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Most Reolink cameras can stream and record in both H.264 and H.265 video compression forms. High Efficiency Video Coding (HEVC), which is another name for H.265, is known for being better at compressing video than H.264. This lets the video quality be better at lower bitrates, which is helpful when you have limited internet or storage space.

But the way you say a Reolink camera doesn't send out an H.265 stream when the resolution is low could be because of the camera's settings or limits. Here are a few possible reasons for this:

1. The software and settings: The firmware and options of the camera could affect how it works. Some cameras are made so that they can only use H.265 at higher resolutions. This is because H.265 works best with high-resolution images. Manufacturers might give H.265 high priority for high-quality streams to save space and bandwidth.

2. Processing Power: H.265 video encoding needs more processing power than H.264 video encoding. The H.265 codec might not be used for lower-resolution streams if the camera's processing power is not enough to handle the decoding process well.

3. It fits together: Some devices or software might handle H.264 better than H.265, especially if they are older or not optimised for newer video codecs. This could change how the camera works when streaming in poor quality.

4.Assigning Resources: Reolink cameras might be made to assign resources based on the quality chosen. If the camera sees a smaller resolution setting, it might choose the H.264 codec because it works with more devices and systems.

If you want to know for sure why a certain Reolink camera is acting this way, it's best to check the camera's user instructions or contact Reolink's customer support. They can tell you about the camera's design decisions and what it can't do.