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WHAT NOT TO compress

Subject	Author
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Paul
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Bit Twister
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	Paul
[OT] really delusional compression ratio => WHAT NOT TO compress	Jim Diamond
[OT] really delusional compression ratio => WHAT NOT TO compress	Jim Diamond
[OT] really delusional compression ratio => WHAT NOT TO compress	Paul
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Jim Diamond
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Jim Diamond
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Joerg Lorenz
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Joerg Lorenz
[OT] really delusional compression ratio => WHAT NOT TO compress	Joerg Lorenz
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Joerg Lorenz
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	Joerg Lorenz
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	David W. Hodgins
[OT] really delusional compression ratio => WHAT NOT TO compress	Joerg Lorenz
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E. R.
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Dan Purgert
[OT] really delusional compression ratio => WHAT NOT TO compress	Jasen Betts
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	Jim Diamond
[OT] really delusional compression ratio => WHAT NOT TO compress	Jasen Betts
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Jim Diamond
[OT] really delusional compression ratio => WHAT NOT TO compress	Jasen Betts
[OT] really delusional compression ratio => WHAT NOT TO compress	Paul
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Paul
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E. R.
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E. R.
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	Carlos E.R.
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP
[OT] really delusional compression ratio => WHAT NOT TO compress	MarioCPPP

Pages:1 23

Re: [OT] really delusional compression ratio => WHAT NOT TO compress

<u6jqeg$a1i$1@gonzo.revmaps.no-ip.org>

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From: usenet@revmaps.no-ip.org (Jasen Betts)
Newsgroups: alt.os.linux
Subject: Re: [OT] really delusional compression ratio => WHAT NOT TO compress
Organization: JJ's own news server
Message-ID: <u6jqeg$a1i$1@gonzo.revmaps.no-ip.org>
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by: Jasen Betts - Sat, 17 Jun 2023 08:21 UTC

On 2023-06-16, Jim Diamond <JimDiamond@jdvb.ca> wrote:
> On 2023-06-13 at 07:28 ADT, Carlos E.R. <robin_listas@es.invalid> wrote:
>> On 2023-06-13 12:13, MarioCPPP wrote:
>>> On 12/06/23 20:43, Jim Diamond wrote:
>>>> On 2023-06-12 at 06:37 ADT, Dan Purgert <dan@djph.net> wrote:
>>>>> On 2023-06-11, Jim Diamond wrote:
>>
>> ...
>>
>>> my current list of DONT-COMPRESS includes :
>>>
>>> .fsa .squashfs .squash .lzw .lz77 .ppm .mp3 .aac .ogg .ogx .vorbis .gif
>>> .png .jpeg .jpg .webp .heif .mpeg .mpg .mp4 .m4v .hevc .webm .mkv .mk3d
>>> .avi .wmv .asf .DivX .mkv .mov .qt .FLV .F4V .SWF .m2p .mp2t .ps .ts
>>> .tsv .m2ts .mts .vob .evo .3gp .jhr .jr .jz .jahr .apk .msi .deb
>>> 0
>>> I am unsure about the .deb and about Java compressed packages
>>
>> A good compressor should know all those and automatically not waste cpu
>> cycles on them.
>
> Do you know of any compressor that checks the file types (not the
> extension, which could be bogus) and refuses to try compressing?

type is not indicative. eg: GIFs produced by libungif can be
compressed.

--
Jasen.
🇺🇦 Слава Україні

Re: [OT] really delusional compression ratio => WHAT NOT TO compress

<u6k10n$16tku$1@dont-email.me>

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From: NoliMihiFrangereMentulam@libero.it (MarioCPPP)
Newsgroups: alt.os.linux
Subject: Re: [OT] really delusional compression ratio => WHAT NOT TO compress
Date: Sat, 17 Jun 2023 12:13:43 +0200
Organization: A noiseless patient Spider
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by: MarioCPPP - Sat, 17 Jun 2023 10:13 UTC

