Constraints

Before using MPC, understand the following constraints.

**Table 1** Constraints
Item	Description
Media file storage	MPC does not store media files. You need to upload a video file to be transcoded to an OBS bucket before using MPC. The MPC service and the OBS bucket for storing media files must be in the same region, such as the CN North-Beijing4 region.
Video encoding format	Supported video codecs: H.264, H.265, MPEG-2, MPEG-4, MJPEG, VP6/7/8/9, WMV1/2/3, and ProRes 422. If the input file is not in one of the preceding formats, transcoding will fail.
Audio encoding format	The supported audio codecs: AAC, AC3, EAC3, HE-AAC, MP2, MP3, PCM (s161e, s16be, s241e, s24be, DVD), and WMA If the encoding format of the input file is not one of the preceding formats, transcoding will fail.
Video packaging format	Supported input formats: MP3, MP4, FLV, and TS Supported output formats: HLS and MP4
API request throttling	The caps on requests are as follows: Single tenants: 100 requests/minute Overall: 1000 requests/minute