ALEXA Mini MXF/ARRIRAW 工作流程
前言
這篇文檔將快速指引你如何在3.4.0b3及更高版本的ARC中觀看與處理新推出的ALEXA Mini錄製的MXF/ARRIRAW格式。
如何在ARC中加載MXF/ARRIRAW
> 打開ARC，在BROWSE標籤欄的File System窗口瀏覽到所需的MXF/ARRIRAW片段。
> 將這些片段拖拽到Project Files窗口。
在ARC中觀看MXF/ARRIRAW
> 進入VIEW標籤欄。
> 在Project Files窗口點擊任何一個.mxf文件即可在回放界面觀看。
> 在Clip Settings窗口可更改圖像處理參數，在Processing窗口可調整寬高比與解析度。
MXF/ARRIRAW格式
> SUP 4.0可錄製兩種不同成像尺寸的格式：
• 16:9 2.8K（2880×1620像素）
• 片門全開3.4K（3424×2202像素）
> 片門全開3.4K格式可在攝影機內設定不同的寬高比：
• 完整的片門全開（3424×2202像素）
• 片門全開4:3（2880×2160像素）
• 片門全開6:5（2560×2145像素）應該用於2K解析度下的變形寬銀幕2.0到2.39:1
• 片門全開8:9（1920×2160像素）應該用於HD解析度下的變形寬銀幕2.0到1.78:1
ARRI Look Files 2（ALF-2）格式色彩管理
> ARC 3.4.0.b3已支持新型的ALF-2畫面風格格式
> 在MXF/ARRIRAW片段內始終內嵌一個畫面風格。例如ARRI 709就是Rec709色彩空間的默認畫面風格
> 當某一片段被加載至回放界面後，Video Rec709與Look按鈕會變為藍色，說明這個片段目前正在以內嵌的ALF-2畫面風格呈現
> 要激活或停用ALF-2畫面風格，請點擊Look按鈕
> 畫面風格的目標色彩空間顯示在Video按鈕下方（Rec709、Rec2020、DCI P3；DCI D60與DCI D65）
> 要在Log C模式下觀看畫面，請點擊Log C Wide Gamut按鈕
快速渲染輸出QT文件
> 要將單個片段輸出為ProRes編碼的.mov文件，請點擊「快速渲染片段」按鈕：
> 快速渲染過程中，圖像處理方式是由Viewer Clip Settings決定的，畫面寬高比與解析度是由Viewer Processing參數決定的。色彩空間是由回放時的色彩設置決定的（參見「ARRI Look Files 2格式色彩管理」）。
為製作素材樣片與VFX輸出多個片段
> 要以ProRes、DPX或OpenEXR格式輸出多個片段，請進入Render標籤欄。
> 將選定的片段從Project Files窗口拖拽至Render Manager窗口。
> 在下方Target #1小窗口設置渲染處理的所有參數。
> 在Format & Color Space菜單選擇文件的壓縮格式（DPX、OpenEXR、ProRes）與色彩空間。
> Color Space下拉欄決定了渲染隊列內所有片段要使用的色彩空間。以下圖舉例，無論片段內嵌的ALF-2畫面風格已定義的目標色彩空間是什麼，這一次的ProRes素材樣片都會以Rec 709色彩空間渲染輸出。
> 當勾選「prefer Look Master Color Space」時，會優先採用ALF-2畫面風格定義的目標色彩空間。
如需更詳盡的ARRIRAW Converter使用教學，請訪問以下連結:
https://www.arri.com/camera/alexa/learn/arriraw_converter_tutorials/
MXF/ARRIRAW回放與渲染性能
> 性能測試硬體平臺
• Mac Pro OS X 10.10.5
• 8核心3 GHz Intel Xeon E5處理器
• 32 GB內存
• AMD FirePro D700 6144 MB圖形卡
• 源文件存儲與目標盤各採用8顆SSD固態硬碟組成Raid 0
> 全屏幕模式2下16:9 2.8K回放速率
• 原生解析度（2880×1620像素）50 fps
• 2K解析度（2048×1152像素）60 fps
> 全屏幕模式2下片門全開3.4K回放速率
• 原生解析度（3424×2202像素）30 fps
• 2K解析度（2048×1152像素）40 fps
> 16:9 2.8K素材渲染速率
• DPX原生解析度（2880×1620像素）18 fps
• DPX 2K解析度（2048×1152像素）24 fps
• ProRes 422原生解析度（2880×1620像素）14 fps
• ProRes 422 2K解析度（2048×1152像素）18 fps
• OpenEXR原生解析度（2880×1620像素）9 fps
• OpenEXR 2K解析度（2048×1152像素）19 fps
> 片門全開3.4K素材渲染速率
• DPX原生解析度（2880×1620像素）11 fps
• DPX 2K解析度（2048×1152像素）20 fps
• ProRes 422原生解析度（2880×1620像素）9 fps
• ProRes 422 2K解析度（2048×1152像素）16 fps
• OpenEXR原生解析度（2880×1620像素）5 fps
• OpenEXR 2K解析度（2048×1152像素）18 fps
如您對MXF/ARRIRAW有任何疑問，請隨時與我們聯繫：
電子郵件：service@arri.cn
聯繫電話：010-59009680 轉 技術部
MXF/ARRIRAW
Quick Guide for ARC 3.4.0.b4
WHITE PAPER
Introduction
The document should give you a quick overview how to view and process images of the new ALEXA Mini recoding format MXF/ARRIRAW in ARC 3.4.0b3 and higher.
