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ffmpeg 根据时间获取视频帧 | FLYING的博客 #18

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yang-f opened this issue Feb 28, 2020 · 0 comments
Open

ffmpeg 根据时间获取视频帧 | FLYING的博客 #18

yang-f opened this issue Feb 28, 2020 · 0 comments
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ffmpeg 根据时间获取视频帧 Gitalk

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yang-f commented Feb 28, 2020

https://yangf.vip/2017/07/08/ffmpeg-%E6%A0%B9%E6%8D%AE%E6%97%B6%E9%97%B4%E8%8E%B7%E5%8F%96%E8%A7%86%E9%A2%91%E5%B8%A7/

视频帧的排列顺序一般是I、B、B、P、B、B、P、B、B……I、B、B、P……如果时间戳对应的帧为P帧或者B帧是不能直接获取当前的视频帧的，所以我们的基本思路是：1，seek到前面最近的一个I帧；2，解码到离所给时间戳最近的视频帧，返回； 假设所给的时间戳单位为ms,我们需要将它转换为ffmpeg内部的时间戳：1int64_t fm_timestamp = input_timestamp/(av
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