AVCodecContext，編碼器上下文結構體，保存了視頻（音頻）編解碼相關信息 AVCodecContext 結構體定義在文件ffmpeg/libavcodec/avcodec.h中 /*** main external API structure.* New fields can be added to the end with minor version bumps.* Removal, reordering and changes to existing fields require a major* version bump.* You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user* applications.* The name string for AVOptions options matches the associated command line* parameter name and can be found in libavcodec/options_table.h* The AVOption/command line parameter names differ in some cases from the C* structure field names for historic reasons or brevity.* sizeof(AVCodecContext) must not be used outside libav*.*/ typedef struct AVCodecContext {/*** information on struct for av_log* - set by avcodec_alloc_context3*/const AVClass *av_class;int log_level_offset;//編解碼器的類型（

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