JP5404038B2 - マルチメディア信号エンコーディングに使用される方法、装置およびシステム - Google Patents
マルチメディア信号エンコーディングに使用される方法、装置およびシステム Download PDFInfo
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Description
・ autc:アクセス・ユニット時間増分(逆フレームレート)、
・ bitrate:コーディングされたデータがHRDの入力に供給されるビットストリームレート指定
・ vbvsize:HRDバッファのサイズ、
・ iscbr:CBRストリームを示すフラグ、および/または
・ lowdelay:低遅延モードを示すフラグ。
・ tai:アクセス・ユニットからの最初のビットの到着時刻、
・ taf:アクセス・ユニットからの最後のビットの到着時刻、
・ trn:バッファからのアクセス・ユニットの取り出し時刻、
・ ton:アクセス・ユニットの表示時刻、
・ preBufferLevel:取り出しの前の取り出し時刻でのバッファ・レベル、
・ ausize:アクセス・ユニットのサイズ、
・ maxBufferLevel:この取り出し時刻で見られる最大バッファ・レベル、
・ minBufferLevel:この取り出す時刻で見られる最小バッファ・レベル、
・ unboundBufferLevel:バッファ・サイズに制限されないバッファ・レベル(無限バッファ・サイズを有するバッファ・レベル)、および/または
・ 他の関連情報。
・ isbperiod:これがバッファリング期間(GOVUスタート)であるかどうかを示すフラグ、
・ initial_cpb_removal_delay:特定の取り出し時刻のデコード前遅延、
・ initial_cpb_removal_delay_offset:特定の取り出し時刻のデコード前遅延オフセット、および/または
・ calc_initial_cpb_removal_delay:特定の取り出し時刻の理想的なデコード前遅延の計算された値。
・ isgovu:新しいGOPを示すフラグ、
・ vbv_delay:CBRの場合に各ピクチャのバッファ充満度を示す、および/または
・ calc_vbv_delay:各ピクチャのバッファ充満度の理想的な値。
・ isgovu:新しいエントリ・ポイントを示すフラグ、
・ hrd_full:各ピクチャのバッファ充満度を示す、および/または
・ calc_hdr_full:各ピクチャのバッファ充満度の理想的な値。
・ bit_rate_valueおよびbit_rate_extension:ビットレートの新しい値、
・ vbv_buffer_size_valueおよびvbv_buffer_size_extension:バッファ・サイズの新しい値、および/または
・ vbv_delay:各ピクチャのバッファ充満度の新しい値。
・ hrd_rate[n]:この特定のリーキー・バッファ・モデルのビットレートの新しい値、
・ hrd_buffer[n]:この特定のリーキー・バッファ・モデルのバッファ・サイズの新しい値、および/または
・ hrd_full[n]:この特定のリーキー・バッファ・・モデルの各ピクチャのバッファ充満度の新しい値。
・ bit_rate_value_minus1[n]:この特定のリーキー・バッファ・モデルのビットレートの新しい値、
・ cpb_size_value_minus1[n]:この特定のリーキー・バッファ・モデルのバッファ・サイズの新しい値、
・ cbr_flag[n]:この特定のリーキー・バッファ・モデルのCBR/VBRフラグの新しい値、
・ initial_cpb_removal_delay[n]:この特定のリーキー・バッファ・モデルのデコーディング遅延の新しい値、および/または
・ initial_cpb_removal_delay_offset[n]:この特定のリーキー・バッファ・モデルのデコーディング遅延オフセットの新しい値。
calc_initial_cpb_removal_delay=tg,90(n)=90000*(tr,n(n)−taf(n−1))
ここで、initial_cpb_removal_delay<=Ceil(Δtg,90(n))というVBRの制約に従い、かつ/またはFloor(Δtg,90(n))<=initial_cpb_removal_delay<=Ceil(Δtg,90(n))というCBRの制約に従う。
maxBitrate=R+DeltaLevelMin/segLen
・ mergeIndex:マージング・インデックス、
・ auBaseList:アクセス・ユニット情報のベース・リスト、
・ auBaseBuffer:バッファ・レベルのベース・リスト、
・ auSegList:アクセス・ユニット情報のセグメント・リスト、
・ auSegBuffer:バッファ・レベルのセグメント・リスト、
・ model:使用中のバッファ・モデル、
・ auOutList:アクセス・ユニット情報の出力リスト、および
・ auOutBuffer:バッファ・レベルの出力リスト。
Claims (10)
- コンテンツのエンコーディングに使用する方法であって、
ソース・コンテンツを受け取ること、
前記ソース・コンテンツをエンコードし、エンコードされたコンテンツを作ること、
前記エンコードされたコンテンツの第1のエンコードされたセグメントを、複数のバッファ・モデルと較べて評価すること、
前記評価することに基づいて、前記エンコードされたコンテンツの前記第1のエンコードされたセグメントが再エンコードされるべきかどうかを前記複数のバッファ・モデルのうちの1つまたは複数と較べて決定すること、および
前記第1のエンコードされたセグメントが再エンコードされるべきであると決定されると、前記第1のエンコードされたセグメントを再エンコードすることであって、前記第1のエンコードされたセグメントを再エンコードすることは、
前記第1のエンコードされたセグメントを再エンコードし、第1の再エンコードされたセグメントを作成すること、
前記第1のエンコードされたセグメントとは別に前記第1の再エンコードされたセグメントを格納すること、および
