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by MRV
Tue Dec 08, 2020 10:53 pm
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

I have only used a hdmi capture card but replacing libx264 with h264_omx should work? At least that is the old rpi3 style, I think there is more modern ways now. Can test on my rpi4 later. Thanks for the heads up regarding h264_omx. This uses the GPU for encoding I assume? I did try it quickly and ...
by MRV
Tue Dec 08, 2020 8:37 pm
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

Seems like you are using software to do the encoding? Use the HW accelerator instead if you want better efficiency. Probably 5-10x better in terms of power. Also the ultra fast preset is not really a good use of libx264 (see https://dev.beandog.org/x264_preset_reference.html, you are missing out on...
by MRV
Mon Nov 30, 2020 2:58 pm
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

Based on the [ TECHNICAL ] details in my first post, does the Linear LTC3533 look like a good candidate to boost the LiPo?
http://www.analog.com/media/en/technica ... 3533fc.pdf
by MRV
Sun Nov 29, 2020 2:01 pm
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

You need to rework your design. BQ24075 doesn't have a boost regulator to step up the battery voltage. The output varies between 5V when charging and the battery voltage when it isn't charging. The CM4 PMIC will trigger the undervoltage lockout and shutdown because you're far below the minimum volt...
by MRV
Sun Nov 29, 2020 11:09 am
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

Thanks Stuart. It looks like the problem may be related to the absence of a LiPo boost converter on the board. You agree? Quite possibly in this situation, but as W. H. Heydt also posted above, even with that fixed you need to look at your actual power usage for your application. The calculation us...
by MRV
Sun Nov 29, 2020 10:54 am
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

When you are running off USB-C with the video recording running how much current is being pulled from the 5V input? Is there a software utility that lets me monitor this via CLI? No, this is information you need to get from where the power is coming from - the Pi has no way of knowing (you want tot...
by MRV
Sun Nov 29, 2020 10:08 am
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

You need to rework your design. BQ24075 doesn't have a boost regulator to step up the battery voltage. The output varies between 5V when charging and the battery voltage when it isn't charging. The CM4 PMIC will trigger the undervoltage lockout and shutdown because you're far below the minimum volt...
by MRV
Sun Nov 29, 2020 9:56 am
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

Re: CM4 + Lithium Ion

stuartclark wrote:
Sat Nov 28, 2020 11:09 pm
When you are running off USB-C with the video recording running how much current is being pulled from the 5V input?

Is there a software utility that lets me monitor this via CLI?
by MRV
Sat Nov 28, 2020 10:45 pm
Forum: Compute Module
Topic: CM4 + Lithium Ion
Replies: 32
Views: 1680

CM4 + Lithium Ion

[ BACKGROUND ] We’ve developed a custom CM4 carrier board that can be powered by either a direct USB-C connection or an internal 1700mAh Lithium ION Polymer battery. Our device is designed to record video and audio synchronously. We accomplish this via the following CLI command: raspivid -t 0 -n -w...
by MRV
Mon Nov 16, 2020 6:03 pm
Forum: Advanced users
Topic: Gstreamer —> V4L2 Stereo
Replies: 4
Views: 292

Re: Gstreamer —> V4L2 Stereo

mahjongg wrote:
Mon Nov 16, 2020 5:41 pm
No, because these is another poster zwieblum that posted in this thread,
And unless he agrëes too, i can not delete the whole thread, sorry

P.s. there does not seem to be a duplicate. The link jou provided does not work
Fair enough. No problem.
by MRV
Sat Nov 14, 2020 3:12 pm
Forum: Advanced users
Topic: Gstreamer —> V4L2 Stereo
Replies: 4
Views: 292

Re: Gstreamer —> V4L2 Stereo

OP's post deleted upon user request, can only delete his post, not the reply. Can you please delete the entire forum Topic (Gstreamer —> V4L2 Stereo) and the duplicate here https://www.raspberrypi.org/forums/viewtopic.php?f=133&t=290851 I created both but they are no longer needed. Thanks. MRV
by MRV
Mon Nov 09, 2020 9:04 am
Forum: Wanted
Topic: HW designer for a custom RPi CM4 carrier board
Replies: 9
Views: 1291

Re: HW designer for a custom RPi CM4 carrier board

Go to https://www.gumstix.com/community/special-offer/
Right now, you can design your CM4 carrier board for free (normally it’s $2000)
All you pay for is your boards. No design fee, nothing.
Use the Gumstix Geppetto online app: https://geppetto.gumstix.com/#!/dashboard/
by MRV
Thu May 14, 2020 5:46 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

Re: CM4 Carrier Board = 1080p encode limit

With the new HD cameras now released , its such a shame the Pi and CM cannot encode beyond 1080p. That’s a serious, serious tragedy. Like offering racing tires for pickup trucks.
gsh wrote:
Sat Mar 14, 2020 6:55 pm
That is correct, the CM4 device will have significantly different pinout
by MRV
Sat Mar 14, 2020 5:15 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

