Understanding frame rate and why original timing matters in video preservation.
What is frame rate?
Frame rate is the number of video frames represented or displayed per second.
Why does frame rate matter?
Changing frame rate can alter playback speed, motion characteristics or the relationship between picture and sound.
What is 25 fps?
25 frames per second is closely associated with PAL television and many European video workflows.
What is 29.97 fps?
29.97 frames per second is associated with NTSC-derived digital video standards and broadcast workflows.
Should frame rate be changed during preservation?
A preservation transfer should normally retain source timing rather than arbitrarily converting it for convenience.
Frequently Asked Questions
Is PAL always 25 fps?
PAL systems are strongly associated with 25-frame-per-second video, although recordings can have additional technical variations.
Can 25 fps video be converted to 30 fps?
It can, but that is a conversion rather than a neutral preservation step and should be undertaken for an identified access or production purpose.
Does frame rate affect file size?
Yes. All else being equal, more frames per second means more video data.
Further Reading
Oxford Duplication Centre — Practical Expertise
Professional video preservation depends on accurate source identification, compatible playback equipment, a controlled capture chain and careful quality assurance. Preservation, production and access outputs should be treated as separate purposes.
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