The Canon 7D’s all-new CMOS sensor records high definition video at a maximum resolution of 1,920 x 1,080 pixels with a 16:9 aspect ratio — what’s sometimes referred to as “Full HD”, or 1080i/1080p. Both NTSC modes of 23.976 or 29.97 frames/second and PAL modes of 23.976 or 25 frames/second are available at full resolution. The full resolution can be downsampled in-camera to produce 1,280 x 720 (720p) resolution movies, with the NTSC mode using 59.94 frames/second, and the PAL mode offering 50 frames/second. Finally, a standard definition 4:3 aspect ratio mode captures 640×480 pixel (VGA) movies, again with 59.94 frames/second in NTSC or 50 frames/second in PAL. The numerous different frame rates match various broadcast television formats etc., removing the need to transcode to the intended output frame rate after capture.
Individual movie clips captured by the Canon EOS 7D are limited to a maximum of twelve minutes in the high definition 1080p and 720p modes, or 24 minutes in the standard definition VGA mode. (Canon didn’t give a reason for this, but perhaps it’s a matter of power consumption and sensor heating: We noticed that the body can get rather warm after an extended period of video shooting.) The Canon 7D records its movies as MOV files using AVC / H.264 compression, which is much more conservative of memory card space than the Motion JPEG format used by some cameras, and avoids some of the severe image quality loss suffered by AVCHD cameras when faced with significant amounts of change in image content between frames. (AVCHD uses a subset of the H.264 standard, among other things mandating a limit in recording bandwidth, which translates into a lesser ability to convey rapidly-changing detail.) The choice of H.264 comes with the requirement of greater processing power, though — not only from the camera when recording, but also when playing back or editing videos. The more sophisticated encoding used in the H.264 standard requires quite a bit of processor power to pull it apart and put it back together again, so frame-accurate editing of H.264 requires a fast processor and capable editing program.
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Added on : April 11th, 2019
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