Video processing apparatus and method

1. A video processing method, comprising:

decoding a bitstream, wherein the bitstream comprises a plurality of groups of pictures and each group of pictures comprises a frame sequence;

determining whether a current frame of a current group of pictures to be displayed has macroblocks with forward reference to a previous frame of a previous group of pictures, wherein the current group of pictures is subsequent to the previous group of pictures; and

displaying the current frame of the current group of pictures when the current frame has no macroblock with forward reference to the previous frame of the previous group of pictures;

wherein the previous frame of the previous group of pictures is determined to be referenced by the current frame of the current group of pictures according to information specified from the encoding of the current frame, without the use of a flag.

2. The video processing method as claimed in claim 1 , further comprising:

skipping the display of the current frame of the current group of pictures to be displayed when the current frame has macroblocks with forward reference to the previous frame of the previous group of pictures and the previous frame is absent.

3. The video processing method as claimed in claim 2 , wherein the current frame of the current group of pictures to be displayed is a bi-directional predictive-coded frame following the intra coded frame of the current group of pictures and a flag in header of the current group of pictures is used to indicate that the current frame is encoded with forward reference to the previous frame.

4. The video processing method as claimed in claim 1 , wherein the bitstream is an MPEG-coded bitstream.

5. A video processing method, comprising:

decoding a bitstream, wherein the bitstream comprises a plurality of groups of pictures and each group of pictures comprises a frame sequence;

determining whether a current frame of a current group of pictures to be displayed has macroblocks with forward reference to a previous frame of the current group of pictures, wherein the current frame is subsequent to the previous frame; and

establishing a desired frame when the current frame has macroblocks with forward reference to the previous frame of the current group of pictures and the previous frame is absent,

wherein the desired frame is established by acquiring macroblock information of the desired frame according to remaining macroblocks of a plurality of frames of the current group of pictures including the current frame other than those with forward reference to the previous frame, and the frames of the current group of pictures other than the current frame follow the current frame;

wherein the establishing of the desired frame comprises:

determining intra-coded macroblocks and inter-coded macroblocks from one of the frames of the current group of pictures, wherein the intra-coded maroblocks have no reference frame and the inter-coded macroblocks have forward reference to a reference frame which is followed by the one of the frames of the current group of pictures; and

acquiring the macroblock information from the intra-coded macroblocks and the inter-coded macroblocks for establishing spatially corresponding macroblocks of the desired frame.

6. The video processing method as claimed in claim 5 , further comprising:

displaying the current frame of the current group of pictures to be displayed when the current frame has no macroblock with forward reference to the previous frame of the current group of pictures.

7. The video processing method as claimed in claim 5 , wherein the establishment of the desired frame comprises:

acquiring the macroblock information for all macroblocks of the desired frame according to remaining macroblocks of the frames of the current group of pictures including the current frame other than those with forward reference to the previous frame, wherein the frames of the current group of pictures other than the current frame follow the current frame.

8. The video processing method as claimed in claim 5 , further comprising:

displaying the desired frame.

9. The video processing method as claimed in claim 5 , wherein the current frame of the current group of pictures to be displayed is a predictive-coded frame.

10. A video processing apparatus, comprising:

a decoder for decoding a bitstream, wherein the bitstream comprises a plurality of groups of pictures and each group of pictures comprises a frame sequence;

a controller, coupled to the decoder, for determining whether a current frame of a current group of pictures to be displayed has macroblocks with forward reference to a previous frame of a previous group of pictures, wherein the current group of pictures is subsequent to the previous group of pictures; and

a display device, coupled to the controller, for displaying the current frame of the current group of pictures when the current frame has no macroblock with forward reference to the previous frame of the previous group of pictures;

wherein the previous frame of the previous croup of pictures is determined to be referenced by the current frame of the current group of pictures according to specified information from the encoding of the current frame, without the use of a flag.

11. The video processing apparatus as claimed in claim 10 , wherein the controller skips the display of the current frame of the current group of pictures to be displayed when the current frame has macroblocks with forward reference to the previous frame of the previous group of pictures and the previous frame is absent.

12. The video processing apparatus as claimed in claim 10 , wherein the current frame of the current group of pictures to be displayed is a bi-directional predictive-coded frame following the intra coded frame of the current group of pictures and a flag in the header of the current group of pictures is used to indicate that the current frame is encoded with forward reference to the previous frame of the previous group of pictures.

13. A video processing apparatus, comprising:

a decoder for decoding a bitstream, wherein the bitstream comprises a plurality of groups of pictures and each group of pictures comprises a frame sequence; and

a controller, coupled to the decoder, for determining whether a current frame of a current group of pictures to be displayed has macroblocks with forward reference to a previous frame of the current group of pictures which is followed by the current frame, and establishing a desired frame when the current frame has macroblocks with forward reference to the previous frame of the current group of pictures and the previous frame is absent,

wherein the desired frame is established by acquiring macroblock information of the desired frame according to remaining macroblocks of a plurality of frames of the current group of pictures including the current frame other than those with forward reference to the previous frame, and the frames of the plurality of frames of the current group of picture other than the current frame follow the current frame;

wherein the controller further determines intra-coded macroblocks and inter-coded macroblocks from one of the frames of the current group of pictures and acquires the macroblock information from the intra-coded macroblocks and the inter-coded macroblocks for establishing spatially corresponding macroblocks of the desired frame, and the intra-coded maroblocks have no reference frame and the inter-coded macroblocks have forward reference to a reference frame which is followed by the one of the frames of the current group of pictures.

14. The video processing apparatus as claimed in claim 13 , further comprising:

a display device, coupled to the controller, for displaying the desired frame.

15. The video processing apparatus as claimed in claim 14 , wherein the display device displays the current frame of the current group of pictures to be displayed when the current frame has no macroblock with forward reference to the previous frame.

16. The video processing apparatus as claimed in claim 13 , wherein the current frame of the current group of pictures to be displayed is a predictive-coded frame.