[FFmpeg-user] Question about file size changes
dmngaie at gmail.com
Mon Jun 17 01:35:12 EEST 2019
On Sun, 16 Jun 2019 at 22:26, David Shuman <d.shuman at att.net> wrote:
> I have a video recorder that outputs files with an .mts suffix. mediainfo
> identifies these files as BDAV more commonly .m2ts files I attempt to copy
> these files with the following commands
> ffmpeg -i
> "D:\Dave\Videos\010-raw\mts\Charge-05082019-2255.mts" -c
> "D:\Dave\Videos\020-fix\mts\Charge-05082019-2255.mts" 2>&1
> | wtee "D:\Dave\Videos\log\mts\ffFIX-Charge-05082019-2255.txt"
> I renamed the file to have a .m2ts suffix and tried again
> ffmpeg -i
> "D:\Dave\Videos\010-raw\m2ts\Charge-05082019-2255.m2ts" -c
> 2>&1 | wtee "D:\Dave\Videos\log\m2ts\ffFIX-Charge-05082019-2255.txt"
> The resulting output files according to mediainfo have had their video bit
> rates increased The original is 1778 kb/s regardless of file suffix,
> the .mts copy is 1817 kb/s and the .m2ts copy is 1870 kb/s.
> Why do the copies have higher video bit rates? Nothing else significant
> appears to have changed the .mts claims format is mpeg-ts on the output,
> all other formats both input and the .m2ts output claim to be BDAV.
> Is there a way I can keep the bit rate the same so the copy matches the
> original except for corrections made during the copy for missing franes,
Most likely you're seeing the effects of muxer overheads.
>From your console: muxing overhead: 9.707805%
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