# US 7,412,154 B2 · Digital motion picture decoding apparatus and digital motion picture decoding method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,412,154 B2 - Document ID: US7412154B2 - Status: Granted - Kind: B2 - Application number: 10/805,275 - Filed: 2004-03-22 - Published: 2004-09-09 - Granted: 2008-08-12 - Earliest claimed: 1996-10-31 - Assignees: Matsushita Electric Industrial Co., Ltd. - Inventors: Nobuo Setoguchi; Akihiro Watabe - Web page: https://patentgrep.com/patent/US7412154B2 ## CPC - H04N 21/426: Internal components of the client {; Characteristics thereof} (H04N5/44 takes precedence) - H04N 21/4383: {Accessing a communication channel} - H04N 21/44004: {involving video buffer management, e.g. video decoder buffer or video display buffer} - H04N 21/44016: {involving splicing one content stream with another content stream, e.g. for substituting a video clip} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A digital motion picture decoding apparatus comprising an input buffer memory for storing coded data to be decoded, a reproduced picture memory for storing the decoded picture data to be displayed, and a display picture deciding means for deciding a reproduced picture to be output from the picture data stored in the reproduced picture memory, further comprises: a program changing means for changing the type of the coded data to be decoded; a program change detecting means for detecting from the output of the program changing means that the type of the coded data to be decoded is changed; and a display state maintaining means for controlling the picture data output from the reproduced picture memory so as to maintain the display state of the reproduced picture which is currently displayed according to the decision of the display picture deciding means, when it is detected from the output of the program change detecting means that the change of the type of the coded data to be decoded makes the coded data not continuous in time sequence. ## Claims ### Claim 1 A digital motion picture decoding method comprising the steps of: decoding a coded data as a reproduction picture; outputting the reproduction picture; receiving a manually inputted signal which causes only one discontinuity in time sequence of the coded data to be decoded and which causes decoding of coded data read after the discontinuity lapses as a new reproduction picture; outputting a reproduction picture repeatedly until the new reproduction picture is ready to be output, after receiving the manually inputted signal; and nullifying decoded data, including decoded data which has not been outputted, corresponding to coded data read prior to the occurrence of the discontinuity, after receiving the manually inputted signal. ### Claim 2 (depends on 1) The digital motion picture decoding method of claim 1, wherein the coded data includes predictive coded data. ### Claim 3 (depends on 2) The digital motion picture decoding method of claim 2, wherein the nullifying step further nullifies decoded data other than decoded data corresponding to the reproduction picture. ### Claim 4 (depends on 3) The digital motion picture decoding method of claim 3, further comprising the steps of: decoding coded data read after the discontinuity lapses as the new reproduction picture; and outputting the new reproduction picture. ### Claim 5 (depends on 4) The digital motion picture decoding method of claim 4, further comprising the steps of: stopping the decoding of coded data read prior to the occurrence of the discontinuity; and nullifying coded data read prior to the occurrence of the discontinuity. ### Claim 6 (depends on 5) The digital motion picture decoding method of claim 5, wherein the coded data includes bidirectional predictive coded data. ### Claim 7 (depends on 6) The digital motion picture decoding method of claim 6, wherein the coded data is coded by an MPEG coding method. ### Claim 8 (depends on 7) The digital motion picture decoding method of claim 7, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 9 (depends on 8) The digital motion picture decoding method of claim 8, wherein the manually inputted signal is received from a remote control. ### Claim 10 (depends on 5) The digital motion picture decoding method of claim 5, wherein the nullified decoded data is not reproduced thereafter. ### Claim 11 A digital motion picture outputting method comprising the steps of: outputting a reproduction picture; receiving a manually inputted signal which causes only one discontinuity in time sequence of coded data to be decoded and which causes decoding coded data read after the discontinuity lapses as a new reproduction picture; outputting a reproduction picture repeatedly until the new reproduction picture is ready for output, after receiving the manually inputted signal; and nullifying decoded data, including decoded data which has not been outputted, corresponding to coded data read prior to the occurrence of the discontinuity, after receiving the manually inputted signal. ### Claim 12 (depends on 11) The digital motion picture outputting method of claim 11, wherein the coded data includes predictive coded data. ### Claim 13 (depends on 12) The digital motion picture outputting method of claim 12, wherein the