JP2014527783A - マルチメディアコンテンツのシームレスな解像度切替のための解像度の選択 - Google Patents
マルチメディアコンテンツのシームレスな解像度切替のための解像度の選択 Download PDFInfo
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Abstract
Description
本発明は、マルチメディアコンテンツの配信に関し、より具体的には、種々のスケーリングされたディスプレイ解像度に最適化された複数の解像度でエンコードされたビデオコンテンツのストリーミングに関する。
メディアのストリーミングという用語は、再生デバイス上のメディアの再生を説明するものであり、メディアは、サーバ上に記憶され、再生の間、ネットワークを経由して、再生デバイスに継続的に送信される。典型的には、メディアの次の部分の受信の前に、再生デバイスが全てのバッファされたメディアの再生を完了することによる再生の中断を防止するために、再生デバイスは、再生の間、任意の所与の時間において、十分な量のメディアをバッファ内に記憶する。適応ビットレートストリーミングまたは適応ストリーミングは、現在のストリーミング状態(例えば、ユーザのネットワーク帯域幅およびCPU容量)をリアルタイムで検出し、適宜、ストリーミングされるメディアの質を調節することを伴う。
解像度=1536×864;サンプルアスペクト比=1:1
解像度=1152×648;サンプルアスペクト比=1:1
解像度=960×544;サンプルアスペクト比=1:1
解像度=768×432;サンプルアスペクト比=1:1
でエンコードされる。
解像度=1536×832;サンプルアスペクト比=1:1
解像度=1152×624;サンプルアスペクト比=1:1
解像度=960×520;サンプルアスペクト比=1:1
解像度=768×416;サンプルアスペクト比=1:1
でエンコードされる。
解像度=1536×656;サンプルアスペクト比=1:1
解像度=1152×488;サンプルアスペクト比=1:1
解像度=960×408;サンプルアスペクト比=1:1
解像度=768×328;サンプルアスペクト比=1:1
でエンコードされる。
解像度=1536×640;サンプルアスペクト比=1:1
解像度=1152×480;サンプルアスペクト比=1:1
解像度=960×400;サンプルアスペクト比=1:1
解像度=768×320;サンプルアスペクト比=1:1
でエンコードされる。
本発明のある実施形態による適応ビットレートストリーミングシステムが、図1に図示される。適応ビットレートストリーミングシステム100は、ソースエンコーダ106を含み、ソースエンコーダ106は、それぞれが同一のアスペクト比を有するいくつかの代替ストリームとして、ソースメディアをエンコードするように構成される。図示される実施形態では、ソースエンコーダは、サーバである。他の実施形態では、ソースエンコーダは、プロセッサと、ソースメディア(ビデオ、オーディオ、および/または字幕を含むが、それらに限定されない)のトランスコーディングを行なうための十分なリソースとを含む任意の処理デバイスであることができる。ソースエンコーディングサーバ106は、典型的には、ストリームを含む複数のコンテナファイルに対するトップレベルインデックスを生成し、少なくとも、そのうちの複数のものが、代替ストリームである。代替ストリームは、同一のメディアコンテンツを異なる方法でエンコードするストリームである。多くの事例では、代替ストリームは、メディアコンテンツ(限定されないが、ビデオ等)を異なる最大ビットレートでエンコードする。いくつかの実施形態では、代替ストリームは、異なる解像度および/または異なるフレームレートでエンコードされる。しかしながら、代替ビデオストリームは、ソースビデオのアスペクト比に対応する同一のアスペクト比でエンコードされる。トップレベルインデックスファイルおよびコンテナファイルは、HTTPサーバ104にアップロードされる。ソースエンコーディングサーバ106が、トップレベルインデックスファイルを生成するように前述されるが、多くの実施形態では、トップレベルインデックスファイルは、再生デバイスによる特定のコンテンツに対する要求に応答して、動的に生成される。