Re: CM4 Carrier Board = 1080p encode limit

From what I understand, if I design a carrier board for the CM3+ now, it will not directly support the CM4 (or whatever it's called). Is this not correct? Looks like CM4 is way down the road. Summer probably. Such a shame. I've been waiting for its release to begin my new company's VR hardware. As t...
by MRV
Sat Mar 14, 2020 4:16 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

Re: CM4 Carrier Board = 1080p encode limit

Looks like CM4 is way down the road. Summer probably.
Such a shame. I've been waiting for its release to begin my new company's VR hardware.
As the next iteration of the CM will undoubtedly require a new carrier board design, designing for the current CM3+ seems impractical at this point.
by MRV
Sat Mar 14, 2020 8:56 am
Forum: General discussion
Topic: So, what's the big new thing for this year's Pi Day (8th anniversary) ?
Replies: 130
Views: 10139

Re: So, what's the big new thing for this year's Pi Day (8th anniversary) ?

3.14 - 9:53 am - Italy
Woke up.
Went to the kitchen.
No new pies.
Back to sleep.
by MRV
Mon Mar 09, 2020 3:42 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

Re: CM4 Carrier Board = 1080p encode limit

@6by9
Thanks for clarifying that. I believe the general conclusion is that -w 1792 -h 896 is the largest stereo recording I can current accomplish using Raspivid (keeping with the law of 128). After the initial recording I could then upscale it to, say, 1920 x 960.
by MRV
Fri Mar 06, 2020 6:40 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

Re: CM4 Carrier Board = 1080p encode limit

Yes, I actually mean 1080x1080 (or 1024x1024) @ 30fps. The goal is to make a single file comprising the two images combined horizontally ---> to make, for example, a 2048x1024 file. I know currently recording stereo imagery via Raspivid cannot exceed 1920x1080. (actually Raspivid is restricted to -w...
by MRV
Thu Mar 05, 2020 10:28 pm
Forum: General discussion
Topic: So, what's the big new thing for this year's Pi Day (8th anniversary) ?
Replies: 130
Views: 10139

Re: So, what's the big new thing for this year's Pi Day (8th anniversary) ?

While 4k would certainly be nice, I would be happy with any real improvement to the 1920x1080 encoding limit. Even 2.5k or 3k h264 @30fps would be great!
by MRV
Thu Mar 05, 2020 9:41 pm
Forum: General discussion
Topic: So, what's the big new thing for this year's Pi Day (8th anniversary) ?
Replies: 130
Views: 10139

Re: So, what's the big new thing for this year's Pi Day (8th anniversary) ?

Did you see any mention of a display company in my post? No. (Somebody else's post, yes) Mentioning a need for better encoding is just that and has nothing to do with anything else you add to it. Nothing to do with a display company or anything else. Better, higher encoding resolution would be nice....
by MRV
Thu Mar 05, 2020 9:28 pm
Forum: General discussion
Topic: So, what's the big new thing for this year's Pi Day (8th anniversary) ?
Replies: 130
Views: 10139

Re: So, what's the big new thing for this year's Pi Day (8th anniversary) ?

4k encoding is not possible on the current SOC.
Jamesh wrote:
Not on the Pi4, it would require changing the SOC (or the SoC being redesigned to have an encoder).

In fact H265 encode in HW is VERY difficult.
by MRV
Thu Mar 05, 2020 6:13 pm
Forum: General discussion
Topic: So, what's the big new thing for this year's Pi Day (8th anniversary) ?
Replies: 130
Views: 10139

Re: So, what's the big new thing for this year's Pi Day (8th anniversary) ?

What the Raspberry Pi needs is higher encoding capabilities, not just viewing.
dickon wrote:
Thu Mar 05, 2020 6:09 pm
Well, yes. It's a display. Why would it need an encoder?
by MRV
Thu Mar 05, 2020 6:04 pm
Forum: General discussion
Topic: So, what's the big new thing for this year's Pi Day (8th anniversary) ?
Replies: 130
Views: 10139

Re: So, what's the big new thing for this year's Pi Day (8th anniversary) ?

Too bad "4K video support" means decoding support. What's needed is 4k encoding! Anything beyond the Raspberry Pi's existing 1080p encoding limitation would be nice at this point.
by MRV
Thu Mar 05, 2020 1:49 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

Re: CM4 Carrier Board = 1080p encode limit

Yes, ahem.... is the Rpi4 capable of recoding two 1080x1080 videos simultaneously at, say, 30fps (via FFMPEG perhaps)?
by MRV
Thu Mar 05, 2020 1:43 pm
Forum: Compute Module
Topic: CM4 Carrier Board = 1080p encode limit
Replies: 11
Views: 1722

CM4 Carrier Board = 1080p encode limit

I assume that a theoretical CM4 would also be limited to 1080p encoding. If so, would the theoretical CM4 be capable of recoding two 1080x1080 videos simultaneously at, say, 30fps (via FFMPEG perhaps)?

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