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| video_grabbing_issues [2017/10/07 11:23] – [Sources to be Investigated] danimo | video_grabbing_issues [2026/07/26 21:08] (current) – external edit 127.0.0.1 |
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| ====== Vide Grabbing Issues ====== | ###### Video Grabbing Issues |
| |
| This page collects known issues and workarounds for common issues with video grabbing at various conferences. Here we try to collect different issues that we've encountered, and workarounds if we are aware of any that have helped us in the past. Please add useful URLs to the end of this article. | This page collects known issues and workarounds for common issues with |
| | video grabbing at various conferences. Here we try to collect different |
| | issues that we've encountered, and workarounds if we are aware of any |
| | that have helped us in the past. Please add useful URLs to the end of |
| | this article. |
| |
| ===== Hardware Issues ===== | ##### Hardware Issues |
| |
| * **Symptom**: VGA projector loses keeps losing contact with laptop every once in a while | - **Symptom**: VGA projector loses keeps losing contact with laptop |
| * **Cause**: Typically, VGA projectors run on a 20m+ cable. Especially when used with a passive HDMI-to-VGA adapter, the SNR in the cable degrades to a point where the projector loses sync | every once in a while |
| * **Workarounds**: Try to replace or shorten the VGA portion of the connection. Try an active HDMI-to-VGA adapter. The connectivity of the projector should be part of your location scouting checklist. | - **Cause**: Typically, VGA projectors run on a 20m+ cable. Especially |
| * | when used with a passive HDMI-to-VGA adapter, the SNR in the cable |
| * **Symptom**: HDMI-connected projector shows pixel noise in an otherwise clear picture | degrades to a point where the projector loses sync |
| * **Cause**: 1) Refresh rate / interlaced vs progressive. 2) Cable running too long, 3) Badly insulated / damaged cable | - **Workarounds**: Try to replace or shorten the VGA portion of the |
| * **Fix/Workaround**: Check projector for supported resolutions. Try to add an active, mediating device (e.g. Tronsmart, Dr. HDMI) in the cable pathway to the projector, ideally midways if you suspect cabling issues. | connection. Try an active HDMI-to-VGA adapter. The connectivity of the |
| | projector should be part of your location scouting checklist. \* |
| | - **Symptom**: HDMI-connected projector shows pixel noise in an |
| | otherwise clear picture |
| | - **Cause**: 1) Refresh rate / interlaced vs progressive. 2) Cable |
| | running too long, 3) Badly insulated / damaged cable |
| | - **Fix/Workaround**: Check projector for supported resolutions. Try to |
| | add an active, mediating device (e.g. Tronsmart, Dr. HDMI) in the |
| | cable pathway to the projector, ideally midways if you suspect cabling |
| | issues. |
| |
| ===== Software Issues ===== | ##### Software Issues |
| |
| ==== macOS ==== | #### macOS |
| * **Symptom**: HDMI-connected projector shows black and white pixel noise | |
| * **Symptom**: HDMI-connected projector shows green screen for a second, then gets disconnected. | |
| |
| ==== Windows ==== | - **Symptom**: HDMI-connected projector shows black and white pixel |
| | noise |
| | - **Symptom**: HDMI-connected projector shows green screen for a second, |
| | then gets disconnected. |
| |
| | #### Windows |
| |
| ==== Linux ==== | #### Linux |
| |
| ===== Issues to be Investigated ===== | ##### Issues to be Investigated |
| |
| When do Windows and OS X enable HDCP? What ways are there to make sure there are no HDCP issues during a presentation when no video content is shown? | When do Windows and OS X enable HDCP? What ways are there to make sure |
| | there are no HDCP issues during a presentation when no video content is |
| | shown? |
| | |
| | - <https://www.macworld.com/article/3042537/streaming-services/how-to-fix-hdcp-errors-with-external-monitors-in-os-x.html> |
| | - <https://www.macworld.com/article/3116414/macs/oops-you-cant-play-most-protected-digital-video-on-an-external-mac-monitor.html> |
| |
| * https://www.macworld.com/article/3042537/streaming-services/how-to-fix-hdcp-errors-with-external-monitors-in-os-x.html | |
| * https://www.macworld.com/article/3116414/macs/oops-you-cant-play-most-protected-digital-video-on-an-external-mac-monitor.html | |