000.
- Video Framerate: This specifies the number of different video frames displayed per second in your output (and is not your SWF framerate). The higher the video framerate, the smoother the video, and the larger the file size. Also, the higher the framerate, the more RAM the Flash player will consume on the client-side. For this reason, if you are encoding video for higher bitrates, we recommend boosting average image quality and custom SWF dimensions, over significant increases in video framerate. The video frame rate can be a whole number between 1 and 30.
- Maximum Bitrate: The frame and video options directly affect the output file size, but they do not determine a fixed filesize -- that depends on the individual media file. By selecting this box, Flix will drop frame image quality so it doesn't exceed the maximum bitrate, which is especially relevant for 28k and 56k streams. The maximum bitrate can be a whole number between 8 and 512.
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