Scene Detection
Frameline 47’s scene detection functionality (previously called autosegmentation) works by going through each frame of the selected video and compares it to the next, looking for substantial differences, i.e. a camera cut. When the process has detected what it believes to be a cut, it will create a Segment boundary at that point.
When an 'un-segmented' video file (a file with no segments) is first opened in Edit Mode, the scene detection sheet will appear. You can choose to scene detection the entire file then, or choose cancel and bring up tool at any time later again by pressing the Apple + T Keys (See Shortcuts) or from the Menu Advanced / Scene Detection.
Scene Detection Interface
Sensitivity
This slider lets you adjust the amount of cuts that are made. The higher the value, the more cuts that will be made, the lower the value, the fewer. As a rule, the darker the video source, the higher you will need to make the sensitivity. The default sensitivity is 80.
Smallest Segment in Frames
If you are processing a music video that has lots of flashing lights or a strobe, the scene detection routine will consider each of the flashes as a cut, leaving the timeline full of cuts that are probably of little use. To get round this, the ‘Smallest Segment in Frames’ slider enables you to choose the smallest size of Segment that will be automatically created. This functionality works by creating a cut, then ignoring any subsequent detected cuts for the number of frames specified on the slider. So for example, when set at 5, once a cut has been detected, the application will ignore the next 5 frames before it looks to detect another cut.
Target Option
Target Option enables you to Segment files in different ways. With large video files like feature films, it may be a good idea to manually identify the scenes within a film, and then scene detection those scenes into discreet shots. To achieve this, Frameline 47 enables you to only scene detection the currently selected Segment/s. Select a Segment by clicking on a Segment in the timeline. The ‘Next…’ options in Target Options, enables the scene detection of an area of time ahead of the playhead's current position.
Notes on scene detection:
Frameline 47’s scene detection routine does not currently identify transitions such as mixes and wipes, only cuts.
On the recommended System Hardware, the scene detection routine currently performs at approximately 6 X real-time, meaning that a 60 Minute video will take about 10 minutes to process. The process is CPU intensive.
Please Note that with OS X 10.6, there is an issue with Scene Detection with .m4v files, where processing these files is very slow, about 1:1.
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