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Editing of encoded A/V sequences

A sequence and encoding technology, which is applied in the direction of record carrier editing, electronic editing of digital analog information signals, color TV parts, etc., can solve problems such as time hindering user editing

Inactive Publication Date: 2005-07-20
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this technique on traditional data processing equipment such as a PC, using primarily software-based encoders would take considerable time and prevent users from editing e.g. home videos

Method used

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  • Editing of encoded A/V sequences
  • Editing of encoded A/V sequences
  • Editing of encoded A/V sequences

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] Figure 3A Represents a typical sequence of frames encoded according to MPEG-2. While the following description will focus on this encoding, those skilled in the art will appreciate that the present invention is applicable to other A / V encoding standards. Figure 3A Dependencies between frames are also shown. The transmission caused by the forward correlation of B frames as Figure 3A The frames in the sequence shown will have the effect that a received B-frame can only be decoded after a subsequent reference frame has been received (and decoded). To avoid having to "skip" the sequence during decoding, frames are usually not Figure 3A stored or transmitted as a sequence of displays, but in the Figure 3B stored or transmitted in the corresponding transmission sequence shown in . In this transmission sequence, reference frames are transmitted before the B frames that depend on them. This means that frames can be decoded in the order they were received. It should ...

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PUM

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Abstract

A data processing apparatus ( 800 ) has an input ( 810 ) for receiving a first and second sequence of frame-based A / V data. A processor ( 830 ) edits the two sequences forming a third combined sequence. So-called 'I-frames' are intra-coded, without reference to any other frame of the sequence. 'P-frames' are coded with reference to one prior reference frame, and 'B-frames' are coded with reference to one prior and one subsequent reference frame. The referential coding of a frame is based on motion vectors in the frame indicating similar macro blocks in the frame referred to. The processor identifies frames in the first sequence up to and including a first edit point and frames in the second sequence starting at a second edit point that have lost a reference frame. The processor ( 830 ) re-encodes each identified B-frames into a corresponding re-encoded frame by deriving motion vectors of the re-encoded frame solely from motion vectors of the original B-frame.

Description

technical field [0001] The present invention relates to a method and apparatus for editing frame-based encoded audio / video (A / V) data, in particular, but not limited to, editing audio / video data encoded according to the MPEG-2 standard Methods and apparatus for editing. combining at least two frame-based A / V data sequences to form a third combined sequence based on frames of a first sequence of frames up to and including said A first edit point in the first sequence, frames in the second sequence start at and include a second edit point in the second sequence. Each of said first and second sequences is encoded such that a number of frames (hereinafter "I-frames") are intra-coded independently of any other frames in the sequence, whereas a number of frames (hereinafter referred to as "P-frames") are coded separately with respect to a previous reference frame of the sequence, while the remaining frames (hereinafter referred to as "B-frames") are encoded with respect to a previ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/91G11B27/031H04N5/92
CPCG11B27/031
Inventor D·P·凯利J·P·范加斯塞
Owner KONINK PHILIPS ELECTRONICS NV