Transport stream editing method and apparatus therefor
An editing of a video signal and an audio signal time-shared multiplex compressed by an MPEG-2 transport method designates a dividing position of the video signal at a boundary of video TS packets constituting a GOP, constructing a stream in front of said designated dividing position so as to include all audio TS packets corresponding to video TS packets present in the stream, overwriting a video TS packet, not having a corresponding audio TS packet in the stream, with a dummy TS packet, and overwriting, in a stream behind said designated dividing position, an audio TS packet with a dummy TS packet until an audio TS packet, coinciding with a reproducing timing of a video TS packet at said dividing position, appears. Thus a defective data reproduction resulting from a discontinuity in the data structure of audio frame before and after the dividing position can be avoided.
1. A method for editing a video signal and an audio signal, subjected to time-shared multiplex compression by an MPEG-2 transport method and recorded on a random accessible recording medium, the method comprising:
designating a dividing position of the video signal at a boundary of video TS packets constituting a GOP;
constructing a constructed stream from a first stream in front of said designated dividing position, a video TS packet present in a second stream behind said designated dividing position, and all audio TS packets present in the second stream corresponding to audio TS packets present in the first stream
first overwriting a video TS packet in the constructed stream, not having a corresponding audio TS packet in the first stream, with a dummy TS packet; and
second overwriting, in the behind stream, an audio TS packet with a dummy TS packet until an audio TS packet, coinciding with a reproducing timing of a video TS packet at said dividing position, appears.
2. A method according to claim 1 , wherein said dummy TS packet is null data.
3. An apparatus for editing a video signal and an audio signal, subjected to time-shared multiplex compression by an MPEG-2 transport method and recorded on a random accessible recording medium, the apparatus comprising:
means which designates a dividing position of the video signal at a boundary of video TS packets constituting a GOP; and
means for constructing a constructed stream from a first stream in front of said designated dividing position, a video TS packet present in a second stream behind said designated dividing position, and all audio TS packets present in the second stream corresponding to video TS packets present in the first stream, and performs:
a first overwriting a video TS packet in the constructed stream, not having a corresponding audio TS packet in the first stream, with a dummy TS packet, and
a second overwriting, in the behind stream, an audio TS packet with a dummy TS packet until an audio TS packet, coinciding with a reproducing timing of a video TS packet at said dividing position, appears.