Functions

MPC helps you transcode audio and video files stored in OBS buckets so that the output files can be played on a broad range of devices. It also supports snapshot capturing and watermarking.

Media Transcoding

Media transcoding is to convert an audio or video file into one or more output formats. This involves changing the parameters of the media file such as the format, codec, bitrate, and frame rate.

Parameter	Description
Input format	Input file formats: MP4, TS, MOV, FLV, MPG, MXF, WMV, ADTS, AVI, MKV, MPEG, GIF, and WAV Video codecs: H.264, H.265, MPEG-2, MPEG-4, MJPEG, VP6/7/8/9, WMV1/2/3, and ProRes 422 Audio codecs: AAC, AC3, EAC3, HE-AAC, MP2, MP3, PCM (s161e, s16be, s241e, s24be, DVD), and WMA Subtitle format: SRT file in UTF-8
Output format	Output file formats: DASH, HLS, MP4, MP3, and ADTS Video codecs: H.264 and H.265 Audio codecs: HE_AAC, AAC, and MP3 Image file format: GIF
Audio extraction	Extract audio from a video.
Mute video	Remove sound from a video.
Subtitling	Add subtitles to a video.
Watermarking	During transcoding, add static image/text watermarks to videos for copyright protection.

The transcoded audio and video specifications can be customized based on your needs. For details, see Table 1, Table 2, Table 3, and Table 4.

**Table 1** Video encoding parameters
Parameter	Description
Video Codec	The value can be H.264 or H.265. The default value is H.264.
Resolution (video width and video height)	H.264 Video width: [32, 4096] or 0. The unit is px. Video height: [32, 2880] or 0. The unit is px. H.265 Video width: [160, 4096] or 0. The unit is px. Video height: [96, 2880] or 0. The unit is px. If the video width and height are both set to 0, the transcoded video is produced based on the original resolution. If the video bandwidth or height is set to 0, the corresponding value is adjusted based on the original size.
Bitrate	Video bitrate. The value can be 0 or ranges from 40 to 30,000. The unit is kbit/s. If this parameter is set to 0, an output file is generated at the adaptive bitrate.
Maximum I-Frame Interval	Maximum interval between I frames in a key frame. The value ranges from 2 to 5.
Maximum Consecutive B-Frames	Maximum number of consecutive B-frames in a key frame. The value ranges from 0 to 7.
Profile	Encoding profile. If the video codec is H.264, BASE, MAIN, and HIGH are available. If the video codec is H.265, only MAIN is available.
FPS	Video frame rate. The value is 0 or ranges from 5 to 30. If this parameter is set to 0, an output file is generated at the original frame rate.
Maximum Reference Frames	Maximum number of reference frames. If the video codec is H.264, the value ranges from 1 to 8. If the video codec is H.265, the value is always 4.
Quality	Video encoding level. There are three levels. A larger value indicates higher encoding quality and longer transcoding time.
Black Bar Removal	Automatically detect and remove black bars from your video.

**Table 2** Video processing parameters
Parameter	Description
Video rotation angle	Rotate a video clockwise. Videos can be simply rotated by 90 degrees, 180 degrees, and 270 degrees.
Adaptive resolution	The following options are available: SHORT: Adaptive width LONG: Adaptive height None: Do not adapt.

**Table 3** Audio encoding parameters
Parameter	Description
Audio Codec	The available options are AAC, HE_AAC1, HE_AAC2, and MP3. The default value is AAC.
Sampling Rate	The value can be AUTO, 22050 Hz, 32000 Hz, 44100 Hz, 48000 Hz, or 96000 Hz. The default value is AUTO.
Bitrate	Audio bitrate. The value can be 0 or ranges from 8 to 1000. The unit is kbit/s.
Audio Channel	Number of audio channels. The value can be 1 or 2.

**Table 4** Video processing parameters
Parameter	Description
Volume control	Two methods are supported: auto: adjusts the volume automatically dynamic: adjusts the volume manually
Volume adjustment amplitude	The value range is [-15, 15], and the unit is dB.

Transcoding Templates

MPC provides plenty of built-in transcoding templates to meet your diverse requirements. You can also create a transcoding template to target your specific scenario.

Preset templates: You can directly use these templates without any other configuration. There are audio templates, audiovisual templates, and low bitrate HD templates, covering all output formats, encoding formats, and common resolutions and bitrates. Based on the number of output files, preset templates are classified into the following types:
- One-in one-out transcoding template: Only one file is output.
- One-in multiple-out transcoding template: A maximum of nine files can be output.
Custom templates: Set the video and audio parameters based on your needs. A custom template can be one-in one-out or one-in multiple-out. A maximum of six output specifications can be configured for a one-in multiple-out template.

Low Bitrate HD

MPC uses perceptual coding to analyze each scenario, action, content, and texture in a video, achieving lower bitrate and bandwidth usage at a given video quality.

Video Watermark

You can add both image and text watermarks to videos.
The input format can be PNG, JPG, or JPEG.
A maximum of two static images can be overlaid on an output video per frame.
A maximum of ten static images can be overlaid on each output video.
The resolution of a watermark is between 8 x 8 and 4096 x 4096. The size of the watermark cannot exceed 10 MB.

Snapshot Capturing

You can capture a snapshot from a video and save it as a JPG file during transcoding or at any other time. The following two capturing methods are supported:

By interval: Take snapshots at regular intervals. The default interval is 12s.
At fixed time: Take snapshots at specified time points.

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