Apple Compressor 3 - Manual (Page 279)

About Reverse Telecine and Segmented Encoding
Because of the unpredictable nature of the processing when reversing the telecine,
segmented encoding does not work as efficiently as it does when reverse telecine is not
being used.
About Pausing the Transcode Process
If you pause the transcode process, the transcode must start from the beginning when
you restart it.
Creating PAL Video During the Reverse Telecine Process
It is a common practice to convert 23.98 fps or 24 fps video to PAL’s 25 fps rate by speeding
up the playback by 4 percent. If you are starting with NTSC 29.97 fps video from a telecine,
you can convert it to PAL video using two jobs.
• First job: Apply a setting to the job that performs the reverse telecine process and
results in an NTSC frame size at 23.98 fps.
Note: You could apply a setting that also converts the video to PAL; however, the
format conversion will not be done using Frame Controls and may not be of suitable
quality.
• Second job: Create the second job by having the first job selected and choosing Job >
New Job With Target Output. This creates a job that is chained to the output of the
first job. You can now apply a setting that sets the output format to PAL and use the
Frame Controls feature to ensure a high-quality output file.
See About Adding and Copying Jobs for more information about chaining jobs.
Using the Retiming Controls
The retiming controls have two common uses.
• Converting video from one frame rate to another: This typically involves converting NTSC
to PAL frame rates or PAL to NTSC frame rates. This function uses only the setting of
the Rate Conversion pop-up menu and is automatically configured when necessary.
• Converting video to a new speed: This can be a matter of playing the existing frames at
a different rate or, in the case of slow-motion effects, it can require generating
intermediate frames.
In all cases, if the source media file contains audio, the audio also has its speed changed,
with the audio pitch corrected so that it sounds the same as the original, just at a different
speed. This ensures that you will maintain sync between the video and audio.
If you preview a setting that uses retiming controls, the video will play at its new frame
rate or speed, but it will not have been processed by Frame Controls and will be of a
lower quality than the actual transcoded output file will be. The audio is pitch corrected
when the setting is previewed.
279 Chapter 23 Working with Frame Controls