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Media editing system with adjustable source material compression
| Details |
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Inventors: Peters, Eric C.;
Assignee: Avid Technology, Inc. (Tewksbury, MA)
Primary Examiner: Powell; Mark R.
Assistant Examiner: Chauhan; U.
Attorney, Agent or Firm: Wolf, Greenfield & Sacks, P.C.
A media editing system for editing source material comprising digitizing apparatus for receiving and digitizing video and audio source material, the video source material including a sequence of images, each spanning both the horizontal and vertical display axes of the video source material. The editing system also includes computing apparatus including compression apparatus responsive to the digitizing apparatus. The compression apparatus compresses the images from the video source material. The computing apparatus determines if at least one of the compressed images occupies more than a target amount of storage and provides an indication if the at least one of the compressed images does occupy more than the target amount of storage. The compression apparatus is responsive to this indication to adjust its level of compression. The computing apparatus is also for manipulating the stored source material. The editing system further comprises a mass storage responsive to the computing apparatus to receive the compressed video source material and the audio source material, and output apparatus communicating with the computing apparatus to display the manipulated source material. In another general aspect, a data buffer that compensates for differences in data rates, between a storage device and an image compression processor, and a method and apparatus for the real time indexing of frames in a video data sequence. |
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DETAILED DESCRIPTION The media composer according to the invention for editing source material includes apparatus for receiving, digitizing, storing and editing video and audio source material.
Computing apparatus manipulates the stored source material and output apparatus communicates with the computing apparatus for displaying the manipulated material and control information.
The computing apparatus includes JPEG compression apparatus and is programmed so that multiple JPEG resolutions can be displayed, recorded and played back.
In another aspect of the invention, the computing apparatus is programmed to provide motion effects in the displayed material and is further programmed to provide a dial whose rotation rate corresponds to a selected motion effect rate.
Motion effects include forward and reverse variable speed effects, fit-to-fill capability, and strobe motion.
The improved media composer of the invention enables a variety of wipes to be effected, zoom to full screen capability, pitch change audio scrub, graphics positioning and image capture instrumentation.
The system also enables sync point editing and slip sync.
The system also provides for a novel mechanical user interface including a track ball and speed control integrated into a single unit.
Importantly, the system also supports a media consolidation process to free up disk space.
The data buffer of the invention compensates for the data rate differences between a storage device and the data compression processor of a digital image compression and playback unit.
The data buffer interfaces to a host central processing unit, a storage device, a DMA address register, and a DMA limit register, and is mapped into the address space of the host computer bus.
The data sequence is unloaded from the storage device into the data buffer, which is twice mapped into the address space of the host computer.
In a further aspect, the invention relates to an apparatus and method for adjusting the post decompression quality of a compressed image
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Ring Tones 
