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HDMI Encoder


FAQs

This HDMI video to IP encoding board can view the current parameter configuration through the network port Web UI and modify it according to application needs. through the network port browser http://192.168.1.30/ (the IP address of the encoding board)

1. Please check the Web UI from the browser, at the below picture, if the video source input is ok, then it will show the CVBS or HDMI at the red arrow.

no video input now
no video input now

HDMI encoder can detect the video input source
HDMI encoder can detect the video input source

2. Please check the HDMI encoding board LED light is blink or not.
If it is green and blink, then the video input source is working well, if not blink, then please check the video input source is ok or not.

HDMI input encoder board encoding light is blink or not.
HDMI input encoder board encoding light is blink or not.

The encoding bitrate can be configured. The default web server is set to 0.0 to represent auto (3.12Mbps will be used internally). Customers can modify this value. For example, it is possible to configure 1Mbps~2Mbps or even lower.

GOP is required to be set to an integer multiple of the encoding frame rate (note that it is the encoding frame rate):
1. For example, if the camera inputs 1080p60, then the gop is set to 60/120/180 (it is not recommended to set too large)
2. For example, if the camera inputs 1080p25, the gop is set to 25/50/75 (it is not recommended to set too large)
3. For example, the camera input 1080i60, due to the need for de-interleaving, all the actual encoding is 1080p30, then the gop is set to 30/60/90
If your video source is CVBS, CVBS has two systems, PAL is 25fps, NTSC is 30fps
if your CVBS is PAL, then GOP set is 25/50/75, if your CVBS is NTSC, then GOP set is 30/60/90.
The larger the gop setting, the better the image quality, but the size difference between the I frame and the P frame becomes larger, resulting in the following disadvantages:
1. Large I-frames are prone to frame loss due to wireless transmission;
2. If the gop setting is large, the loss of the I frame will lead to a longer recovery time after the blurred screen;
3. The size difference between I frame and P frame is large, which will increase the transmission delay.
gop要求设置为编码帧率的整数倍(注意是编码帧率):
1、比如相机输入1080p60,那gop设置为60/120/180(不建议设置太大)
2、比如相机输入1080p25,那gop设置为25/50/75(不建议设置太大)
3、比如相机输入1080i60,由于需要去交织,所有实际编码是1080p30,那gop设置为30/60/90
从上面可以看到,由于输入相机帧率不确定,所以我们一般建议配置0(Auto)
cvbs分制式,pal是25fps,ntsc是30fps
假设是pal,那gop设置25/50/75
gop设置越大,画质越好,但是I帧和P帧的大小差别变大,产生一下缺点:
1、大的I帧容易因为无线传输的原因导致丢帧花屏;
2、gop设置大,I帧丢失导致花屏后恢复时间变长;
3、I帧和P帧大小差别大,会增加传输延迟
  1. We can modify the TS stream over UDP, but the TS stream is a non-standard TS stream that we have modified, which needs to be interpreted by our decoder board or special player (Download).
  2. If you agree with the RTSP protocol, VLC can play it; if you only agree with the TS stream (due to our non-standard modification), VLC cannot decode and play it, so we must use our special player. (Download).
  3. If you want to switch to the standard MPEG-2 TS stream to play with VLC, our software engineer can customize the firmware for you (this will take a few days) for an additional fee of USD500.
  4. We use non-standard mpeg-2 ts streams primarily for the following reasons:
    1. The standard mpeg-2 ts stream has too much overhead outside the effective data, making it unsuitable for use with cofdm;
    2. The standard mpeg-2 ts stream is difficult to implement the aes encryption function;
    3. The standard mpeg-2 ts stream is difficult to achieve serial port transparent transmission (used with our decoder board)
  5. If you don't need our decoder board, encryption and serial port transparent transmission, it is also possible to use standard mpeg-2 ts stream
  6. It is recommended that you try our player; in real-time performance, our player outperforms vlc.
    The vlc player's algorithm does not take into account real-time performance; instead, it will constantly adjust its cache (only increase but not shrink). As a result, the longer it is played, the longer the delay may be (especially when used with a wireless link)

1. SSL certificate is HTTPS protocol, our products do not support it now, only HTTP.
2. The default encoder board through the RTSP protocol, RTSP is not encrypted. You can set a longer password. And change it frequently.
3. If you want to encrypt, you need to use a pair of our codec boards (with encoder and decoder board as TX and RX), with UDP protocol, and they are using aes256 encryption. (Just like the bank level.)

Yes, Sure, please contact us. Let me list your demand at the below.

1. We need to take a composite analog PAL video signal and transmit it using h264 over MPEG2 TS. OK
2. The output must be playable through VLC. OK
3. UPD://@1030. OK
4. The output network stream packet should be 188 bytes standard mpeg2 TS. OK
5. Compression scheme is h. 264, CVBS PAL input and IP output. OK

Thanks.
Only CVBS composite video input, we once designed and produced 42x37mm, CVBS composite video source to IP encoder board. (No HDMI input)
If both CVBS and HDMI video input, we can not make it smaller. Except that you allow the use of two PCB boards stacked.

ping encoder board default ip address 192_168_1_30
ping encoder board default ip address 192_168_1_30

Please follow the checkpoints below to confirm.

  1. After connecting the encoder board with your computer by ethernet cable, the LED of RJ45 connector should be blinking or not. (to check the ethernet connection is ok or not)
  2. Is your computer configured with 192.168.1.x network segment ip?
  3. Have you modified the default IP address of the encoding board? If the IP address changed, maybe you can download and use the below software to find what IP address now.
  4. Or Directly connect the UART cable of the encoding board to the computer, and use the serial port debugging assistant to send the ATGIP_ command.get ip address command

    Format

    ATGIP_

    Example: ATGIP_

    Parameter

    No

    Use

    to query the current IP address of the receiving end

    Return value

    Example:

    ATGIP_

    ATGIP192.168.0.215 OK

    Remark

    1. query command
  5. More COFDM UART AT commands, please check this link. https://ivcan.com/encoder-modulator-decoder-demodulator-module-parameter/

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HDMI Video Sources Input IP Ethernet Output encoder, VLC RTSP operation

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