How to load MXF/ARRIRAW in ARC
> Open ARC and browse to MXF/ARRIRAW clips in File System window.
> Drag and drop clips into the Project Files window
Viewing MXF/ARRIRAW in ARC
> Go to VIEW room
> To load clips into viewer and click on one of the .mxf files in the Project Files window
> To change the parameter for the image processing choose the Clip Settings and for aspect ratio and resolution use the parameter from the Processing window
> To load multiple clips into viewer create a New Sequence and drag and drop the wanted clips onto the Sequence icon.
MXF/ARRIRAW formats
> The SUP 4.0 enables two sensor photo size recording formats:
• 16by9 2.8K (2880x1620 pixel)
• Open Gate 3.4K (3424x2202 pixel)
- The Open Gate 3.4K format can be defined in camera for different aspect ratios:
• Full Open Gate (3424x2202 pixel)
• 4:3 from Open Gate (2880x2160 pixel)
• 6:5 from Open Gate (2560x2145 pixel) should be used for 2.0 anamorphic 2.39 in 2K resolution
• 8:9 from Open Gate (1920x2160 pixel) should be used for 2.0 anamorphic to 1.78 in HD resolution
Color Management with ARRI Look Files 2 format (ALF-2)
> ARC 3.4.0.b3 is extended to support the new Look format ALF-2.
> In the MXF/ARRIRAW clips is always a Look embedded. e.g. ARRI 709 is the default Look for Rec709.
> After loading a clip into the viewer the button Video Rec709 and Look is blue and the image is displayed in video with the embedded ALF-2 Look.
> To activate or deactivate an ALF-2 Look click on button Look.
> The target color space from the Look is displayed below the Video button. (Rec709, Rec2020, DCI P3; DCI D60 and DCI D65)
> To see the image in Log C click on button Log C Wide Gamut.
QT quick render export
> To export a single clip as ProRes .mov file click on Quick Render Clip button
> For the Quick Render the image processing is defined by the Viewer Clip Settings, the aspect ratio and resolution are defined by the Viewer Processing parameters. The color space is defined from the viewer color settings. (please see Color Management with ARRI Look Files 2)
Multiple clip export for dailies and VFX
> To export multiple clips as ProRes, DPX or OpenEXR files go to the Render room.
> Drag and drop the selected clips from the Project Files window into the Render Manager window.
> Go to Target #1 to define all parameter for the render process.
> For file format (DPX, OpenEXR, ProRes) the compression format and color space go to menu Format & Color Space.
> The Color Space box defined the color space for all clips in the render queue. For instance ProRes dailies should be rendered in Rec 709 no matter what is defined as target color space in the embedded ALF-2 Look.
> The target color space from the ALF-2 Look is not ignored when " prefer Look Master Color Space" is selected.
If you need a more detailed description about the ARRIRAW Converter functions please see the link below
https://www.arri.com/camera/alexa/learn/arriraw_converter_tutorials/
Playback and Render performance for MXF/ARRIRAW
> Used hardware for the performance test
• Mac Pro OS X 10.10.5
• Processor 3 GHz 8-Core Intel Xenon E5
• Memory 32 GB
• Graphics AMD FirePro D700 6144 MB
• Storage 2 x striped RAID set of 8 SSD drives for file source and destination
> Play back speed for 16by9 2.8K in full screen mode 2
• 50 fps in native resolution (2880x1620 pixel)
• 60 fps in 2K resolution (2048x1152 pixel)
> Play back speed for OG 3.4K in full screen mode 2
• 30 fps in native resolution (3424x2202 pixel)
• 40 fps in 2K resolution (2048x1152 pixel)
> Render speed for 16by9 2.8K footage
• 18 fps for DPX native resolution (2880x1620 pixel)
• 24 fps for DPX 2K resolution (2048x1152 pixel)
• 14 fps for ProRes 422 native resolution (2880x1620 pixel)
• 18 fps for ProRes 422 2K resolution (2048x1152 pixel)
• 9 fps for OpenEXR native resolution (2880x1620 pixel)
• 19 fps for OpenEXR 2K resolution (2048x1152 pixel)
> Render speed for Open Gate 3.4K footage
• 11 fps for DPX native resolution (2880x1620 pixel)
• 20 fps for DPX 2K resolution (2048x1152 pixel)
• 9 fps for ProRes 422 native resolution (2880x1620 pixel)
• 16 fps for ProRes 422 2K resolution (2048x1152 pixel)
• 5 fps for OpenEXR native resolution (2880x1620 pixel)
• 18 fps for OpenEXR 2K resolution (2048x1152 pixel)
Contact
If you have any questions regarding MXF/ARRIRAW, please feel free to contact us via email at service@arri.cn