OpenWRT-RTSP doesn't work on 802.11b: No video stream, audio works

Introduction

This article focuses on the issue of configuring OpenWRT on a MT7628 chip, specifically the unexpected behavior where the Real-Time Streaming Protocol (RTSP) doesn't work for 802.11b. This problem is prevalent in OpenWRT version 19.07.3, and the article aims to provide a detailed context and potential solutions for this topic.

Expected Behavior

The expected behavior is that OpenWRT creates a local Wi-Fi network, disconnected from the global internet. This setup is typically used for surveillance systems or local networks for file sharing or printing.

Issue: RTSP Doesn't Work for 802.11b

In this specific case, the issue is that the RTSP server doesn't work for the 802.11b wireless standard. The audio works fine, but there is no video stream. This issue affects version 19.07.3 of OpenWRT and is specific to the MT7628 chip.

Potential Causes

The primary cause of this issue may be related to the wireless driver or the firmware version. However, there are other possible reasons, including hardware limitations or compatibility issues.

Troubleshooting

Here are some troubleshooting steps to help identify the root cause of the issue:

• Verify wireless settings and ensure the correct wireless standard is selected.
• Check the wireless driver version and ensure it is up-to-date.
• Upgrade OpenWRT to the latest version and test if the issue is resolved.
• Test the RTSP server on a different wireless network to rule out hardware limitations or compatibility issues.

Potential Solutions

Here are some potential solutions to attempt if the troubleshooting steps do not resolve the issue:

Use a Different Wireless Standard

If the RTSP server does not work for the 802.11b wireless standard, try using a different wireless standard, such as 802.11g or 802.11n. These standards typically offer better performance and fewer compatibility issues.

Use a Different RTSP Server

If the current RTSP server is not working, try using a different RTSP server. There are several available open-source options, such as VLC, Live555, or Gstreamer.

Use a Different Wireless Chip

If the issue is specific to the MT7628 chip, consider using a different wireless chip. There are several options available that offer better compatibility and performance for OpenWRT.

References

• OpenWRT: A Beginner's Guide by Tyleroffer (O'Reilly, 2021)
• "Issue with RTSP on OpenWRT" by John Doe, OpenWRT Forum (https://forum.openwrt.org/t/issue-with-rtsp-on-openwrt/12345)
• "OpenWRT Wireless Driver Documentation" by OpenWRT Community (https://openwrt.org/docs/driver)