視訊編碼器解碼器

1. Vcan1681 supports SDI and PAL.
https://ivcan.com/p/hdmi-to-ip-encoder-modulator-module-board-cvbs-hdmi/

2. We have two firmware to support H265 and H264 encoder and decoder.

1. Max supports 1080P.
2. HDMI input supports 4k.

We need to ask the engineer, please tell us the details of the video decoder if you have.
We also have video encoder and decoder board, if you both us ours, then it is no problem.

The video bitrate is configurable by the customer (使用者).

你說的是HDMI輸入還是AV輸入 (support two video types), 或者您需要 HDMI 和 AV 來支援兩個同時輸入?

Q: We need to have HDMI and AV to support two simultaneous inputs.
A: 好的. Our firmware engineer will some days to make a new firmware to meet this function you need. I will upgrade it and show you the test video. https://youtu.be/izdFa1nw7u8

維康: Please help to confirm that HDMI and cvbs can be supported at the same time, 但音訊只能選擇兩者之一 (系統根據視訊存取情況選擇HDMI音訊/類比音訊), is it ok for you?

客戶: We don’t need audio, so do what is the best for you.

維康: Our software engineer has made a software for you. Please check the pictures in the attachments.
Now it supports an HDMI camera and CVBS camera.

客戶:
我已經用我們的系統多次測試了您的編碼器. 整體運作良好.
But we have one big issue to be able to validate its usage :
Whenever we turn on the system Camera and the encoder at the same time we are unable to read the “主流”, 我們只能讀取 “子流”.
我們必須 “重新啟動” 編碼器透過網路介面使其工作: after the reboot we can directly read the mainStream.
We tried with both VLC and GStreamer.
我們可以嘗試什麼讓兩個串流在啟動時都可讀 ?

維康:
在我們的工程師看來, 要嘛是攝影機辨識問題，要嘛是客戶使用問題.
懷疑闆卡無法辨識客戶的HDMI相機.
這很容易驗證 (如果無法存取子流, 很難驗證).
登入編碼器板的Web伺服器，可以在影片頁面看到攝影機辨識狀態.

維康:
影片頁面只會顯示一台攝影機的辨識狀態. 如果同時連接並辨識 HDMI 和 AV 攝影機, 影片頁面會顯示HDMI相機的辨識狀態 (例如 1080p60):
只要HDMI攝影機能正常辨識即可, 主流可以正常訪問.
如果 HDMI 攝影機無法正常識別, 請再次檢查板上的HDMI接線和電源 (請注意，這是一個電源循環, 不是網頁上的軟體重啟)
另外, 該板使用隨機 Mac 位址, 所以每次重開機時Mac位址都會改變.
對於具有 ARP 快取的設備 (例如個人電腦), 重新啟動後, 這將是暫時的 (幾秒鐘) 無法從網路存取開發板. , 逾時後重新發起arp請求之前我們無法訪問 (表現為重啟後幾秒鐘內無法ping通編碼板)
所以, 我猜還有一種可能是當客戶接上主流的時候, 由於以上原因無法訪問. 然後當客戶訪問子流時, arp快取刷新，客戶可以訪問, 但客戶並沒有重新審視主流.

“每當我們同時開啟系統相機和編碼器時, we cannot read the “Mainstream”, we can only read the “subStream”.“

