Demand is implemented using ffmpeg format conversion, can play times speed control in the process of transformation, search on the net is usually implemented using libavfilter times speed playback, but here the interface such as av_buffersrc_add_frame, av_buffersink_get_frame etc are all need to get to AVFrame decoding, and format conversion is generally do not need to decode, it is ok to use the AVPacket, want to consult the ffmpeg do you have any other don't need to decoding to realize The Times speed playback method?