How to switch the recording format of Sony pmw-ex280 camera? For example, please tell me the detailed operation when switching to 1080 and 720 50p.

There are many kinds of cameras and waterproof digital cameras, and the basic principle is the same: converting optical image signals into electrical signals for storage or transmission. When we shoot an object, the light reflected by the object is collected by the camera lens and focused on the light receiving surface of the camera device (such as the target surface of the camera tube), and then the light is converted into electric energy by the camera device, that is, the "video signal" is obtained. The photoelectric signal is very weak, so it needs to be amplified by pre-amplifier circuit and then processed and adjusted by various circuits. The final standard signal can be sent to video recorders and other recording media for recording, or spread through a propagation system, or sent to a monitor for display.

Video recording format refers to the video format of recording TV programs after MP4 is connected to TV through AV interface. MP4 video recording formats mainly include MPEG, MPEG-4, WMV, ASF, etc.

Video recording format refers to the video format of recording TV programs after MP4 is connected to TV through AV interface. At present, MP4 video recording formats mainly include MPEG, MPEG-4, WMV and ASF.

MPEG is the abbreviation of moving picture expert group, including MPEG- 1, MPEG-2 and MPEG-4 (note that there is no MPEG-3, and only MPEG Layeur 3 is familiar with MP3). MPEG- 1 is considered to be the most widely used, because it is widely used in the production of VCD and the network application of downloading some video clips. It can be said that 99% of VCDs are compressed in MPEG- 1 format. (Note that VCD2.0 does not mean that VCD is MPEG-2 compressed. Using the compression algorithm of MPEG- 1, a movie with a length of 120 minutes (excluding video files) can be compressed to the size of 1.2 GB or so. MPEG-2 is applied to the production (compression) of DVD, and also has considerable application in some HDTV (High Definition Television Broadcasting) and some demanding video editing processes. Using MPEG-2 compression algorithm to compress a movie (without video files) with a length of 120 minutes can be compressed to a size of 4 to 8 GB (of course, its performance indicators such as image quality are incomparable to MPEG- 1). MPEG-4 is a new compression algorithm. By using the ASF format of this algorithm, a movie (unwatched file) with a length of 120 minutes can be compressed into a video stream of about 300M, which can be watched online. Other DIVX formats can also be compressed to about 600M, but the picture quality is much better than ASF.

MPEG-4 is based on Microsoft's MPEG-4V3 standard. The video part is compressed in MPEG4-4 format, which has high-definition quality comparable to DVD. The audio part is compressed with high quality in MP3 format. Finally, the video part and the audio part are combined into an AVI file, and the effect is enough to make us refreshing. The most amazing thing is that the compression ratio of MPEG-4 is amazing: a standard capacity optical disc can store high-definition movie programs close to the quality of DVD(MPEG2-2) for about 80 minutes. This means that even if there is no DVD drive, we can enjoy wonderful HD movies only through ordinary CD drives.

However, the current MPEG-4 is not perfect. Although it can be compared with DVD in terms of ordinary pictures, MPEG-4 is a lossy compression algorithm with high compression ratio. When the explosion, fast action and other pictures are shown in the movie, its shortcomings begin to be exposed, and the common problems such as slight mosaic and mottled color in VCD are also staged here, and its picture quality can't be compared with MPEG-2 technology adopted in DVD. I hope that the compression and decompression algorithms will be gradually improved with the production and playing software of MPEG4-4.

WMV(Windows Media Video) is a digital video compression format developed by Microsoft. WMV files usually contain video and audio parts. The video part is encoded by Windows Media Video, and the audio part is encoded by Windows Media Audio.

WMV is a streaming media format introduced by Microsoft, which is an upgrade and extension of ASF (Advanced Streaming Format) format. Under the same video quality, WMV format is very small, which is very suitable for playing and transmitting on the Internet.

Microsoft's WMV is still very influential. However, due to Microsoft's own limitations, its WMV application development is not smooth. First, WM9 is a product of Microsoft and must rely on Windows. Windows means that the decoding part should also have a PC, at least the motherboard of the PC. This greatly increases the cost of set-top boxes, thus affecting the popularity of video on demand. Secondly, the video transmission delay of WMV technology is very large, usually 10 second. Because of this restriction, WMV can only browse WM9 video files on the computer at present.

ASF is short for Advanced Stream Format. You should take this format literally. To put it bluntly, ASF is a file compression format developed by Microsoft in order to compete with the current Real player. You can watch video programs directly on the Internet! Because it uses the compression algorithm of MPEG4-4, the compression rate and image quality are very good. Because ASF exists in a video "streaming" format that can be watched instantly on the Internet, it is not surprising that its picture quality is worse than that of VCD, but it is better than that of RAM format which is also a video "streaming" format. However, it is not surprising that if you choose the best quality compressed file regardless of online transmission, the generated video file is better than VCD (MPEG 1), but in this case, the original intention of ASF development will be lost, and it is better to simply use N AVI or DIVX. However, Microsoft's Di Zi has its unique advantages. The most obvious thing is that all kinds of software support it unsurpassed.

QuickTime(MOV) is a video format created by Apple. For a long time, it only existed on Apple's MAC. Later, it developed to support WINDOWS platform, but in all fairness, it is an excellent video coding format whether it is played locally or spread on the Internet as a video streaming format. So far, it has four versions, of which version 4.0 has the best compression ratio! REAL VIDEO REAL VIDEO (RA, RAM) format is located in the application of video streaming from the beginning, and it can also be said that it is the originator of video streaming technology. It can realize uninterrupted video playback under the condition of using 56K modem to dial up the Internet. Of course, compared with MPEG2 and DIVX, its image quality is not satisfactory.