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Video Support #21
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See this thread for a similar discussion for a Comelit system: |
I can confirm that the resolution is 320 × 240 since the images saved on the SD card of the indoor station do have that resolution. They are saved as BMP files but I guess this is irrelevant. |
A bit off topic, but while I was setting up mobile notifications when someone hits our door bell I noticed that the Home Assistant mobile apps supports attaching a camera image/stream to the notification: https://companion.home-assistant.io/docs/notifications/notification-attachments#automatic-snapshots I initially thought I don't need this, but of course, once I got the adapter running and read this, I immediately thought: that would be cool :-) |
For buffering video |
I have a question to the owners of video installations: Is the video parallel to the audio conversation? |
Video and audio are transmitted in parallel. Not sure if audio is duplex but I think it is. |
Hmm, we need someone with a video installation and at 40MHz bandwidth (better 100Mhz) oscilloscope. I'm not 100% familar with analog video, but from what I understand: the standard CVBS goes down in the spectrum, overlapping with the audio range. So I would assume that the video may be FM (or even AM, but I don't think so) modulated to shift it to higher frequencies. Or audio / video is interleaved? Don't know if such a thing could work |
Any recommendations for an affordable USB oscilloscope that would satisfy those requirements? My GIRA system has video. |
Small status: |
Update (slow as I do not own a video bus): I measured today via SDR (hackrf) and couldn't identify the modulation frequency. So I either need to setup a wired coupler for the SDR (without destroying the sensitive SDR RF input) or I need to use the way more expensive oscilloscope (which I tried to avoid 😉 ). TLDR: Easy option one (cheap oscilloscope): 👎 meeh, its getting more complicated 😅 |
You got this! Curious to hear how they did it! |
There is currently no video support planned until bus protocol reverse engineering is done and interfacing with the digital bus is fully working. Creating this Issue as a placeholder for possible future work and to inform others who might be looking for video support.
Details concerning possible Audio support are tracked in Issue #20.
Per @DaSchaef there is sufficient evidence to assume that video is transmitted in analog just like the audio part of the communication with the (door) station in a resolution of roughly 320x240 pixels (or respective lines) per @jschroeter . It is assumed that an ADC would be needed to convert the analog signals to digital for the ESP32 and then send them via SIP/RTSP/RTP to a destination on the network. Issues outlined in #20 apply, in addition to those the extra bandwidth needed to digitize the video signal from the wire is going to be of concern.
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