Separate video file for I-frame and non-I-frame data to improve disk performance in trick play

摘要

A device has an input circuit to receive a stream of video data, which includes intra-frames (I-frames) and inter-frames. A video frame parser separates the I-frames and inter-frames from the stream of video data. A memory device has a file system thereon, and a processor is configured to process the video data. The processor stores the I-frames in an I-frame file in a contiguous memory region of the memory device and stores the inter-frames in an inter-frame file of the memory device. The processor also stores an index file, which includes information to coordinate a pre-parsed position of each I-frame with at least one adjacent inter-frame.

主权项

1. A method to play a video data stream, comprising:
parsing the video data stream to extract constituent intra-frames (I-frames) and inter-frames; storing a sequence of I-frames in an I-frame file, each I-frame of the sequence including information to generate a corresponding presentable video frame; storing a set of inter-frames in an inter-frame file, each inter-frame of the set including a reference to at least one I-frame and information to generate a different presentable frame; storing a set of index values in an index file, the index values configured to identify relationships between I-frames of the I-frame file and inter-frames of the inter-frame file; receiving a user command to play a portion of the video data stream in reverse; retrieving I-frame index values from the index file; applying respective I-frame index values to retrieve corresponding I-frames from the I-frame file; retrieving inter-frame index values from the index file; using respective inter-frame index values to retrieve corresponding inter-frames from the inter-frame file; decoding the corresponding inter-frames; and forming a presentable video frame from each of the decoded corresponding inter-frames and at least one associated I-frame.