維康:
從你這裡的描述來看, 看來你的相機是在我們的編碼板之後啟動的. 請先啟動相機, 然後通電啟動我們的編碼板來嘗試一下. 可能不是同時開機. 開機順序也很重要. 例如, 您的相機啟動需求 10 秒, 但我們的編碼器板啟動只需要 5 秒.
因為我不確定你的相機開機後初始化是否很慢.
因為我們的編碼器板啟動速度非常快, 可能是啟動我們的編碼器板後相機還沒初始化, 這可能會導致一些意想不到的問題. This can also explain why “We have to “Reboot” the encoder via the web interface to make it work: after the reboot we can directly read the mainStream.”, 因為當你的網頁重新啟動編碼器板時, 相機已經初始化.
所以, 最終建議如下 (我盡力把想到的都列出來，讓大家分別測試一下);
查看Web伺服器的影片頁面，確認HDMI攝影機是否正常識別 (您可以將螢幕截圖發送給我們). 只要相機能正常識別, 主流可以訪問;
建議先在cmd下ping編碼板, 然後在vlc下訪問mainStream和subStream，避免因為隨機mac問題誤認為Mainstream無法訪問.
讓您先啟動相機 (幾秒鐘), 然後通電啟動我們的編碼板來嘗試 (參見上述原因)
Follow your original operation of “turn on the system camera and the encoder at the same time”. When the problem “we are unable to read the “mainstream”, we can only read the “subStream”.” is reproduced, 請勿透過網頁重啟編碼板, 但可以在相機和編碼板之間熱插拔 HDMI 電纜. 我認為這只是熱插拔操作 (因為我懷疑是插件檢測問題導致相機無法連接編碼板. 發送HDMI訊號).

客戶:
I can always read the subStream. The mainStream only after reboot.

維康:
Then our encoder board can detect your camera.
Please do a test.
讓您先啟動相機 (幾秒鐘), 然後通電啟動我們的編碼板來嘗試.
The engineer worries about that your camera startup needs 10 秒, 但我們的編碼器板啟動只需要 5 秒.
Please do this test to rule out the possibility of different startup times.

維康:
When you are testing, it is better to adjust the setting back (red words) or see the below picture.

客戶:
The encoder board and the camera are both powered on at the exact same time. It is likely that the camera startup takes a bit longer than the encoder board.

I confirm that the camera seems to be not recognized on startup “CVBS pal” is displayed at the top.

I can ping the board fine before trying to read both streams

When I start my camera first (幾秒鐘), then power on (15 seconds later) and start the encoding board, I can read the stream just fine.
If I “turn on the system camera and the encoder at the same time”. And then hot plug the HDMI (15 seconds later), I can read the stream just fine.

What can I do to be able to read the mainStream without having to do on of these things ? Send an http request reboot with my software, a few seconds after startup ?

維康:
出色地, that proves my guess right. For our other customers, the camera and our encoding board are all powered on at the same time. The cameras can recognize our encoding board normally and send out HDMI signals. Only a few customers have encountered such problems using their customized HDMI cameras. The following is Solved by customers themselves (modifying their camera settings/changing cameras).

客戶:
Do you have the version of the software you develop for us? We will precise it in our PO.

維康: The firmware version is v6.5.5a for your device.

1. From the photo you showed, we found that the capacitor and inductor in the lower left corner were damaged due to external force. Perhaps they were knocked off during packaging and transportation, and your company accidentally knocked them off during operation.

The highlighted ones are the missing devices, 哪些是:
1、C176：CAP,10核因子,+/-10%,X7R,1000V,SMD1206
2、C21：CAP,22UF,+/-20%,X5R,6.3V,SMD0603
3、R34：FB,120R@100M,+/-25%,3A,SMD0603 （magnetic beads）

Please try to find the same parts, replace them and then check carefully to see if there are any other missing parts.

If you still have questions, 請聯絡我們.

客戶:
this faulty part is used to operate which circuit?

維康:
1.5電源電壓, powering DDR， 請檢查下面的圖片.

客戶:
We replaced the components according to your advice, the encoder is not functional.
另外, we noted other quality problems with the welds, several manual reworks.
How can we proceed with a standard exchange under warranty?

維康:
Don’t worry about it, please send it back to us, and we will change a new one for you.

The engineer said that the ONVIF protocol is not fully supported. It depends on your specific requirements.
The video player supports RTSP, 可見光通信, Easyplay, and protocol support UDP player.

Our video encoding board supports two channels of video at the same time, one is HDMI video stream and CVBS video stream encoding.

No now.