I have a Haugpauge HD PVR model 1212, it captures via usb into a .ts container using the h264 video codec and aac audio. I tried to apply a speed effect to the clips within kdenlive and the video playback is just grey. I realize h264 isn't the preferred format for linear video editing. What codec do I want to transcode the files into for working with them in kdenlive so I apply effects like speed and other effects? They are 1280x720p resolution so I don't want to transcode and lose any quality, I will be re-encoding them back into libx264 and aac audio for upload to youtube. What codec and container do you suggest I convert the .ts file into? Can I just use avidemux or handbrake? Any help is appreciated.