Video Recording
The 5D Mark II was the first DSLR to feature 1080p video recording. The Canon PowerShot SX 1 IS followed with full HD in a bridge digital camera soon after. The 16:9 aspect ratio portion of the sensor used in video mode is similar in sensitive area to a VistaVision 8/35 frame. This large sensor allows videos to be recorded with very shallow depth of field for a "film look". The 21 megapixel sensor is downsampled to HD resolution by only using every third line and 4:2:0 chroma subsampling, leading to concern about Moiré patterns in recorded video.
Movie clips can be up to 4 GB in size, approximately 12 minutes of 16:9 HD (1920x1080) or 24 minutes of 4:3 SD (640x480) footage (depending on scene complexity). These limits stem from the 4 GB maximum file size supported by the FAT32 filesystem format used on Compact Flash cards. The camera also imposes a hard maximum clip length of 29 minutes 59 seconds if the 4 GB limit has not already been reached. Video clips are recorded as QuickTime MOV files with H.264/MPEG-4 (Base Profile @ L5) compressed video and uncompressed PCM audio at 48 kHz. HD bitrate is approximately 38 megabits per second (4.8 Mbyte/s) and SD bitrate is approximately 17 megabits per second (2.2 Mbyte/s). Although the internal microphone is mono, stereo audio is supported through the audio input jack. When recording for long periods, especially in warmer climates, increased video noise may occur due to CMOS overheating.
Read more about this topic: Canon EOS 5D Mark II
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