How did they make a Dash Camera ?

[toanjunifer]

Hi,

After a month, I research and execute some solution to make a device to capture and record video from camera (webcam and CSI ). I used iMX6 Solo (Cortex-A9 1Ghz - VPU H264- with GPU<I dont know how to use GPU> ). But result is not good at all. I used both OpenCV- Python and C++.

I used USB camera give me: 720p (1280x720) - save to MP4 file - around 5 FPS.

But when I search CPU of my Dash Camera which I bought. CPU is only Cortex-A7 400 MHz with some multimedia feature(VPU, Codec,...).But It can record and fullHD 1080p with 30 FPS with some overlay.

I admit that they optimize so good. But I ask myself: "How can they do that ?"

So, someone can tell me:

1. Did they use Linux OS ?

2. What did they use to record video ? (I also used FFMEPG, GStreamer but result isn't good)

3. Does camera resolution is importance ? With my case, I used camera HD but default resolution is only 640x480. Should I chooese other camera with default resolution is 720p. 

Thank you so much,

Toan

[joanxie · Accepted solution]

for VPU, imx6s should can capture 1080p@30 for h.264, you can use the gstreamer or unit test to test this,

you can refer to the chapter 7.3.6 Video recording of enclosed file

[toanjunifer]

Thank you for your reply. It's so helpful.