JP6942807B2 - ビデオコンテンツを符号化する反復技法 - Google Patents
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Description
図1は、本発明の1つ以上の態様を実施するように構成されたシステム100の概念図である。示されるように、システム100は、限定ではなく、任意の数の計算インスタンス110及びクラウド160を含む。一般にクラウド160は、カプセル化された共有リソース、ソフトウェア、データ等を含む。説明のために、同様の物体の複数のインスタンスは、その物体を識別する参照番号及び必要な場合にはインスタンスを識別する補足番号で示される。
上記問題に対処するために、システム100は、限定ではなく、ソースビデオシーケンス122に含まれる各ショットシーケンス132に向けて解像度及び符号化パラメータを最適化する反復符号化アプリケーション120を含む。ソースビデオシーケンス122は、限定ではなく、任意の数の連続及び非重複ショットシーケンス132を含む。各ショットシーケンス132は、通常、同様の空間時間属性を有し、中断されない時間期間にわたる1組のフレームを含む。反復符号化アプリケーション120は、メモリ116の1つに常駐し、プロセッサ112の1つで実行される。
図3は、本発明の様々な実施形態による図1の動的オプティマイザ150のより詳細な図である。示されるように、動的オプティマイザ150は、限定ではなく、ショット符号化セット310、凸包生成器340、凸包350、トレリス反復器360、シーケンストレリス370、任意の数のビデオ符号化点380、及びグローバル凸包390を含む。ショット符号化セット310の総数は、ショットシーケンス132の数に等しい。同様に、凸包340の総数はショットシーケンス132の数に等しい。一般に、ショットシーケンス132(x)にはショット符号化セット310(x)及び凸包340(x)の両方が関連付けられる。
図6は、本発明の様々な実施形態による、図5A〜図5Dに示される異なるビデオ符号化点380に基づいて図1の動的オプティマイザ150により生成されるグローバル凸包390を示す。示されるように、グラフ600はビットレート軸410及び歪み軸420を含む。
Claims (11)
- コンピュータ実施の方法において、
第1の組の符号化点及びメディアタイトルに関連付けられたソースビデオシーケンスに含まれる第1のショットシーケンスに基づいて第1の組のショット符号化点を生成するステップであって、各ショット符号化点には異なる符号化ショットシーケンスが関連付けられる、生成するステップと、
前記第1の組のショット符号化点にわたり1つ以上の凸包演算を実行するステップであって、それにより、前記第1のショットシーケンスに関連付けられた第1の凸包を生成する、実行するステップと、
前記第1の凸包及び前記ソースビデオシーケンスに含まれる第2のショットシーケンスに関連付けられた第2の凸包に基づいて複数の符号化ビデオシーケンスを生成するステップと、
前記複数の符号化ビデオシーケンス及び第1のビデオメトリックの標的値に基づいて、前記第1の組の符号化点に含まれない第1の符号化点を計算するステップと、
前記第1の符号化点に基づいて、最適化された符号化ビデオシーケンスを生成するステップであって、前記最適化された符号化ビデオシーケンスの少なくとも一部は続けて、前記メディアタイトルの再生中、エンドポイントデバイスにストリーミングされる、生成するステップと、
を含むことを特徴とする方法。 - 前記最適化された符号化ビデオシーケンスを生成するステップは、
前記第1のショットシーケンス及び前記第1の符号化点に基づいて第1の符号化ショットシーケンスを生成するステップと、
前記第2のショットシーケンス及び前記第1の符号化点に等しくない第2の符号化点に基づいて第2の符号化ショットシーケンスを生成するステップと、
前記第1の符号化ショットシーケンス及び前記第2の符号化ショットシーケンスを統合するステップと、
を含むことを特徴とする請求項1に記載の方法。 - 前記1つ以上の凸包演算を実行するステップは、
前記第1の組のショット符号化点を含む領域を特定するステップと、
前記領域の境界を識別するステップであって、前記第1の組のショット符号化点に含まれるショット符号化点は、前記境界の第1の側に存在しない、識別するステップと、
前記境界に沿って配置されない前記第1の組のショット符号化点に含まれる任意のショット符号化点を破棄するステップであって、それにより、前記第1の凸包を生成する、破棄するステップと、
を含むことを特徴とする請求項1に記載の方法。 - 前記複数の符号化ビデオシーケンスを生成するステップは、
第1のショット符号化点と第2のショット符号化点との間の第1の傾き値を計算するステップであって、前記第1のショット符号化点及び前記第2のショット符号化点の両方は、前記第1の凸包に含まれる、計算するステップと、
前記第1の傾き値に基づいて前記第2のショット符号化点に関連付けられた第1の符号化ショットシーケンスを選択するステップと、
前記第1の符号化ショットシーケンスを第2の符号化ショットシーケンスと統合するステップであって、それにより、第1の符号化ビデオシーケンスを生成し、前記第2の符号化ショットシーケンスには、前記第2の凸包に含まれる第3のショット符号化点が関連付けられる、統合するステップと、
を含むことを特徴とする請求項1に記載の方法。 - 前記第1の符号化点を計算するステップは、
前記複数の符号化ビデオシーケンスに基づいてグローバル凸包を生成するステップであって、前記グローバル凸包は第1の組のビデオ符号化点を含む、生成するステップと、