nullifying step further nullifies decoded data other than decoded data corresponding to the reproduction picture before outputting the new reproduction picture. ### Claim 14 (depends on 13) The digital motion picture outputting method of claim 13, further comprising the step of outputting the new reproduction picture. ### Claim 15 (depends on 14) The digital motion picture outputting method of claim 14, further comprising the steps of: stopping the decoding of coded data read prior to the occurrence of the discontinuity; and nullifying coded data read prior to the occurrence of time discontinuity. ### Claim 16 (depends on 15) The digital motion picture outputting method of claim 15, wherein the coded data includes bidirectional predictive coded data. ### Claim 17 (depends on 16) The digital motion picture outputting method of claim 16, wherein the coded data is coded by an MPEG coding method. ### Claim 18 (depends on 17) The digital motion picture outputting method of claim 17, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 19 (depends on 18) The digital motion picture outputting method of claim 18, wherein the manually inputted signal is received from a remote control. ### Claim 20 (depends on 15) The digital motion picture outputting method of claim 15, wherein the nullifying decoded data is not reproduced thereafter. ### Claim 21 A digital motion picture decoding apparatus, comprising: a decoder configured to decode coded data as a reproduction picture; an outputting unit configured to output the reproduction picture; and a controller configured to receive a manually inputted signal which causes only one discontinuity in time sequence of a coded data to be decoded and which causes decoding of coded data read after the discontinuity lapses as a new reproduction picture, wherein the controller is configured to nullify decoded data, including decoded data which has not been outputted, corresponding to coded data read prior to the occurrence of the discontinuity and is configured to output a reproduction picture repeatedly until the new reproduction picture is ready to be output, after receiving the manually inputted signal. ### Claim 22 (depends on 21) The digital motion picture decoding apparatus of claim 21, wherein the coded data includes predictive coded data. ### Claim 23 (depends on 22) The digital motion picture decoding apparatus of claim 22, wherein the controller is further configured to nullify decoded data corresponding to the reproduction picture. ### Claim 24 (depends on 23) The digital motion picture decoding apparatus of claim 23, wherein the outputting unit outputs the new reproduction picture. ### Claim 25 (depends on 24) The digital motion picture decoding apparatus of claim 24, wherein the controller is configured to: stop the decoding coded data read prior to the occurrence of the discontinuity; and nullify coded data read prior to the occurrence of time discontinuity. ### Claim 26 (depends on 25) The digital motion picture decoding apparatus of claim 25, wherein the coded data includes bidirectional predictive coded data. ### Claim 27 (depends on 26) The digital motion picture decoding apparatus of claim 26, wherein the coded data is coded by an MPEG coding method. ### Claim 28 (depends on 27) The digital motion picture decoding apparatus of claim 27, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 29 (depends on 28) The digital motion picture decoding apparatus of claim 28, wherein the manually inputted signal is received from a remote control. ### Claim 30 (depends on 25) The digital motion picture decoding apparatus of claim 25, wherein the nullifying decoded data is not reproduced thereafter. ### Claim 31 A digital motion picture outputting apparatus, comprising: an outputting unit configured to output the reproduction picture; and a controller configured to receive a manually inputted signal which causes only one discontinuity in time sequence of coded data to be decoded and which causes decoding of coded data read after the discontinuity lapses as a new reproduction picture, wherein the controller is configured to nullify decoded data, including decoded data which has not been outputted, corresponding to coded data read prior to the occurrence of the discontinuity and is configured to output a reproduction picture repeatedly until the new reproduction picture is ready to be displayed, after receiving the manually inputted signal. ### Claim 32 (depends on 31) The digital motion picture outputting apparatus of claim 31, wherein the coded data includes predictive coded data. ### Claim 33 (depends on 32) The digital motion picture outputting apparatus of claim 32, wherein the controller is further configured to nullify decoded data corresponding to the reproduction picture. ### Claim 34 (depends on 33) The digital motion picture outputting apparatus of claim 33, wherein the outputting unit outputs the new reproduction picture. ### Claim 35 (depends on 34) The digital motion picture outputting apparatus of claim 34, wherein the controller is configured to: stop the decoding coded data read prior to the occurrence of the discontinuity; and nullify coded data read prior to the occurrence of time discontinuity. ### Claim 36 (depends on 35) The digital motion