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FFmpegPreRecordH264Provider is dependent on FFmpegH264Provider. It is designed for pre-recording. It supports setting the cache duration in milliseconds.

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Set encoding parameters, and prepare FFmpegH264Provider.

/**
 * Set encoding parameters and initialize all required resources.
 *
 * @param param set parameters of the encoder.
 *
 */
int prepare(VideoStreamParam_t param);

destroy

Destroy FFmpegH264Provider.

/**
 * Empty the cached data and release all resources.
 */
void destroy();

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This is a sample of how to pre-record MP4 dependent on FFmpegPreRecordH264Provider, FFmpegH264Provider, and FFmpegAVMuxer.

the flow of pre-record MP4:

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