Error While Decoding Mb 40 9 Bytestream 9 Serial Data SDI

Error While Decoding Mb 40 9 Bytestream 9 Serial Data SDI

The SDI section 1 separates the source serial data SDI IN into a video signal VIDEO IN and an audio signal AUDIO IN 1, and supplies the video signal VIDEO IN to a SX encoder (SXENC) 2 and the audio signal AUDIO IN 1 to a delay section (DL) 3.

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In such apparatus and method, a plurality of coding parameters may be extracted from the source encoded stream, an error macroblock having a syntax error in the source encoded stream may be detected, the source encoded stream may be variable-length decoded so as to generate a variable-length-decoded stream, a predetermined macroblock having an acceptable syntax may be generated which conforms to a MPEG (motion picture image coding experts group) standard, and the error macroblock of the variable-length decoded stream may be replaced with the predetermined macroblock.

However, since a digital video signal may have a relatively large amount of data, the video signal may be compression encoded so as to enable data corresponding to a relatively long playback period to be recorded on a recording medium.

An example of a compression encoding method is a so-called MPEG (Moving Picture Image Coding Experts Group) method which is a hybrid method wherein motion-compensation predictive coding and discrete cosine transform (DCT) coding are combined.

In other words, redundancy in the time domain is reduced by taking a difference between frames of a video signal and redundancy in the spatial domain is reduced by the use of discrete cosine transform (DCT) to efficiently encode the video signal.

When such tape-shaped recording medium having helical tracks is reproduced at a speed higher than a normal tape running speed such as two times the normal speed (double speed) or three times the normal speed (triple speed) or such as that in a search function, since the trace angle of the rotating head on the tape becomes different from the angle of the recording tracks, all of the signals recorded in the helical tracks may not be reproduced.

In other words, during high speed reproduction, the video tape recorder may not reproduce all data elements recorded in the helical tracks, and instead may only reproduce some of such data elements.

In other words, if a MPEG stream recorded on a tape recording medium is reproduced at a high-speed, the reproduced video stream may not have all of the data elements and, as a result of such reproduction, it may be difficult to obtain a high-quality image with an effective use of the reproduced stream.

However, the SX stream and the MPEG stream differ in the arrangement of DCT coefficients in the encoded stream.

Specifically, with regard to the DCT coefficients, to create a high quality image during high-speed reproduction, the DC element and AC elements having lower spatial frequency may be considered more important than the AC elements having higher spatial frequency.

As a result, in the SX stream, AC elements of the DCT coefficients in the macroblock are rearranged in spatial frequency order from lower spatial frequency to higher spatial frequency.

On the other hand, when an encoded stream is to be recorded onto a tape medium, it may be preferred to use a SX stream as the recording stream.

In consideration thereof, a stream processing apparatus for processing a source encoded stream so as to convert a stream structure from that of a MPEG stream to that of a SX stream or from that of a SX stream to that of a MPEG stream has been proposed.

Such stream processing apparatus is described in U.S.

Ser. No. 09283,034 filed Apr.

When stream processing is performed on a source encoded stream by using such stream processing apparatus, it may be necessary to parse the syntax of the source encoded stream to extract the coding parameters.

Such syntax error may occur when prohibitive coding parameters, non-determined coding parameters, or contradiction coding parameters are included in the source encoded stream.

Also, when the source encoded stream includes data elements not corresponding to the variable encoding table, data elements which are interrupted, or data elements not having a predetermined data length, a syntax error may occur.

As a result of the failure of the parsing or the variable-length-decoding process due to a syntax error, the above stream processing apparatus may not operate properly.

Such video cassette recorder includes a recording section and a reproducing section.

The recording system of the video cassette recorder will be initially described below.