Save recording in a short duration after the scheduled start time
Bit Rate
Bit rate is the bit number per unit time in data transmission, usually using the unit of
kbps (kbit per second), or to say, the sampling rate. The highest the sampling rate per unit
time, the more precise the data information, and the more close the transmitted file to the
original file. But the file size will increase as the sampling rate increases, thus almost all the
encoding standard is focus on acquiring least distortion with smallest video size, and the CBR
(Constant Bit Rate) and VBR (Variable Bit Rate) is originated from it. On the side of audio
encoding, the higher the bit rate, the less the compression ratio and sound distortion, but the
encoding algorithm is different for different audio players, and the bit rate is not the only
measure for audio quality. For instance, it is not exactly that the sound quality of lower bit
rate mp3 files is not as good as higher bit rate wma file, especially after using VBR encoding.
In some occasions, VBR can even achieve better audio quality than CBR on the same encoder.
Stream Type
Compressed stream type containing both video stream and video & audio stream.
Video & Audio Stream
Multimedia stream that contains both video and audio information
Video Stream
Pure video stream
Video Frame Rate
Video frames per second
Frame Rate
FPS, stands for frames per second, the value of information data flow of dynamic images.
Continuous playing of static images will enable the feeling of dynamic video, and the
movements will be much fluent as fps value raises.
Frame Type
I frame (Intra code frame) is intra-frame encoding frame, P(Predicted frame)is forward
forecast coding frame according to I or the previous P frame, B(Bi-direction frame)is
interpolation frame calculated by neighboring I, P or P, P frames.
Dual Stream
It means a camera of video images passing through the video coder, and output 2
independent bit streams. The resolution, frame rate, bit rate and other parameters of output
bit stream can be set independently. The output dual steam can meet different demands, for
example, one for hard disk storage and the other for network transmission.
Watermark
It means to insert hidden information, i.e. digits, serial number, characters, logo, etc
into digitalized multimedia files by signal processing technology. Such marks are usually
invisible, and can only be extracted by specially designed detectors to get the purpose of
copyright protection.
TV Wall
TV wall is formed by integration of multiple display units. A large-screen TV wall
system is consisted of TV wall units, TV wall processor and TV wall interfaces. Generally
speaking, any display unit can be adopted to TV wall system. TV wall processor can do image
processing (divide and enlarge) to a complete standard video input signal and output to M*N
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