[FFmpeg-user] convert a video to some format and than bring it back exactly the same

[Julien Dotsev]

Thank you Moritz for your reply.
Have a nice day too.
Julian


On Thu, 29 Apr 2021, 11:46 Moritz Barsnick, <barsnick at gmx.net> wrote:

> Hi Julien,
>
> On Thu, Apr 29, 2021 at 04:17:20 +0200, Julien Dotsev wrote:
> > I see there is a difference in the file size. The first avi is *1462KB*
> and
> > after the reconversion is *1474KB*.
> >
> > My question is is there a way to take a video file from a client, convert
> > it to some readable by  HTML <video> tag format and after I finish using
> it
> > be able to bring to the client the original file, exactly the same.
>
> No, there is no such way. Every video operation with ffmpeg involves
> demuxing and muxing. And every muxer - so also ffmpeg's - has more or
> less subtle differences. ffmpeg may be less efficient (therefore the
> larger size), have other presents, and so on. Furthermore, your first
> operation may also lose metadata or data streams, which your second
> operation cannot recover.
>
> Cheers,
> Moritz
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