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US 2008/0165847 A1Published application
Mp4 demultiplexer and method of operating the same
AssigneeLG Electronics Inc.
InventorTae Wook KIM
Life of this patent
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Abstract
Provided are an MP4 demultiplexer and a method of operating the same, enabling an MP4 file to be played in a fast-play mode input by a user, wherein the MP4 demultiplexer extracts all intra-frames (I-frames) among video frames in a sample track of an MP4 file, and the MP4 demultiplexer extracts predicted-frames (P-frames) by skipping, according to a fast-play speed input by a user, at least one P-frame in a succession of P-frames present between the I-frames.
Claims9
An MPEG-4 Part 14 (MP4) demultiplexer comprising:
- a frame-position calculating unit selecting frames to be extracted among video frames of an MP4 file, according to information of a speed at which the MP4 file is to be played, and calculating respective positions of the selected frames based on an address of a start frame of the MP4 file;
- and
- a frame extracting unit extracting the selected frames from the MP4 file based on the calculated positions of the selected frames and respective frame-size information of the selected frames.
A method of operating an MP4 demultiplexer, the method comprising:
- selecting frames to be extracted among video frames of an MP4 file, according to information of a speed at which the MP4 file is to be played;
- calculating respective positions of the selected frames by using an address of a start frame of the MP4 file and respective frame-size information of the video frames;
- and
- extracting the selected frames from the MP4 file by using information of the calculated positions of the selected frames and respective frame-size information of the selected frames.
1 more element
Dependencies are inferred from the claim text.