Re: [gentoo-user] NAS and replacing with larger drives

[David Rosenbaum]

Thanks

Dave

On Sat, Dec 10, 2022, 11:19 AM Frank Steinmetzger <Warp_7@×××.de> wrote:

> Am Sat, Dec 10, 2022 at 09:20:17AM +0000 schrieb Wols Lists:
>
> > > > Depending on the PVR make/model I've seen 1080p resolution
> recordings with
> > > > .m2ts and .ts file extensions, while the codecs inside them are the
> same.
> -------------------------------------^^^^^^^^^^^^^^^^^^^^^^^
> >
> > > I wasn’t aware that ts could contain h264. But then again—I never
> really
> ---------------------------------^^^^^^^
> > > bothered with live TV recordings in recent years.
>
> > I think this is confusing CONTAINER and CODEC.
>
> Where do we confuse those two? We specifically talked of codecs and
> “contain”.
>
> > .ts is a container format, h264 is a codec. I don't understand it myself,
> > either but think of ts as your directory structure and h264 as your file
> > structure.
>
> Now you are confusing me. You say you don’t understand it, but then explain
> it. TS is like AVI and MKV: a file structure for the payload data. And
> payload data can be all kinds of stuff, from ASS plaintext subtitles, over
> opus audio to mpeg2 or h264 video.
>
> > Incidentally, sticking this stuff in a .tar is probably okay - that's
> just
> > another container, but sticking it in a .tar.gz is not, the gz is your
> codec
> > and will make the file BIGGER in all probability.
>
> Tar does not compress, it simply puts all inputs in a 1:1 stream. It does
> add some metadata (filename and so on). Packers reduce data volume by
> increasing information-per-byte. So if the total information stays the same
> (for lossless coding), the number of bytes decreases. Encoded video data
> ideally has even entropy. It is indistinguishable from random noise. That’s
> why compressing it again does not yield anything, or even adds some volume
> again.
>
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