That does look incorrect, but you can't address it as GPIO 128 from Linux as you need to direct it to the correct GPIO controller driver.
I'd expect it to be
For a third party camera there is very little support that can be offered. MMAL provides timestamps on all frames via the PTS field. It's always recommended to look at those values rather than assume anything. The other concern I'd have is that memory says the CSI2 receiver will drop incoming frames...
I know that that setting is intended to force behaviour for HDMI 1.4. What you were reporting was almost exactly as if you had engaged it, hence requesting you check it. All of the display resolution setup and selection on the Pi4 is now using standard Linux code. It'd be interesting to know if a Li...
Sorry, I don't buy into the Digione claims over jitter. A lot of audiophile debate could be confused with homeopathy rather than science. For reference, my background is a (now slightly rusty) Masters in Electronic Engineering and Music Technology, and nearly 30 years in live sound and home recordin...
So 16bit source material (eg CD) has a signal to noise ratio of 96dB (6dB per bit of signal). Going significantly over that is redundant. Your amplifier quotes a spec of 100dB S/N from the CD or tape analog inputs. I'd expect the digital inputs to be a smidge quieter than that. Frequency response on...
Generally keep things digital until the last minute. You say "I have an optical (Coaxial) input into my amp, but I understand that the internal DAC will be dated so better to get something else." Have you checked out the specs of your amp? Do you need 192kHz 24bit playback? Can you tell the differen...
I hadn't provided the command line lightly, I'd tested it beforehand and it works. There is obviously something different on your system. My next guess is that you haven't given the gpu sufficient memory to be able to do 2 simultaneous decodes. Have you increased gpu_mem in config.txt at all? The de...
Various of the hardware blocks on the pi4 can only access the bottom 1GB of RAM. Gpu_mem, the cma heap, and a small amount of working space have to fit into that bottom 1GB. Default cma heap is 256MB. 768MB of gpu_mem will try putting too much stuff in that space. There is a move to shift away from ...
Ah, got it. Thanks, I'll write to the developer with what you've told me and see if they respond. Little point as they are doing it the standard way. If you want to solve the problem on the Pi now then you need to do it a non-standard way, or wait for the standard API to be implemented (see the git...
Bearing in mind that my tech-ese is at the pidgin level, I'd guess that what you're saying is that although one might be able to install Redshift on the Pi, it won't actually have any effect on the 7" screen because reasons (which I have confirmed through observation - Redshift doesn't appear to ch...
Is your output port format configured correctly? Decode of compressed formats normally needs to handle the format changed events to ensure they match up with what the codec detects. Sample MMAL JPEG decode app - https://github.com/6by9/userland/blob/hello_mmal/host_applications/linux/apps/hello_pi/h...
I suspect that redshift alters the gamma parameters of the display pipeline via xrandr or KMS. That relies on the underlying display driver supporting a user-supplied gamma look up table, and currently the Pi doesn't(*). There is a mailbox service call on the Pi0-3 that does allow you to push in a g...
omxplayer : I get the "have a nice day" message, but no window opens, nothing happens. I am 100% sure of my video format, I tried several ones that run smoothly on a pi3 with omxplayer. Tried a few options like --display=2, --display=7 (found here : https://lb.raspberrypi.org/forums/viewtopic.php?f...
Thanks. For the non-legacy drivers, is the GPU still providing acceleration for OpenGL? Or does "the kernel provides OpenGL" imply that it's all done on the CPU and hence slower? You have a number of different core hardware blocks in play here: - ARM CPU - Videocore VPU (SIMD multi-purpose processo...
Can someone at Pi Towers please clarify the official position on this? As I understand it: The official 7" display uses the Toshiba TC358762 This chip gets set up by the GPU firmware before the ARM even boots (it must since it displays the rainbow square) So does this mean that if we do manage to g...
So you can add any DSI display to the vc4-kms-v3d stack by writing a suitable Linux kernel panel driver. It requires a modicum of understanding of DSI and how KMS hooks together, and a complete datasheet for the panel, but https://github.com/anholt/linux/wiki/Raspberry-Pi-and-other-MIPI-DSI-display-...
I've just tested it for myself on a Pi4 with B101 board. Edited config.txt to add dtoverlay=tc358743 dtoverlay=tc358743-audio Rebooted. pi@raspberrypi:~ $ v4l2-ctl --set-edid=file=1080P50EDID.txt --fix-edid-checksums CTA-861 Header IT Formats Underscanned: yes Audio: yes YCbCr 4:4:4: no YCbCr 4:2:2:...
So my question is: Is v4c driver compatibile with dpi24 also in CM3+? Is this a driver problem or a bad config.txt problem? Seeing as your query relates to CM3, whilst this thread is about Pi4 (see the title), you would have been better off starting a new thread. vc4-kms-v3d replaces ALL display co...
I think you've misunderstood what the NoIR camera module is. It is a sensor which has no IR filter, therefore it is sensitive to IR as well as visible light. There is no switch in or out of IR mode. A scene illuminated by sunlight will result in strange colours as the IR component will be picked up ...
Check the wiring for the data line.
No BCK/SCK or LRCK/WFS would probably give you sync errors, whilst no data line would give silence as it doesn't require any transitions.
Reduce your pipeline down to just the audio gst-launch-1.0 -vvv -e alsasrc device=hw:1,0 ! audio/x-raw,rate=48000 ! queue ! voaacenc ! aacparse ! matroskamux name=mux ! filesink location=foo.mkv or try using arecord to record just the audio. Check with "arecord -l" that hw:1,0 is the correct alsa na...
Pi3 and Pi4 should behave identically. If --win isn't sepcified then as of https://github.com/popcornmix/omxplayer/commit/a70e9b4b38e9568eac5e7ec8d19b5b4b70165bf5 (nearly a year ago) it adds a flag OMX_DISPLAY_ALPHA_FLAGS_DISCARD_LOWER_LAYERS to remove all layers lower than the video (eg the framebu...