USB HDMI Capture

Playground Hacks
#161

Just spins


2025/03/10 01:30:22.437841 [TNR] Opened connection to M3U-usbhdmi for ch201 USB HDMI Capture
2025/03/10 01:30:22.816777 [HLS] ffmpeg: capture-usb-hdmi:  [video4linux2,v4l2 @ 0xf2a5680] Dequeued v4l2 buffer contains corrupted data (0 bytes).
2025/03/10 01:30:22.843060 [HLS] ffmpeg: capture-usb-hdmi:  Guessed Channel Layout for Input Stream #1.0 : stereo
2025/03/10 01:30:22.843353 [HLS] ffmpeg: capture-usb-hdmi:  [video4linux2,v4l2 @ 0xf2a5680] Dequeued v4l2 buffer contains corrupted data (0 bytes).
2025/03/10 01:30:22.853388 [HLS] ffmpeg: capture-usb-hdmi:      Last message repeated 7 times
2025/03/10 01:30:22.853396 [HLS] ffmpeg: capture-usb-hdmi:  [video4linux2,v4l2 @ 0xf2a5680] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
2025/03/10 01:30:22.853400 [HLS] ffmpeg: capture-usb-hdmi:  [video4linux2,v4l2 @ 0xf2a5680] Dequeued v4l2 buffer contains corrupted data (0 bytes).
2025/03/10 01:30:23.562761 [HLS] ffmpeg: capture-usb-hdmi:      Last message repeated 22 times
2025/03/10 01:30:23.562789 [HLS] ffmpeg: capture-usb-hdmi:  [alsa @ 0xf2a75c0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 256)
2025/03/10 01:30:50.657294 [SNR] Buffer statistics for 192.168.1.131 (Casey’s iPhone) for ch201 USB HDMI Capture: buf=0% drop=0%
2025/03/10 01:30:50.657344 [ERR] Error during stream M3U-usbhdmi ch201 USB HDMI Capture: read |0: file already closed
2025/03/10 01:30:50.657351 [TNR] Closed connection to M3U-usbhdmi for ch201 USB HDMI Capture
2025/03/10 01:30:50.678512 [HLS] ffmpeg: capture-usb-hdmi:  av_interleaved_write_frame(): Broken pipe
2025/03/10 01:30:50.703383 [HLS] ffmpeg: capture-usb-hdmi:      Last message repeated 32 times
2025/03/10 01:30:50.703427 [HLS] ffmpeg: capture-usb-hdmi:  Error writing trailer of pipe:: Broken pipe
2025/03/10 01:30:50.703435 [HLS] ffmpeg: capture-usb-hdmi:  Error closing file pipe:: Broken pipe
#162

No change - submitted dde049dc-181a-44ac-ae35-fd6563894310

#163

@tmm1 sent you a pm on this

1 Like
#164

capture://v4l2/video0
Using the device you linked, I can get video but no audio using Ubuntu 24.04.2. Video looks great!

I tried the last one you posted as well, but that just spins.
capture://v4l2/video0/hw:Video,0/?framerate=60

#165

Hi, have you had any luck on getting the audio working? The picture is coming through perfect now.

#166

Not with //capture. I get the same results as @timstephens24 above. I did find an hdmi audio stripper in my parts bin and I am having better results combining the separate audio with the video and streaming it to channels via m3u. It seems like Linux doesn’t like capturing the audio and video from the usb, it will capture one or the other but not both at the same time. I might share some scripts if I can get something working. I’m working on starting and stopping the m3u transcode based on when the channel is tuned in and out.

#167

Sounds good thanks. Do you think I'd have better luck with a windows 11 pc? It's a shame that Linux doesn't like doing both. I get both in VLC. Fingers crossed you get something stable with the audio stripper

#168

Yes I think windows is working much better based on the above posts. I haven’t tried in windows myself though.

#169

Does this help?

#170

Also found this:

https://trac.ffmpeg.org/wiki/Capture/V4L2_ALSA

@tmm1 @Rice

#171

The Dell OptiPlex Micros are an excellent Channels bang for your buck. They have transcoding and I5 power with very low power usage.
You can get a 5060 under $100 on eBay and it will legitimately run Windows 11, a bunch of Dockers, and record 10 things at a time.
I just migrated to a 5090 ($160) for the extra cores and now I can record 20 things at once, run 8 Dockers, and use multiple threads to process commercials.
Through experimentation, I found that the I5 processors were power efficient but needed an I7 to run Chrome Capture for Channels. I went back to the I5 and ADBtuner so I wouldn't hear the fan running all day.
I can't tell you that a 7-year-old I5 processor will run the USB HDMI Capture hack, but it's gotta be better than the Pi.

1 Like
#172
#173

Can confirm working good!!

1 Like
#174

Try adding /System/Library/CoreServices/launchservicesd under camera/audio/screen-recording permissions maybe?

https://developer.apple.com/forums/thread/772886?answerId=821956022#821956022

2 Likes
#175

2025/03/17 06:59:02.710788 [TNR] Opened connection to M3U-Test for ch9031 USB HDMI Capture
2025/03/17 06:59:02.899077 [HLS] ffmpeg: capture-usb-hdmi: [video4linux2,v4l2 @ 0x17986330] Could not parse framerate '60/'.
2025/03/17 06:59:02.899244 [HLS] ffmpeg: capture-usb-hdmi: /dev/video0: Invalid argument
2025/03/17 06:59:02.899538 [ERR] Error during stream M3U-Test ch9031 USB HDMI Capture: exit status 1
2025/03/17 06:59:02.899579 [TNR] Closed connection to M3U-Test for ch9031 USB HDMI Capture
2025/03/17 06:59:02.899720 [SNR] Buffer statistics for 192.168.1.xxx (Pixel 8 Pro) for ch9031 USB HDMI Capture: buf=0% drop=0%

Hi, this is what I'm getting now. Do I need to edit my config in channels? I am still getting video with the config that doesn't mention the audio or frame rate

Thanks

#176

No diff, sorry.

314f1c76-c47b-47b4-8dc4-d0269198936c

1 Like
#177

Using this setting, this is the error message I am getting.

025/03/17 17:46:00.388092 [TNR] Opened connection to M3U-Test for ch9031 USB HDMI Capture
2025/03/17 17:46:00.665595 [HLS] ffmpeg: capture-usb-hdmi: [video4linux2,v4l2 @ 0xf773330] Dequeued v4l2 buffer contains corrupted data (0 bytes).
2025/03/17 17:46:00.666058 [HLS] ffmpeg: capture-usb-hdmi: Unknown input format: 'alsa'
2025/03/17 17:46:00.685481 [ERR] Error during stream M3U-Test ch9031 USB HDMI Capture: exit status 1
2025/03/17 17:46:00.685610 [TNR] Closed connection to M3U-Test for ch9031 USB HDMI Capture
2025/03/17 17:46:00.686348 [SNR] Buffer statistics for 192.168.1.XXX (Living Room TV) for ch9031 USB HDMI Capture: buf=0% drop=0%

#178

Rpi is not suitable for this feature

1 Like
#179

Thanks, I'll invest in a windows 11 pc. Are all N95 devices suitable? Belink aren't commonly available in the UK.

Thanks

1 Like
#180

Any modern Intel machine is fine

1 Like