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tbn tbn: the time base in AVStream that has come from the container 视频流时长的精确度time_base,即1s = 90000个刻度 视频总时长T = AVStream.duration * AVStream.time_base 阅读全文
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官方源码 /** * Initialize the AVCodecContext to use the given AVCodec. Prior to using this * function the context has to be allocated with avcodec_alloc_c 阅读全文
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官方源码 /** * Stream structure. * New fields can be added to the end with minor version bumps. * Removal, reordering and changes to existing fields requi 阅读全文
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结构体AVClass /** * Describe the class of an AVClass context structure. That is an * arbitrary struct of which the first field is a pointer to an * AVCla 阅读全文
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结构体AVCodecContext 点击这里查看AVCodecContext 结构体AVCodec 点击这里查看AVCodec 函数声明avcodec_alloc_context3 /** * Allocate an AVCodecContext and set its fields to defa 阅读全文
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AVCodec typedef struct AVCodec { /** * Name of the codec implementation. * The name is globally unique among encoders and among decoders (but an * enc 阅读全文
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结构体AVCodecContext typedef struct AVCodecContext { /** * information on struct for av_log * - set by avcodec_alloc_context3 */ const AVClass *av_class; 阅读全文