picture outputting apparatus of claim 35, wherein the coded data includes bidirectional predictive coded data. ### Claim 37 (depends on 36) The digital motion picture outputting apparatus of claim 36, wherein the coded data is coded by an MPEG coding method. ### Claim 38 (depends on 37) The digital motion picture outputting apparatus of claim 37, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 39 (depends on 38) The digital motion picture outputting apparatus of claim 38, wherein the manually inputted signal is received from a remote control. ### Claim 40 (depends on 35) The digital motion picture outputting apparatus of claim 35, wherein the nullified decoded data is not reproduced thereafter. ### Claim 41 A digital motion picture decoding method comprising the steps of: decoding coded data as a reproduction picture; outputting the reproduction picture; receiving a manually inputted signal; nullifying decoded data which has not been outputted, corresponding to coded data which has been read, in response to the manually inputted signal; and outputting a reproduction picture repeatedly until the new reproduction picture from coded data read after receiving the manually inputted signal is ready to be displayed. ### Claim 42 (depends on 41) The digital motion picture decoding method of claim 41, wherein the coded data includes predictive coded data. ### Claim 43 (depends on 42) The digital motion picture decoding method of claim 42, wherein the nullifying step further nullifies decoded data other than decoded data corresponding to the reproduction picture before outputting the new reproduction picture. ### Claim 44 (depends on 43) The digital motion picture decoding method of claim 43, further comprising the step of: decoding coded data read after receiving the manually inputted signal as the new reproduction picture; and outputting the new reproduction picture. ### Claim 45 (depends on 44) The digital motion picture decoding method of claim 44, further comprising the steps of: stopping decoding coded data which has been read; and nullifying coded data which has been read. ### Claim 46 (depends on 45) The digital motion picture decoding method of claim 45, wherein the coded data includes bidirectional predictive coded data. ### Claim 47 (depends on 46) The digital motion picture decoding method of claim 46, wherein the coded data is coded by an MPEG coding method. ### Claim 48 (depends on 47) The digital motion picture decoding method of claim 47, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 49 (depends on 48) The digital motion picture decoding method of claim 48, wherein the manually inputted signal is received from a remote control. ### Claim 50 (depends on 45) The digital motion picture decoding method of claim 45, wherein the nullifying decoded data is not reproduced thereafter. ### Claim 51 A digital motion picture outputting method comprising the steps of: outputting a reproduction picture; receiving a manually inputted signal; nullifying decoded data which has not been outputted, corresponding to coded data which has been read, in response to the manually inputted signal; and outputting a reproduction picture repeatedly until the new reproduction picture from coded data read after receiving the manually inputted signal is ready to be displayed. ### Claim 52 (depends on 51) The digital motion picture outputting method of claim 51, wherein the coded data includes predictive coded data. ### Claim 53 (depends on 52) The digital motion picture outputting method of claim 52, wherein the nullifying step further nullifies decoded data other than decoded data corresponding to the reproduction picture before outputting the new reproduction picture. ### Claim 54 (depends on 53) The digital motion picture outputting method of claim 53, further comprising the step of outputting the new reproduction picture. ### Claim 55 (depends on 54) The digital motion picture outputting method of claim 54, further comprising the steps of: stopping the decoding of coded data which has been read; and nullifying the coded data which has been read. ### Claim 56 (depends on 55) The digital motion picture outputting method of claim 55, wherein the coded data includes bidirectional predictive coded data. ### Claim 57 (depends on 56) The digital motion picture outputting method of claim 56, wherein the coded data are coded by an MPEG coding method. ### Claim 58 (depends on 57) The digital motion picture outputting method of claim 57, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 59 (depends on 58) The digital motion picture outputting method of claim 58, wherein the manually inputted signal is received from a remote control. ### Claim 60 (depends on 55) The digital motion picture outputting method of claim 55, wherein the nullifying decoded data is/are not reproduced thereafter. ### Claim 61 A digital motion picture decoding apparatus, comprising: a decoder configured to decode coded data as a reproduction picture; an outputting unit configured to output the reproduction picture; and a controller configured to receive a manually inputted signal, wherein the controller is configured to: nullify decoded data which has not been outputted, corresponding to coded data which has been read, in response to the