[FFmpeg-user] Compression is a lot smaller

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed Aug 19 21:05:24 EEST 2020

Am Sa., 15. Aug. 2020 um 13:01 Uhr schrieb Cecil Westerhof <Cecil at decebal.nl>:
> In the past the original file was between 4 to 13 times bigger as the
> compressed file.

As I tried to explain in the other thread:
Even neglecting the fact that you seem to believe your camera
does an uncompressed recording (it does not), size is by itself
no useful metric for any modern video codec (modern: Anything
since the early nineties). The oldest "modern" video codec (from
1991) can easily produce significantly smaller files.
Only if you take file size and quality together can you get a metric
that may make sense. Note that only subjective blind tests are
really meaningful, everything automated (like SSIM and PSNR)
does not measure what the human eye sees - but is probably
better than no quality metric at all.
A particular quality setting at encoding time does not give you a
particular comparable quality of the output file.

And just to repeat what was already written:
FFmpeg does not compress in your command line, x264 does
the compression.

Carl Eugen

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