Shulou(Shulou.com)06/03 Report--

Currently using version 3.4 of FFmpeg

Av_register_all

Avformat_open_input

Avformat_find_stream_info

Avcodec_find_decoder

Avcodec_open2

Av_read_frame

Avcodec_send_packet

Avcodec_receive_frame

Application process

1) call avformat_alloc_context to create an instance of AVFormatContext variable pAVFormatContext

AVFormatContext* pAVFormatContext = avformat_alloc_context ()

2) call avio_alloc_context to create an instance of AVIOContext variable pAVIOContext

AVIOContext* pAVIOContext = avio_alloc_context (mallocBuffer, mallocBufferSize, 0, this, ReadStreamData, NULL, NULL)

In this function, ReadStreamData is used to read the video or audio stream from the read network or file. MallocBuffer is used to save the read data for analysis. MallocBufferSize is the allocated cache length. Once the cache length requested by mallocBufferSize is less than the length of the data returned for reading, the data copied into the cache will be out of bounds and the program will crash.

3) if you already know that the format of the data is h364, call av_find_input_format to create an instance of AVInputFormat variable pAVInputFormat

AVInputFormat* pAVInputFormat = av_find_input_format ("h364")

PAVFormatContext- > iformat = pAVInputFormat

If (avformat_open_input (& pAVFormatContext, ", pAVInputFormat, NULL)

Iformat)

If (s-> iformat- > read_close)

S-> iformat- > read_close (s)

For playing rtsp://admin:admin888@192.168.28.130:554/h364/ch2/main/av_stream, it is mainly to send TearDown instructions to the camera.

Part II

Avio_close (pb)

Part III

Avformat_free_context (s)

The core of this function is to release the video and audio streams created by the application.

For (I = s-> nb_streams-1; I > = 0; iMury -)

Ff_free_stream (s, s-> streams [I])

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