AVCHD

Abstract: Although recording and streaming lecture videos is becoming popular, large-scale lecture recording is still a difficult task for many universities. Auto lecture recording systems with robotic tripod or smart sensors are too expensive to be standard equipment in many classrooms. A simple solution of human-operated recording is also resource intensive from the perspective of hiring, training, and managing operators. A possible solution for the problem is the combination of recording with a stationary high-definition camcorder and post-processing of camerawork generation that traces regions of interest. However, automatic recording systems in high-definition are still uncommon and expensive.In this paper, we describe the automated lecture recording system developed in our lab based on years of experience in manual lecture recording in classrooms. In the system, we use an AVCHD camcorder and microserver for automated recording. The camcorder makes high-definition video capture boards unnecessary since it records videos as files on its filesystem; capturing now becomes an easy task of copying files. With this idea, we can make the system small and cost effective. Lectures are automatically recorded according to the schedule specified by iCalendar data, and recorded videos are automatically processed with a camerawork engine we have developed to generate NTSC resolution videos.

Abstract: This paper discusses the 4.7-GB digital versatile disc plus rewritable (DVD+RW) system as a future replacement for the video cassette recorder (VCR). It is shown that the digital versatile discs can be recorded in a fully compatible manner with the existing DVD-video standard and players. The compatibility issue is addressed from the perspective of the DVD-video physical and logical formats.

Abstract: Under a device use environment in which a plurality of video-signal formats are present together, an operation of a video signal on a medium is performed in accordance with a proper video-signal format. In a UIAppInfo within a basic file of a loaded medium, reading is performed to detect which is set to 1, Is60 or Is50, and it is determined whether the read video-signal format matches a video-signal format supported by a target apparatus. In a case in which they match, use of the medium such as recording or playback is started; however, in a case in which they do not match, the use of the medium is not performed. The recording of streams of different video-signal formats is not performed on the same medium, the recording being a recording operation that is not allowed by AVCHD.