前記標的値に基づいて前記第1の組のビデオ符号化点に含まれる第1のビデオ符号化点を選択するステップと、
前記第1のビデオ符号化点及び前記第1の凸包に基づいて前記第1の符号化点を特定するステップと、
を含むことを特徴とする請求項1に記載の方法。 - 前記第1の符号化点を計算するステップは、
前記標的値に基づいて前記複数の符号化ビデオシーケンスに含まれる第1の符号化ビデオシーケンスを識別するステップと、
前記第1の符号化ビデオシーケンスに関連付けられ、前記第1の凸包に含まれる第1のショット符号化点を識別するステップと、
前記第1のショット符号化点と第2のショット符号化点との間の距離に基づいて、前記第1の凸包に含まれる前記第2のショット符号化点を識別するステップと、
前記第1のショット符号化点及び前記第2のショット符号化点に基づいて少なくとも1つの算術演算を実行するステップと、
を含むことを特徴とする請求項1に記載の方法。 - 前記少なくとも1つの算術演算を実行するステップは、符号化パラメータの第1の値及び前記符号化パラメータの第2の値の平均を計算するステップを含み、前記符号化パラメータの前記第1の値には、前記第1のショット符号化点が関連付けられ、前記符号化パラメータの前記第2の値には前記第2のショット符号化点が関連付けられることを特徴とする請求項6に記載の方法。
- 前記第1の符号化点を計算するステップは、
前記標的値に基づいて前記複数の符号化ビデオシーケンスに含まれる第1の符号化ビデオシーケンスを識別するステップと、
前記第1の符号化ビデオシーケンスが関連付けられ、前記第1の凸包に含まれる第1のショット符号化点を識別するステップと、
前記第1のショット符号化点と第2のショット符号化点との間の距離に基づいて、前記第1の凸包に含まれる前記第2のショット符号化点を識別するステップと、
前記第1のショット符号化点に関連付けられた第1の解像度が、前記第2のショット符号化点に関連付けられた第2の解像度に等しくないと判断するステップと、
前記第1の解像度及び前記第2の解像度に基づいて、符号化パラメータの最大値又は前記符号化パラメータの最小値のいずれかに前記符号化パラメータの終点値を設定するステップと、
前記第1のショット符号化点に関連付けられた前記符号化パラメータの第1の値と前記符号化パラメータの前記終点値との間で少なくとも1つの算術演算を実行するステップと、
を含むことを特徴とする請求項1に記載の方法。 - 前記第1のビデオメトリックは、ビットレート、ピーク信号対雑音比(PSNR)、線形ビデオ多方法評価融合(VMAF)メトリック、調和VMAF(VMAFh)メトリック、又は歪みメトリックを含むことを特徴とする請求項1に記載の方法。
- 命令を含むコンピュータ可読記憶媒体において、前記命令は、プロセッサにより実行されると、前記プロセッサに、
第1の組の符号化点及びメディアタイトルに関連付けられたソースビデオシーケンスに含まれる第1のショットシーケンスに基づいて第1の組のショット符号化点を生成するステップであって、各ショット符号化点には異なる符号化ショットシーケンスが関連付けられる、生成するステップと、
前記第1の組のショット符号化点にわたり1つ以上の凸包演算を実行するステップであって、それにより、前記第1のショットシーケンスに関連付けられた第1の凸包を生成する、実行するステップと、
前記第1の凸包及び前記ソースビデオシーケンスに含まれる第2のショットシーケンスに関連付けられた第2の凸包に基づいてグローバル凸包を生成するステップと、
第1のビデオメトリックの標的値、前記グローバル凸包、及び前記第1の凸包に基づいて、前記第1の組の符号化点に含まれない第1の符号化点を計算するステップと、
前記第1の符号化点に基づいて、最適化された符号化ビデオシーケンスを生成するステップであって、前記最適化された符号化ビデオシーケンスの少なくとも一部は続けて、前記メディアタイトルの再生中、エンドポイントデバイスにストリーミングされる、生成するステップと、
を実行させることを特徴とするコンピュータ可読記憶媒体。 - システムにおいて、
命令を記憶するメモリと、
前記メモリに結合されるプロセッサであって、前記命令を実行すると、
メディアタイトルに関連付けられたビデオシーケンスを分割して、複数のフレームセットにするステップと、
第1の組の符号化点及び前記複数のフレームセットに含まれる第1のフレームセットに基づいて、第1の組のショット符号化点を生成するステップであって、各符号化点には異なる符号化フレームセットが関連付けられる、生成するステップと、
前記第1の組のショット符号化点にわたり1つ以上の凸包演算を実行するステップであって、それにより、前記第1のフレームセットに関連付けられた第1の凸包を生成する、実行するステップと、
前記第1の凸包及び前記複数のフレームセットに含まれる第2のフレームセットに関連付けられた第2の凸包に基づいて複数の符号化ビデオシーケンスを生成するステップと、
前記複数の符号化ビデオシーケンス及び第1のビデオメトリックの標的値に基づいて、前記第1の組の符号化点に含まれない第1の符号化点を計算するステップと、
前記第1の符号化点に基づいて、最適化された符号化ビデオシーケンスを生成するステップであって、前記最適化された符号化ビデオシーケンスの少なくとも一部は続けて、前記メディアタイトルの再生中、エンドポイントデバイスにストリーミングされる、生成するステップと、
を行うように構成されるプロセッサと、
を含むことを特徴とするシステム。
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