[FFmpeg-user] Question about file size changes
barsnick at gmx.net
Tue Jun 18 20:11:10 EEST 2019
On Tue, Jun 18, 2019 at 16:31:45 +0200, Jerome Martinez wrote:
> On 18/06/2019 15:01, Moritz Barsnick wrote:
> > I don't know why mediainfo determines different video bit rates (1817 vs.
> As it is not possible to compute the bitrate per stream in MTS/M2TS
> without parsing the whole file, MediaInfo does an estimation, and in
> this case the estimation is unfortunately different depending on the
> container used.
That's what I thought. I believe it's no different for ffmpeg, which
does warn regarding duration estimation for some codecs (notably MP3),
but otherwise does not indicate whether a displayed bitrate is from
metadata or from knowledge or from estimation. (I may be wrong here,
too lazy to check.)
> (I plan to add "estimated" later when relevant so more explicit that
> it could be different for the same stream, but more complex in the
As to not confuse people, that's probably better. But multimedia coding
is so complex anyway, it tends to confuse people. ;-)
> (the question about the overall bitrate and file size change will
> stay though, due to the good reasons you provided).
Yes, it wasn't 100 % clear from the original posting what the complaint
> Jérôme, developer of MediaInfo.
Thanks for pitching in,
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