FFmpeg Code NOTE 2: How to determine whether the stream inside the MP4 file is audio or video streaming

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Inside the MP4 structure, the HDLR field (specifically in ROOT->MOOV->TRAK->MDIA->HDLR) contains the stream is a video or audio or letter.

FFmpeg Code:

In the FFmpeg code, use the Codec->codec_type in the stream to determine what kind of flow the stream is.

The 12th part of the ISO_IEC_14496 International standard is marked as follows:

In the MP4 file, search 6C (hexadecimal number of HDLR), from which you can see that the video contains video streams and audio streams:

Video streaming:

Audio stream:

FFmpeg Code NOTE 2: How to determine whether the stream inside the MP4 file is audio or video streaming