[FFmpeg-user] Question about file size changes
d.shuman at att.net
Wed Jun 19 03:54:27 EEST 2019
In terms of which conversion is more valid which play quality would be closer to the original -- does the m2ts change less of the content when remixing than the mts as BDAV does not change to mpeg-ts our would one consider the additional headers from m2ts to more of a quality change so mts provides a file more like the original again in terms of play quality?
On Tuesday, June 18, 2019, 1:11:21 PM EDT, Moritz Barsnick <barsnick at gmx.net> wrote:
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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