Frame rate conversion
Description
Framerate conversion is typically used when producing content for devices that use different standards (for example, NTSC vs. PAL), or different content playback scenarios (for example, film at 24 fps vs. television at 29.97 fps). You can set the frame rate for the video output to a value that suits your workflow requirements. You can choose a standard frame rate, such as 29.97. Or you can define a custom rate.
When you set the frame rate, consider the following related parameters:
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The scan type for the output – interlaced or progressive. The choice of frame rate might be constrained by the scan type conversion you apply. For more information, see Converting the scan type.
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Interpolation. The Interpolated parameter has values to favor sharpness or smoothness:
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If Interpolated is disabled, the encoder drops or repeats frames, as needed. This results in sharp individual frames.
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If Interpolated is enabled, a weighted average is applied between frames when new frames need to be added as part of the frame rate conversion. This results in smoother motion. For example, when converting from a 24 fps input to 29.97 fps output, the encoder uses an algorithm to average the 4th and 5th frames of the source content. this produces the additional frame that's needed in the output.
Recommendation: Enable the Interpolated parameter if input and output frame rates are close. For example, 24 fps inputs to 25 fps outputs.
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Location of parameters
This table shows where the parameters mentioned in this section are located. The first column shows the location on the web interface. The second column shows the location in the event XML.
| Location of parameter on web interface | Location of tag in XML |
|---|---|
| Stream – Video > Advanced > Framerate |
stream_assembly/video_description/ stream_assembly/video_description/ where
|
| Stream – Video > Advanced > Interpolated |
stream_assembly/video_description/ where
|