前記第1の再エンコードされたセグメントを前記エンコードされたコンテンツとマージし、前記第1の再エンコードされたセグメントのバッファ・レベルおよびアクセス・ユニット情報を用いて前記エンコードされたコンテンツのバッファ・レベルおよびアクセス・ユニット情報を調整することを含む、前記ソース・コンテンツのエンコーディングをファイナライズすること
を含む、再エンコードすること
を備えることを特徴とする方法。 - 前記エンコードされたコンテンツの前記第1のエンコードされたセグメントが再エンコードされるべきかどうかを決定することは、前記エンコードされたコンテンツが前記複数のバッファ・モデルのうちの第1のバッファ・モデルに失敗するかどうかを決定することを備え、
前記再エンコードすることは、前記エンコードされたコンテンツが第1のバッファ・モデルに失敗すると決定されると、前記第1のエンコードされたセグメントを再エンコードすることを備える
ことを特徴とする請求項1に記載の方法。 - 前記エンコードされたコンテンツが、前記複数のバッファ・モデルの第2のバッファ・モデルに失敗することを識別すること、および
前記第2のバッファ・モデルを、前記エンコードされたコンテンツに関連して無効化することをさらに備え、
前記無効化は、前記第2のバッファ・モデルを、前記エンコードされたコンテンツに関連して無効として指定し、かつ/またはそのストリームについて有効であることが分かっているバッファ・モデルによって置換することを含むことを特徴とする請求項2に記載の方法。 - 前記第2のバッファ・モデルを無効化することは、前記第2のバッファ・モデルのパラメータを、前記エンコードされたコンテンツに関して有効であることが分かっているバッファ・モデルである第4のバッファ・モデルからのパラメータで置換することを備えることを特徴とする請求項3に記載の方法。
- 前記エンコードされたコンテンツの第2のセグメントを識別すること、および
前記第2のセグメントを再エンコードし、ビットを解放すること
をさらに備え、前記第1のエンコードされたセグメントを再エンコードすることは、前記第1のエンコードされたセグメントを再エンコードして、前記解放されたビットを利用することを備える
ことを特徴とする請求項1に記載の方法。 - 第3のセグメントを識別すること、
チャプタ・ポイントが前記エンコードされたコンテンツに挿入されるべきであると、前記第3のセグメントに関連して識別すること、および
前記第3のセグメントを再エンコードし、チャプタ・ポイントを組み込むこと
をさらに備えることを特徴とする請求項1に記載の方法。 - 前記第1のエンコードされたセグメントを評価することは、複数の別個のバッファ・モデルに従って前記第1のエンコードされたセグメントの部分を同時にデコードすることを備えることを特徴とする請求項1に記載の方法。
- 前記コンテンツをエンコードすることは、
前記ソース・コンテンツの複数のセグメントを識別すること、
前記ソース・コンテンツの前記複数のセグメントを分離すること、
前記ソース・コンテンツの前記複数のセグメントを別々にエンコードし、エンコードされた分割されたセグメントを作ること、および
前記エンコードされた分割された複数のセグメントをスプライスし、エンコードされたコンテンツ・ストリームを作ること
を備えることを特徴とする請求項1に記載の方法。 - 前記ソース・コンテンツの複雑度を識別すること、および
前記ソース・コンテンツの前記複数のセグメントの前記識別された複雑度に従ってバッファ・レベルを調整すること
をさらに備えることを特徴とする請求項8に記載の方法。 - 前記ソース・コンテンツの時間相関を評価すること、および
前記ソース・コンテンツの前記複数のセグメントを識別することが、識別された境界に従って前記セグメントを定義することを備えるように、前記ソース・コンテンツ内の前記境界を識別すること
をさらに備えることを特徴とする請求項8に記載の方法。
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EP (1) | EP1908303A4 (ja) |
JP (1) | JP5404038B2 (ja) |
CN (1) | CN101253777A (ja) |
WO (1) | WO2007005750A2 (ja) |
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-
2006
- 2006-06-30 WO PCT/US2006/025844 patent/WO2007005750A2/en active Application Filing
- 2006-06-30 EP EP06786135A patent/EP1908303A4/en not_active Withdrawn
- 2006-06-30 JP JP2008520319A patent/JP5404038B2/ja active Active
- 2006-06-30 US US11/428,187 patent/US8175167B2/en active Active
- 2006-06-30 CN CNA2006800321631A patent/CN101253777A/zh active Pending
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2012
- 2012-04-16 US US13/447,485 patent/US8817889B2/en active Active
Also Published As
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CN101253777A (zh) | 2008-08-27 |
EP1908303A4 (en) | 2011-04-06 |
US20070002946A1 (en) | 2007-01-04 |
US20120275512A1 (en) | 2012-11-01 |
JP2009500951A (ja) | 2009-01-08 |
US8175167B2 (en) | 2012-05-08 |
WO2007005750A2 (en) | 2007-01-11 |
WO2007005750A3 (en) | 2007-08-30 |
EP1908303A2 (en) | 2008-04-09 |
US8817889B2 (en) | 2014-08-26 |
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