manually inputted signal, and output a reproduction picture repeatedly until the new reproduction picture from coded data read after receiving the manually inputted signal is ready for display. ### Claim 62 (depends on 61) The digital motion picture decoding apparatus of claim 61, wherein the coded data includes predictive coded data. ### Claim 63 (depends on 62) The digital motion picture decoding apparatus of claim 62, wherein the controller is further configured to nullify decoded data other than decoded data corresponding to the reproduction picture before outputting the new reproduction picture. ### Claim 64 (depends on 63) The digital motion picture decoding apparatus of claim 63, wherein, the decoder decodes coded data read after receiving the manually inputted signal as the new reproduction picture; and the outputting unit outputs the new reproduction picture. ### Claim 65 (depends on 64) The digital motion picture decoding apparatus of claim 64, wherein the controller is configured to: stop decoding the coded data; and nullify coded data which has been read. ### Claim 66 (depends on 65) The digital motion picture decoding apparatus of claim 65, wherein the coded data includes bidirectional predictive coded data. ### Claim 67 (depends on 66) The digital motion picture decoding apparatus of claim 66, wherein the coded data is coded by an MPEG coding method. ### Claim 68 (depends on 67) The digital motion picture decoding apparatus of claim 67, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 69 (depends on 68) The digital motion picture decoding apparatus of claim 68, wherein the manually inputted signal is received from a remote control. ### Claim 70 (depends on 65) The digital motion picture decoding apparatus of claim 65, wherein the nullifying decoded data is/are not reproduced thereafter. ### Claim 71 A digital motion picture outputting apparatus, comprising: an outputting unit configured to output die reproduction picture; and a controller configured to receive a manually inputted signal, wherein the controller is configured to: nullify decoded data which has not been outputted, corresponding to coded data which has been read, in response to the manually inputted signal; and output a reproduction picture repeatedly until the new reproduction picture from coded data read after receiving the manually inputted signal is ready to be output. ### Claim 72 (depends on 71) The digital motion picture outputting apparatus of claim 71, wherein the coded data includes predictive coded data. ### Claim 73 (depends on 72) The digital motion picture outputting apparatus of claim 72, wherein the controller is further configured to nullify decoded data other than decoded data corresponding to the reproduction picture before outputting the new reproduction picture. ### Claim 74 (depends on 73) The digital motion picture outputting apparatus of claim 73, wherein the outputting unit outputs the new reproduction picture. ### Claim 75 (depends on 74) The digital motion picture outputting apparatus of claim 74, wherein the controller is configured to: stop the decoding the coded data; and nullify coded data read prior to receiving the manually inputted signal. ### Claim 76 (depends on 75) The digital motion picture outputting apparatus of claim 75, wherein the coded data includes bidirectional predictive coded data. ### Claim 77 (depends on 76) The digital motion picture outputting apparatus of claim 76, wherein the coded data is coded by an MPEG coding method. ### Claim 78 (depends on 77) The digital motion picture outputting apparatus of claim 77, wherein said MPEG coding method is MPEG 2 coding method. ### Claim 79 (depends on 78) The digital motion picture outputting apparatus of claim 78, wherein the manually inputted signal is received from a remote control. ### Claim 80 (depends on 75) The digital motion picture outputting apparatus of claim 75, wherein the nullifying decoded data is/are not reproduced thereafter. ### Claim 81 A digital motion picture decoding method comprising the steps of: (a) decoding a coded data stream as a reproduction picture; (b) receiving a manually inputted signal which causes only one discontinuity in time sequence of a coded data stream to be decoded; (c) maintaining a displayed frame until a frame from coded data read after the discontinuity lapses is decoded and ready to be displayed; and (d) nullifying decoded data, including decoded data which has not been displayed and has been decoded before decoding of a frame that has been outputted to be displayed, corresponding to coded data read prior to the occurrence of the discontinuity. ### Claim 82 (depends on 81) The digital motion picture decoding method according to claim 81, wherein the frame that has been outputted to be displayed corresponds to a displayed frame. ### Claim 83 (depends on 81) The digital motion picture decoding method according to claim 81, wherein the frame that has been outputted to be displayed corresponds to a frame designated to display next to a displayed frame. ### Claim 84 (depends on 81) The method for decoding the motion picture according to claim 81, wherein the coded data stream comprises a plurality of contiguous coded frames. ### Claim 85 (depends on 81) The method for decoding