[gentoo-user] Re: OT: Avi-player diplaying the current frame counter while playing ?

[Kai Krakow]

Am Fri, 26 May 2017 00:11:41 +0200
schrieb wabe :

> tu...@posteo.de wrote:
> 
> > Hi,
> > 
> > currentlu I am playing around with Blender animations.
> > 
> > To sync certain movements of objects to other objects
> > I need the exact frame number, at which "something
> > happens" ;)
> > 
> > The clips are of the avi-format but they are of non
> > standard resultions. MPlayer does not play them
> > ("no audio found" and that's it) but mpv has no
> > problem with them.
> > But mpv only prints the perceantage of how much
> > is played already (I cant convice mpv otherwise...)
> > 
> > Is there a way to instruct mpv to print the current
> > frame count while playing?
> > Are there other players known to do that?  
> 
> Check out cinelerra. It is a non-linear video editor and so it also 
> plays videos and shows the exact timestamp or framenumber (you can 
> set this in preferences). But cinelerra is a very complex software 
> and thus maybe not what you are looking for. 
> 
> Avidemux can also be used as a video player but IIRC it can't show
> framenumbers but only the exact timestamp.

Kdenlive may be an option, too.


-- 
Regards,
Kai

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[gentoo-user] Re: Puzzled by zswap [Was: tmp on tmpfs]

[Kai Krakow]

Am Thu, 25 May 2017 11:46:45 -0700
schrieb Ian Zimmerman :

> On 2017-05-24 19:05, Kai Krakow wrote:
> 
> > To get in line with Rich Freeman: I didn't want to imply that zswap
> > only works with swap, neither that tmpfs only works with swap. Both
> > work without. But if you want to put some serious amount of data
> > into tmpfs, you need swap as a backing device sooner or later.  
> 
> Looking at zswap, I have several questions
> (even after reading linux/Documentation/vm/zswap.txt).
> 
> 1.  How does it know which swap device to use as backing store, if
> any? Clearly at boot time no swap configuration exists, even if
> initrd/initramfs is used, which here it is not.  So when the kernel
> sees zswap.enable=1 in the command line, what happens?

You simply don't assign a swap device to zswap. It's transparently
inserted into the swapping chain of the kernel. Thus pages are first
compressed, and later swapped out by normal kernel processing.

> 2.  The doc says it can be turned on at runtime by means of
> /sys/module/zswap/parameters/enabled.  But kconfig doesn't make it
> possible to build the support as a module, only built-in, and so it is
> not surprising that this path doesn't exist.

I wonder why this doesn't exist. All my builtin modules have their
parameters in /sys/module:

# lsmod | fgrep zswap | wc -l
0
# ls -ald /sys/module/zswap
drwxr-xr-x 3 root root 0 26. Mai 07:54 /sys/module/zswap

> 3.  It seems to require zbud to also be turned on, but this is not
> enforced by kconfig.  Is this a bug or what?

No idea, I enabled it...

> 4.  Quoting:
> 
>  Zswap seeks to be simple in its policies.  Sysfs attributes allow
> for one user controlled policy:
>  * max_pool_percent - The maximum percentage of memory that the
> compressed pool can occupy.
> 
> Does this mean this is another (hypothetical) node in
> /sys/module/zswap/parameters/ ?

grep ^ /sys/module/zswap/parameters/*
/sys/module/zswap/parameters/compressor:lzo
/sys/module/zswap/parameters/enabled:Y
/sys/module/zswap/parameters/max_pool_percent:20
/sys/module/zswap/parameters/zpool:zbud 

This also implies that zbud it required for zswap to even operate. If
you didn't include it, it may be the reason why zswap is missing
in /sys/module.


-- 
Regards,
Kai

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