H.264 Frame Sync Setting
The H.264 encoder in Compressor contains a Frame Sync setting. This setting defines
how often the encoder places a key frame, similar to an MPEG-2 I-frame, in the stream.
The value is in seconds, with one half second increments. The range is from 0.5 seconds
to 5.0 seconds.
The smaller the Frame Sync value is, the more key frames are placed in the stream, which
results in better quality but with a larger file size. Higher values result in a smaller file but
with reduced quality.
The Frame Sync setting does not affect where you can place markers in the Track Editor.
Due to the structure of the H.264 stream, you are able to place a marker about every half
second.