the digital motion picture according to claim 81, further comprising the steps of: (i) identifying from the coded data stream a frame of a first type; (ii) outputting the frame of the first type first from the coded data stream; (iii) identifying from the coded data stream a frame of a second type that is before a last frame in the coded data stream; and (iv) outputting the frame of the second type last from the coded data stream. ### Claim 86 (depends on 85) The method for decoding the digital motion picture according to claim 85, wherein the frame of the first type corresponds to an intra-frame coded picture. ### Claim 87 (depends on 85) The method for decoding the digital motion picture according to claim 85, wherein the frame of the second type corresponds to a forward predictive coded picture. ### Claim 88 (depends on 85) The method for decoding the digital motion picture according to claim 85, further comprising the steps of: (v) identifying from the coded data stream a frame of a third type after the frame of the second type; and (vi) outputting the frame of the third type after the frame of the first type and before the frame of the second type. ### Claim 89 (depends on 88) The method for decoding the digital motion picture according to claim 88, wherein the frame of the third type corresponds to a bidirectional predictive coded picture. ### Claim 90 (depends on 81) The method for decoding the digital motion picture according to claim 81, further comprising the steps of: (i) storing a plurality of frames decoded from the coded data stream; and (ii) selecting a stored frame to be output. ### Claim 91 (depends on 90) The method for decoding the digital motion picture according to claim 90, wherein step (c) further comprises the step of reselecting the stored frame to be outputted until the frame from coded data read after the discontinuity lapses is decoded and ready to be displayed. ### Claim 92 (depends on 91) The method for decoding the digital motion picture according to claim 91, wherein the frame to be reselected corresponds to the frame outputted upon receiving the interrupt signal. ### Claim 93 (depends on 81) The method for decoding the digital motion picture according to claim 81, wherein the coded data coded by an MPEG coding scheme. ### Claim 94 (depends on 93) The method for decoding the digital motion picture according to claim 93, wherein said MPEG coding scheme is MPEG 2 coding scheme. ### Claim 95 (depends on 94) The method for decoding the digital motion picture according to claim 94, wherein the manually inputted signal is received from an external device. ### Claim 96 A method of reproducing a digital motion picture comprising a first series of coded frames arranged in a first order and a second series of coded frames, comprising the steps of: (a) decoding the first series of coded frames in the first order; (b) outputting frames decoded in step (a) in a second order different from the first order; (c) receiving an interrupt signal when at least one frame has been outputted in step (b); (d) decoding the second series of coded frames further to the interrupt signal; (e) nullifying at least one frame that has been decoded in step (a) but has not been outputted according to the second order; and (f) maintaining a frame that has been outputted according to the second order at least until a frame of the second series has been decoded and is ready to be outputted. ### Claim 97 (depends on 96) The method for decoding the motion picture according to claim 96, wherein the first series and the second series each comprise a plurality of contiguous frames. ### Claim 98 (depends on 96) The method for decoding the motion picture according to claim 96, wherein in step (b) the frames are outputted to be displayed. ### Claim 99 (depends on 96) The method for decoding the digital motion picture according to claim 96, wherein execution of steps (a) and (b) at least partially overlap. ### Claim 100 (depends on 96) The method for decoding the digital motion picture according to claim 96, wherein step (f) further comprises the step of repeatedly outputting the frame that has been outputted according to the second order at least until the frame of the second series has been decoded and is ready to be outputted. ### Claim 101 (depends on 96) The method for decoding the digital motion picture according to claim 96, further comprising the steps of: (i)identifying from the first series a frame of a first type; (ii)outputting the frame of the first type first from the series; (iii) identifying from the first series a frame of a second type tat is before a last frame in the first series; and (iv) outputting the frame of the second type last from the first series. ### Claim 102 (depends on 101) The method for decoding the digital motion picture according to claim 101, wherein the frame of the first type corresponds to an intra-frame coded picture. ### Claim 103 (depends on 101) The method for decoding the digital motion picture according to claim 101, wherein the frame of the second type corresponds to a forward predictive coded picture. ### Claim 104 (depends on 101) The method for decoding the digital motion picture according to claim 101, further comprising the steps of: (v) identifying