前述のように、適応ビットレートストリーミングシステムは、ストリーミング状態に応じて、異なるビットレートでエンコードされた異なるビデオストリーム間の切替を伴う。異なる解像度でエンコードされた代替ビデオストリームを利用する適応ストリーミングシステムでは、各ストリームの解像度は、所与のビットレートでエンコードされたビデオの再生品質に基づいて、選択されることができる。本発明の実施形態による、ビデオストリームのための解像度を選択するための一般化された工程が、図2に図示される。工程200は、所与のアスペクト比に基づいて、主要解像度を選択する(210)ことによって開始する。例えば、16:9のアスペクト比に対して、本発明の多くの実施形態では、主要解像度は、1920×1080画素である。全ての高さおよび幅の組み合わせを幅によって決定する212ために、主要解像度の幅が1度に1列ずつ、減少され、対応する高さが、アスペクト比を新しい幅に適用することによって計算され得る。いくつかの実施形態では、画像の幅は、8画素の倍数でなければならない。いくつかの実施形態では、計算された高さは、直近の整数値に丸められてもよい。多くの実施形態では、高さおよび幅の組み合わせの決定(212)は、幅が、の所定の最小幅(例えば、320画素)に到達するまで繰り返される。主要解像度の幅および高さの組み合わせを決定する(214)ために、同じ工程が、高さに関して前述のように利用され得る。前述のように、いくつかの実施形態では、高さは、8画素の高さの倍数である。但し、他の実施形態では、最終画像幅および高さは、ある数の画素の任意の倍数(例えば、2または4画素の倍数)として定義され得る。
マルチメディアコンテンツ内に含まれるビデオデータは、多くの場合、特定の解像度およびアスペクト比で作成される。しかしながら、マルチメディアコンテンツを種々のディスプレイデバイス上で表示することが望ましいが、これらのディスプレイデバイスは、ビデオデータと同一の解像度でもアスペクト比でもない場合がある。適応ストリーミングシステムでは、ビデオデータは、ソースマルチメディアコンテンツの表示において、一貫性レベルを維持するために、異なるアスペクト比を有する種々の主要解像度でエンコードされ得る。本発明の実施形態による、複数のアスペクト比を有するビデオストリームのための解像度を選択するための一般化された工程が、図3に図示される。工程300は、種々のアスペクト比に対する主要解像度の組を決定する(310)ことによって開始する。例えば、多くの実施形態では、主要解像度(付随のアスペクト比を有する)は、1920×1080(16:9)、1920×1040(1.85:1)、1920×816(2.35:1)、および1920×800(2.4:1)であり得る。各主要解像度に対して、解像度が、計算され(312)、主要解像度に対する計算された解像度の比が、決定される(314)。本発明の多くの実施形態では、前述の工程は、各主要解像度に対して計算された解像度および比を決定するために利用されてもよい。いくつかの実施形態では、比の決定(314)は、主要解像度と比較して、計算された解像度が含む割合面積を表す割合に、比を変換することを伴い、割合面積は、所定の数の有効桁(例えば、1有効桁)に丸められる。主要解像度の計算された解像度間の共通の比が、次いで、選択される(316)。多くの実施形態では、選択された共通の比(316)は、全主要解像度に共通である。いくつかの実施形態では、選択された共通の比(316)は、4つの主要解像度中3つ、5つの主要解像度中3つ、または3つの主要解像度中2つ等、主要解像度の大部分に共通である。共通の比が選択されると、対応する幅が、決定される(318)。一致する比を有していない主要解像度に対しては、直近の幅が、選択され得る。いくつかの実施形態では、直近の幅は、4の倍数であるはずである。多くの実施形態では、直近の幅は、8の倍数であるはずである。幅に基づいて、対応する高さが、アスペクト比を利用して決定される(320)。
Claims (28)
- プロセッサを備えるソースエンコーダであって、
前記プロセッサは、ソースエンコーダアプリケーションによって、
マルチメディアコンテンツを受信することであって、前記マルチメディアコンテンツは、主要解像度および主要サンプルアスペクト比を有するビデオデータを備える、ことと、
前記ビデオデータを代替ストリームの組としてエンコードすることと
を行うように構成され、
前記代替ストリームの組内の複数のストリームは、異なる最大ビットレートおよび解像度を有し、
前記複数のストリームのそれぞれの解像度は、幅および高さを備え、前記幅および高さは両方とも、整数の画素であり、
前記複数のストリームのそれぞれの前記幅および高さは両方とも、対応する前記主要解像度の幅および高さの常分数である、
ソースエンコーダ。 - 前記代替ストリームの組内の複数のストリームは、同一のアスペクト比と、異なる最大ビットレートおよび解像度とを有する、請求項1に記載のソースエンコーダ。
- 前記代替ストリームの組内の複数のストリームは、同一のアスペクト比と、異なる最大ビットレート、サンプルアスペクト比、および解像度とを有する、請求項1に記載のソースエンコーダ。
- 前記主要解像度は、1920×1080であり、前記主要アスペクト比は、16:9であり、前記代替ストリームの組内の複数のストリームは、以下の解像度およびサンプルアスペクト比:
