The new Canon 5D Mark III comes with two compression options when recording video at 1920 x 1080 and 30 fps. They are IPB and ALL-I. The latter compression actually increases the file size by about 35% to 65%, depending on the ISO you use. The higher the ISO, the more storage savings you get by shooting with IPB instead of ALL-I compression.
Since the storage savings can be enormous, it begs the obvious question of whether IPB noticeably degrades the quality of the recording or not. See for yourself!
Videos from both cameras were acquired using the exact same settings:
- 1920 x 1080
- 30 fps
I used the Canon EF 50mm f/1.4 USM lens. Any in-camera sharpening and noise reduction was disabled. There was no post-processing done to any of the videos.
The white balance was set at auto, and the white balance was not off; the wall was orange, not white.
The ISOs tested are 100, 200, 400, 800, 1600, 3200, 6400, 10000, 12800, 16000, 20000, and 25600.
Please note, the higher-compression IPB is on the left, and the highest quality ALL-I is on the right.
Until ISO 1600, there is no discernable noise in the videos. At ISO 1600 and above, the ALL-I compressions seems to have slightly lower noise. Whether that’s significant or not is really a judgement call and probably depends on the type of video being shot. Both compression methods seem pretty good though.
ISO 1600 seems to be the cutoff, where you first start noticing a discernable difference in noise between the two compression schemes. ALL-I seems to perform ever so slightly better at higher ISOs, but is that slight benefit really worth it?
I leave you to decide what you think of these compressions schemes. Honestly, I feel like you can easily use the IPB compression for most videos and save a lot on buying larger memory cards and storage space. We appreciate your comments on this video and suggestions for future ones!
Until next time!