Video-reverse-playing

A pretty easy demo of using FFmpeg to play video in reverse

Environment

• Qt 5.14 MinGW 64-bit
• ffmpeg n4.4.2-20220415

How it works?

• I use the producer-consumer design pattern. The video decoder will decode video frames into a blocking queue. Once the queue is non-empty, the frame render will be notified and then retrieve frames from the buffer and render them on the screen.

Important classes:

• ReverseDisplay in /reverse_v3/reversedisplay.h, rendering thread.
• ReverseDecode in /reverse_v3/reversedecode.h, video-decoding thread.
• Controller in /reverse_v3/utils.h, a structure that contains a blocking queue to control the rendering and decoding thread.