from the first series a frame of a third type after the frame of the second type; and (vi) outputting the frame of the third type after the frame of the first type and before the frame of the second type. ### Claim 105 (depends on 104) The method for decoding the digital motion picture according to claim 104, wherein the frame of the third type corresponds to a bidirectional predictive coded picture. ### Claim 106 (depends on 96) The method for decoding the digital motion picture according to claim 96, further comprising the steps of: (v) storing the frames decoded in step (a); and (vi) selecting a stored frame to be output according to the second order. ### Claim 107 (depends on 106) The method for decoding the digital motion picture according to claim 106, wherein step (f) further comprises the step of reselecting a frame to be outputted until the frame of the second series has been decoded and is ready to be outputted. ### Claim 108 (depends on 107) The method for decoding the digital motion picture according to claim 107, wherein the frame to be reselected corresponds to the frame outputted upon receiving the interrupt signal. ### Claim 109 (depends on 96) The method for decoding the digital motion picture according to claim 96, further comprising the steps of: (i) decoding the second series frames in a third order; and (ii) outputting the second series of frames in a fourth order different from the third order. ### Claim 110 (depends on 96) The method for decoding the digital motion picture according to claim 96, wherein the series of coded frames includes predictive coded data. ### Claim 111 (depends on 96) The method for decoding the digital motion picture according to claim 96, further comprising the steps of determining timing of a frame to be outputted based on time information and output order for a frame previously outputted and output order for the frame to be outputted. ### Claim 112 (depends on 111) The method for decoding the digital motion picture according to claim 111, wherein the output order for the frame previously outputted and output order for the frame to be outputted each correspond a display order for the respective frame. ### Claim 113 (depends on 96) The method for decoding the digital motion picture according to claim 96, further comprising the steps of: (i) extracting output order and time information; and (ii) outputting the frames according to the extracted output order and time information. ### Claim 114 (depends on 113) The method for decoding the digital motion picture according to claim 113, further comprising the steps of: (iii) obtaining reference picture data; and (iv) decoding the frames using the reference picture data. ### Claim 115 (depends on 106) The method for decoding the digital motion picture according to claim 106, further comprising the steps of: (iii) outputting the decoded frames; and (iv) storing the decoded in predetermined locations of a memory according to an address signal. ### Claim 116 (depends on 96) The method for decoding the digital motion picture according to claim 96, wherein the series is coded by an MPEG coding scheme. ### Claim 117 (depends on 116) The method for decoding the digital motion picture according to claim 116, wherein said MPEG coding scheme is MPEG 2 coding scheme. ### Claim 118 (depends on 117) The method for decoding the digital motion picture according to claim 117, wherein the signal interrupting step (c) corresponds to a manually inputted signal received from an external device. ### Claim 119 A digital motion picture decoding method comprising the steps of: decoding a coded data stream as a reproduction picture; receiving a manually inputted signal which causes only one discontinuity in time sequence of a coded data stream to be decoded; rendering decoded data, including decoded data which has not been displayed, corresponding to coded data read prior to the occurrence of the discontinuity as null data; and continuing to display a frame data read prior to the occurrence of the discontinuity until a frame from coded data read after the discontinuity lapses is decoded and ready to be displayed. ### Claim 120 A digital motion picture decoding method comprising the steps of: decoding a coded data stream as a reproduction picture; receiving a manually inputted signal which causes only one discontinuity in time sequence of a coded data stream to be decoded; rendering decoded data, including decoded data which has not been displayed, corresponding to coded data read prior to the occurrence of the discontinuity as null data; and continuing to display a frame displayed upon receipt of the manually inputted signal until a frame from coded data read after the discontinuity lapses is decoded and ready to be displayed. ### Claim 121 (depends on 119) A digital motion picture decoding method as defined in claim 119, wherein said step of rendering decoded data as null data is for making coded data obtained after the occurrence of the discontinuity be able to be decoded. ### Claim 122 (depends on 120) A digital motion picture decoding method as defined in claim 120, wherein said step of rendering decoded data as null data is for making coded data obtained after the occurrence of the discontinuity be able to be decoded.