Azure Media Services Video Subclipper open-source release

已于 十二月 19, 2016 发布

Program Manager, Azure Media Services

We are excited to announce the open-source release of the Azure Media Services (AMS) Video Subclipper Plugin for Azure Media Player on GitHub.

The Azure Media Player (AMP) subclipper plugin provides a user interface to find subclip mark-in and mark-out points on a live or video-on-demand stream. The plugin outputs the mark-in and mark-out points in the stream that can then be consumed by a video content management system or the Azure Media Services subclipper API to produce dynamic manifest filters or new subclipped rendered video assets. This tool allows users to find mark-in and mark-out points with group-of-pictures (GOP) accuracy or frame accuracy.

Special thanks to Ian N. Bennett for his help and contributions to this project.

Public deployment

A public, hosted deployment of the subclipper is available at the Azure Media Subclipper Plugin webpage. This deployment supports subclipping from URL-sourced videos. A detailed usage guide is available in our repository documentation. Below is a preview of the subclipper interface.

Supported output modes

The subclipper supports three output modes: trim, virtual, and rendered.

Trim

Trim mode is segment boundary (GOP) accurate and creates a clip starting from the segment boundary closest to the mark-in point and ending at the end of the stream.

Virtual

Virtual mode is segment boundary accurate and creates a clip starting with the segment boundary that is closest to the mark-in point and ending with the segment boundary that is closest to the mark-out point.

Rendered

Rendered mode creates a new clip starting with the frame that is closest to the mark-in point and ending with the frame that is closest to the mark-out point. Frames are calculated based on the frame rate which can be set in the settings.

User Interface capabilities

Find mark-in & mark-out points

Once your stream has loaded, you can create the mark-in point by using the scrubber to scrub, playback to play to, or rewind/forward to the desired time, and then tapping/clicking on the set in button:

Set In

Once your stream has loaded, you can create the mark-in point by using the scrubber to scrub, playback to play to or rewind/forward to the desired time and then tapping/clicking on the set out button:

Set Out

Change mark points

Mark bar

The mark bar sits above the scrubber and shows both the mark-in and mark-out points as a handle on the bar. The mark bar’s scale is the same as the scrubber and its length represents the timeline of the stream. To change the mark-in and/or mark-out pint using the mark bar, simply tap/click on the handle and drag to the desired point and release:

Mark Bar

Mark arrows

On either side of the set in and set out buttons you’ll see arrows. Clicking on the left arrow moves the target mark point back one segment boundary for Trim and Virtual Modes or one frame for Rendered Mode. Clicking on the right arrow moves the target mark point forward one segment boundary for Trim and Virtual Modes or one frame for Rendered Mode:

Mark Arrows

Export a clip

With mark-in and mark-out points set (mark-out not required for Trim mode), the export button will be enabled and you can export your clip data. Clicking on export will open the submit dialog. When the submit dialog first opens, you’ll see a loading indicator, which will be present until the thumbnails are generated. After the thumbnails are generated, you can select a thumbnail, set a title, set a description, and also set other metadata depending on whether or not the provider has added custom form fields. With the thumbnail chosen and the metadata set, you can export the data by tapping/clicking on submit. After exporting the clip data, the provider’s application can process the data accordingly.

Export

Configure frame rate & number of thumbnails choices

There are two settings that you can modify to change the behavior of the subclipper, frame rate and number of thumbnail choices. Frame rate should be set to the frame rate of the source stream. The supported frame rates are 23.976 fps, 25 fps, 29.976, 30 fps, and 60 fps. The frame rate setting will be used to find the frames in the stream. The number of thumbnails setting determines how many thumbnail choices are generated in the submission dialog.

Settings