解像度=1536×864;サンプルアスペクト比=1:1
解像度=1152×648;サンプルアスペクト比=1:1
解像度=960×544;サンプルアスペクト比=1:1
解像度=768×432;サンプルアスペクト比=1:1
でエンコードされる、請求項3に記載のソースエンコーダ。 - 前記主要解像度は、1920×1040であり、前記主要アスペクト比は、1.85:1であり、前記代替ストリームの組内の複数のストリームは、以下の解像度およびサンプルアスペクト比:
解像度=1536×832;サンプルアスペクト比=1:1
解像度=1152×624;サンプルアスペクト比=1:1
解像度=960×520;サンプルアスペクト比=1:1
解像度=768×416;サンプルアスペクト比=1:1
でエンコードされる、請求項3に記載のソースエンコーダ。 - 前記主要解像度は、1920×816であり、前記主要アスペクト比は、2.35:1であり、前記代替ストリームの組内の複数のストリームは、以下の解像度およびサンプルアスペクト比:
解像度=1536×656;サンプルアスペクト比=1:1
解像度=1152×488;サンプルアスペクト比=1:1
解像度=960×408;サンプルアスペクト比=1:1
解像度=768×328;サンプルアスペクト比=1:1
でエンコードされる、請求項3に記載のソースエンコーダ。 - 前記主要解像度は、1920×800であり、前記主要アスペクト比は、2.40:1であり、前記代替ストリームの組内の複数のストリームは、以下の解像度およびサンプルアスペクト比:
解像度=1536×640;サンプルアスペクト比=1:1
解像度=1152×480;サンプルアスペクト比=1:1
解像度=960×400;サンプルアスペクト比=1:1
解像度=768×320;サンプルアスペクト比=1:1
でエンコードされる、請求項3に記載のソースエンコーダ。 - 主要解像度および主要サンプルアスペクト比を有するビデオデータを備えるマルチメディアコンテンツを、複数の代替ストリームとしてエンコードする方法であって、前記方法は、
ソースエンコーダを使用して、主要解像度および主要サンプルアスペクト比を有するビデオデータを備えるマルチメディアコンテンツを受信することと、
ソースエンコーダを使用して、前記ビデオデータを代替ストリームの組としてエンコードすることであって、前記代替ストリームの組内の複数のストリームは、異なる最大ビットレートおよび解像度を有する、ことと
を含み、
前記複数のストリームのそれぞれの解像度は、幅および高さを備え、前記幅および高さは両方とも、整数の画素であり、前記複数のストリームのそれぞれの前記幅および高さは両方とも、対応する前記主要解像度の幅および高さの常分数である、方法。 - 前記分数の分子および分母はそれぞれ、100未満である、請求項8に記載の方法。
- メモリと通信するように構成されたプロセッサを備える再生デバイスであって、
前記メモリは、クライアントアプリケーションを含み、
前記クライアントアプリケーションは、
インデックスファイルを取得することであって、前記インデックスファイルは、同一のアスペクト比と、異なるビットレート、解像度とを有する複数の代替ビデオストリームを記述し、前記複数の代替ビデオストリームのうちの少なくとも2つは、異なるサンプルアスペクト比を有する、ことと、
前記複数の代替ビデオストリームのうちの第1のストリームの解像度およびサンプルアスペクト比を有するビデオをデコードするように、ビデオデコーダを構成することであって、前記ビデオをデコードすることは、前記デコードされたビデオをディスプレイデバイスの解像度にスケーリングすることを含む、ことと、
前記第1のストリームの一部を要求することと
を行うように前記プロセッサを構成する、再生デバイス。 - コンテンツを再生する方法であって、前記方法は、
再生デバイスを使用して、インデックスファイルを取得することであって、前記インデックスファイルは、同一のアスペクト比と、異なるビットレート、解像度とを有する複数の代替ビデオストリームを記述し、前記複数の代替ビデオストリームのうちの少なくとも2つは、異なるサンプルアスペクト比を有する、ことと、
前記複数の代替ビデオストリームのうちの第1のストリームの解像度およびサンプルアスペクト比を有するビデオをデコードするように、前記再生デバイス上のビデオデコーダを構成することであって、前記ビデオをデコードすることは、前記デコードされたビデオをディスプレイデバイスの解像度にスケーリングすることを含む、ことと、
前記再生デバイスを使用して、前記第1のストリームの一部を要求することと
を含む、方法。 - 主要解像度および主要アスペクト比を有する主要ビデオストリームをより低い解像度のストリームの組としてエンコードするために、副解像度の組を決定する方法であって、前記方法は、
