Syncing Two h.265 Clips in DaVinci Resolve, 3 Methods

This is a comparison of syncing two h.265 clips in DaVinci Resolve using 3 different methods: 0:00:00 uses Resolve's Clip: Auto Align Clips: Timecode method, using the time codes embedded in the h.265 stream. As you can see, the result is not very good, and the two clips are mis-aligned by 41 frames, or more than 2 seconds at 20 fps. 0:00:25 uses Resolve's Clip: Auto Align Clips: Waveform method, attempting to sync up the audio waveforms. It's better, but still off by a couple of frames. 0:00:50 is the result of manual nudging of the clips, frame-by-frame, until the burned-in timestamps flip over from one second to the next, exactly. This is the best one can do, and some misalignment is still visible in the resulting video due to 1) physical misalignment of the two cameras, which cannot possibly be located in the same spot, and 2) inherent asynchronicity between the two cameras, because they generate their own internal clocks. This most closely matches what I see on the cameras in real-time. ​Since the h.265 timestamps appear to be useless, I'm going to set the cameras back to h.264. The cameras are identical Amcrest IP5M-T1179EW-AI-V3 units, both syncing to my internal NTP server on my pfsense router. Video is recorded 24/7, direct-to-disk onto my Blue Iris PC and exported without re-encoding.