如何慢速播放视频以进行标记
我正在创建教练应用程序。我对视频上的标记感到震惊。所以我选择ffmpeg来将视频转换为图像帧。这使我的时间延迟以及记忆问题。我需要让用户逐帧缓慢播放视频。有没有其他方法可以在不进行图像转换的情况下实现这一点。 V1 Golf 非常快地完成了这个过程。请帮我。
I am Creating application for coaching. I struck with the marking on video. So I choose ffmpeg for converting video to image frame. That make me time delay as well as memory issues. I need to provide the user play the video slowly as frame by frame. Is there any other way to do that with out image conversion. V1 Golf did that process very quick manner. Please help me.
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我会尝试在单独的线程中转换视频帧，当用户进入“慢动作模式”时，我会提前提取几帧作为背景图像。
以下是一帧的示例，因此您应该快速处理其他帧： 视频帧捕获通过 NSOperation。
这应该可以减少延迟，并且可以在用户观看后续帧时转换帧。
I would try converting video frame in separate thread and I would extract a few frames ahead as images in the background when user gets into 'slow motion mode'.
Here is example for one frame, so you should be quick with others: Video frame capture by NSOperation.
This should reduce delays and frames could be converted while user is eye-consuming subsequent frames.