Please advise on best way to reduce video file sizes (.mov files)

mjw123

Active Member
Hi,

Just taken some footage of the kids on my Nikon D7000 but was rather concerned that 90secs at 720p was nearly 0.5Gb in size :eek:

Obviously this is soon going to fill my hard disk.

What is the best way to convert to a more more realistic size say around 75mb without sacrificing too much quality ?

Thanks in advance,
Mike.
 

grahamlthompson

In memoriam
There's only the following ways to reduce the size of a digital video file most of which won't be available to you in camera.

Use a more efficient compression algorithm

Reduce the bitrate used.

Use a smaller resolution.

Shoot at a lower framerate

Not really familiar with recording HD on DSLR so can only give general advice.

Assuming you want to stick with 720p 1280 x 720 at 50fps.

Look for a compression change option, just like stills for instance using jpeg over camera raw will produce smaller files. For video look for H264/AVC or Mpeg4 compression.

HD video uses a lot of memory.

Consider this.

If uncompressed


1280 x 720 at 50 fps needs to deliver 1280 x 720 x 50 x 60 pixels for one second of video. Each pixel will require at least 24 bits of colour information. (8 Red 8 Green 8 Blue).

So in 1 second we need 1280 x 720 x 50 x 60 x 24 bits.

Divide by 8 to get bytes/sec. Divide by 1000 to get approx Kilobytes/second of video. Multiply by 60 for 1 minute of video you will see the size of the problem :D
 

mjw123

Active Member
Thanks - what about converting the mov files afterward on the PC...is this a better option?
 

mjw123

Active Member
Any advice on what options to use in super to reduce the file size whilst keeping as much quality as possible ?

The source files will be .mov's
 

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