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Blu-ray export: 1080p @25 vs 720p @50
I create a lot of home video for Blu-ray burning. My newest footage is 1080p @ 50, but apparently this isn’t an option when exporting for Blu-ray, so I have to make some compromises. My options are 1080i @ “50” (2*25 fields), 720p @ 50 or 1080p @ 25. This is for PAL, the footage is AVCHD MTS.
Could someone chime in and let me know if the following logic is sound?
- I’m ruling out 1080i, as both this and 720p gives me half the spatial resolution, and with 720p I don’t have to deal with interlacing. The temporal resolution is basically the same.
- Since the AVCHD footage already is highly compressed, it’s better to sacrifice the spatial resolution and keep the temporal resolution.
- The Blu-ray player’s upscaling algorithm will mend the spatial compression to some degree and might even counteract some of the original AVCHD compression artifacts.
- Therefore I should choose 720p @ 50 over 1080p @ 25.
- Also: I should NOT start shooting the raw footage in 720p, but rather continue to downscale 1080p so in-camera artifacts from compression and low-light conditions are also downscaled in the process.
Am I wrong? What is your experience?
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1 Reply
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I agree you should use progressive rather than interlaced. The choice between 720p-50 or 1080p-25 will depend on the source footage. In the future, try maximizing quality to the greatest degree allowed by the camera (bitrate, GOP, lenses, aperture, lighting). I would probably focus on 1080p-25 first, and use 720p-50 for motion shots. It’s subjective, though.
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