副解像度の組を選択することであって、前記副解像度の組内の各副解像度の高さおよび幅は、整数の画素であり、前記主要解像度の対応する幅および高さ未満である、ことと、
前記副解像度の組から副解像度を選択することであって、前記選択された副解像度の幅および高さは、前記主要アスペクト比と同一のアスペクト比を有する、ことと
を含む、方法。 - 前記副解像度の組内の各副解像度に対する幅および高さは、8の倍数である、請求項12に記載の方法。
- 前記副解像度の組は、正方形のサンプルアスペクト比を有する副解像度を備える、請求項12に記載の方法。
- 前記副解像度の組は、
前記主要解像度の幅から列幅を反復的に減算し、結果として生じる幅に前記主要アスペクト比を乗算することにより、対応する高さを決定することと、
前記幅および対応する高さが整数の画素である副解像度を選択することと
によって選択される、請求項12に記載の方法。 - 前記副解像度の組を選択することは、
前記主要解像度の高さから行高さを反復的に減算し、結果として生じる高さに前記主要アスペクト比を乗算することにより、対応する幅を決定することと、
前記高さおよび対応する幅が整数の画素である副解像度を選択することと
をさらに含む、請求項15に記載の方法。 - 前記副解像度の組内の各副解像度に対する幅および高さは、8の倍数である、請求項16に記載の方法。
- 前記副解像度の組は、正方形のサンプルアスペクト比を有する副解像度を備える、請求項16に記載の方法。
- 前記副解像度の組は、正方形のサンプルアスペクト比を有する副解像度を備え、各副解像度に対する幅および高さは、8の倍数である、請求項16に記載の方法。
- 1920×1080、1920×1040、1920×816、および1920×800の前記主要解像度に対する副解像度が、計算される、請求項16に記載の方法。
- 前記副解像度の組は、前記主要解像度の大部分に対して繰り返される共通幅を有する副解像度を備え、副解像度は、前記共通幅値を共有しない任意の主要解像度に対して選択される、請求項20に記載の方法。
- 前記共通幅値を有していない前記主要解像度に対して選択される副解像度は、前記幅値を使用して、前記主要解像度のアスペクト比と同じアスペクト比を有する高さ値を選択することによって生成される、請求項21に記載の方法。
- 前記選択された高さ値は、直近の8画素の倍数に丸められる、請求項22に記載の方法。
- 前記選択された高さ値は、直近の8の倍数に切り下げられる、請求項22に記載の方法。
- 前記副解像度の組は、
前記主要解像度の高さから行高さを反復的に減算し、結果として生じる高さに前記主要アスペクト比を乗算することにより、対応する幅を決定することと、
前記高さおよび対応する幅が整数の画素である副解像度を選択することと
によって選択される、請求項12に記載の方法。 - プロセッサ命令を含む機械読み取り可能なメディアであって、
プロセッサによる前記命令の実行は、前記プロセッサに、
主要解像度および主要サンプルアスペクト比を有するビデオデータを備えるマルチメディアコンテンツを受信することと、
前記ビデオデータを代替ストリームの組としてエンコードすることであって、前記代替ストリームの組内の複数のストリームは、異なる最大ビットレートおよび解像度を有する、ことと
を含む工程を行なわせ、前記複数のストリームのそれぞれの解像度は、幅および高さを備え、前記幅および高さは両方とも、整数の画素であり、前記複数のストリームのそれぞれの前記幅および高さは両方とも、対応する前記主要解像度の幅および高さの常分数である、プロセッサ命令を含む機械読み取り可能なメディア。 - 前記分数の分子および分母はそれぞれ、100未満である、請求項26に記載のプロセッサ命令を含む機械読み取り可能なメディア。
- プロセッサ命令を含む機械読み取り可能なメディアであって、
プロセッサによる前記命令の実行は、前記プロセッサに、
インデックスファイルを取得することであって、前記インデックスファイルは、同一のアスペクト比と、異なるビットレート、解像度とを有する複数の代替ビデオストリームを記述し、前記複数の代替ビデオストリームのうちの少なくとも2つは、異なるサンプルアスペクト比を有する、ことと、
前記複数の代替ビデオストリームのうちの第1のストリームの解像度およびサンプルアスペクト比を有するビデオをデコードするように、ビデオデコーダを構成することであって、前記ビデオをデコードすることは、前記デコードされたビデオをディスプレイデバイスの解像度にスケーリングすることを含む、ことと、
前記第1のストリームの一部を要求することと
を含む工程を行なわせる、プロセッサ命令を含む機械読み取り可能なメディア。
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