Syntax-aware manipulation of media files in a container format

Abstract

A container format processing tool performs syntax-aware manipulation of hierarchically organized syntax elements defined according to a container format in a media file. For example, a container format verifier checks conformance of a media file to a container format, which can help ensure interoperability between diverse sources of media content and playback equipment. Conformance verification can include verification of individual syntax elements, cross-verification, verification that any mandatory syntax elements are present and / or verification of synchronization. Or, a container format “fuzzer” simulates corruption of a media file, which can help test the resilience of playback equipment to errors in the media files. The container format fuzzer can simulate random bit flipping errors, an audio recording failure or incorrect termination of recording. Or, a container format editor can otherwise edit the media file in the container format.

Description

Background technique [0001] Engineers use compression (also known as source coding or encoding) to reduce the bit rate of digital media content. Compression reduces the cost of storing and transmitting media information by converting the information to a lower bit rate form. Decompression (also known as decoding) reconstructs the original version of the information from the compressed form. A "codec" is an encoder / decoder system. Over the past two decades, a variety of video codec standards and formats have been adopted, and a variety of audio codec standards and formats have been adopted. A codec standard or format typically defines options for the syntax of a coded media bitstream (sometimes called an elementary media bitstream), specifying the elements in the elementary media bitstream when specific features are used for encoding and decoding. parameter. In many cases, a codec standard or format also provides details about the decoding operations that a decoder should i...

AI Technical Summary

Problems solved by technology

In some cases, media files in container formats are corrupted due to random bit flips during streaming or conferencing

Alternatively, the media file may be corrupted due to storage failure, due to improper recording with the smartphone, or for another reason

However, for many recent container formats, existing tools neither provide sufficient means to verify a media file's compliance with the container format or at least identify broken file containers, nor do they provide sufficient means to alter elements of a media file , in order to test the resiliency of the playback device to errors in the media file

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