On 17/06/23 10:21, Jasen Betts wrote:
> On 2023-06-16, Jim Diamond <JimDiamond@jdvb.ca> wrote:
>> On 2023-06-13 at 07:28 ADT, Carlos E.R. <robin_listas@es.invalid> wrote:
>>> On 2023-06-13 12:13, MarioCPPP wrote:
>>>> On 12/06/23 20:43, Jim Diamond wrote:
>>>>> On 2023-06-12 at 06:37 ADT, Dan Purgert <dan@djph.net> wrote:
>>>>>> On 2023-06-11, Jim Diamond wrote:
>>>
>>> ...
>>>
>>>> my current list of DONT-COMPRESS includes :
>>>>
>>>> .fsa .squashfs .squash .lzw .lz77 .ppm .mp3 .aac .ogg .ogx .vorbis .gif
>>>> .png .jpeg .jpg .webp .heif .mpeg .mpg .mp4 .m4v .hevc .webm .mkv .mk3d
>>>> .avi .wmv .asf .DivX .mkv .mov .qt .FLV .F4V .SWF .m2p .mp2t .ps .ts
>>>> .tsv .m2ts .mts .vob .evo .3gp .jhr .jr .jz .jahr .apk .msi .deb
>>>> 0
>>>> I am unsure about the .deb and about Java compressed packages
>>>
>>> A good compressor should know all those and automatically not waste cpu
>>> cycles on them.
>>
>> Do you know of any compressor that checks the file types (not the
>> extension, which could be bogus) and refuses to try compressing?
>
> type is not indicative. eg: GIFs produced by libungif can be
> compressed.
>

sure, that's understood ... but extention can be a
reasonably "cut-off" when dealing with literally millions of
files.

pre-compressed whole disk-image formats, on the other hand,
would be usefully be recognized, as they are LARGE files.

There my list is very rough (I did not add .vdi since they
happen to be not compressed, but maybe some options to use
compressed ones exist, never inquired). .vhd or other (.cow
?) I know even less, not using them.

--
1) Resistere, resistere, resistere.
2) Se tutti pagano le tasse, le tasse le pagano tutti
MarioCPPP

Re: [OT] really delusional compression ratio => WHAT NOT TO compress

<slrnu8rkme.ccj.JimDiamond@x360.localdomain>

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From: JimDiamond@jdvb.ca (Jim Diamond)
Newsgroups: alt.os.linux
Subject: Re: [OT] really delusional compression ratio => WHAT NOT TO compress
Date: Sat, 17 Jun 2023 12:35:42 -0300
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by: Jim Diamond - Sat, 17 Jun 2023 15:35 UTC

On 2023-06-17 at 05:21 ADT, Jasen Betts <usenet@revmaps.no-ip.org> wrote:
> On 2023-06-16, Jim Diamond <JimDiamond@jdvb.ca> wrote:
>> On 2023-06-13 at 07:28 ADT, Carlos E.R. <robin_listas@es.invalid> wrote:
>>> On 2023-06-13 12:13, MarioCPPP wrote:
>>>> On 12/06/23 20:43, Jim Diamond wrote:
>>>>> On 2023-06-12 at 06:37 ADT, Dan Purgert <dan@djph.net> wrote:
>>>>>> On 2023-06-11, Jim Diamond wrote:

>>> ...

>>>> my current list of DONT-COMPRESS includes :

>>>> .fsa .squashfs .squash .lzw .lz77 .ppm .mp3 .aac .ogg .ogx .vorbis .gif
>>>> .png .jpeg .jpg .webp .heif .mpeg .mpg .mp4 .m4v .hevc .webm .mkv .mk3d
>>>> .avi .wmv .asf .DivX .mkv .mov .qt .FLV .F4V .SWF .m2p .mp2t .ps .ts
>>>> .tsv .m2ts .mts .vob .evo .3gp .jhr .jr .jz .jahr .apk .msi .deb
>>>> 0
>>>> I am unsure about the .deb and about Java compressed packages

>>> A good compressor should know all those and automatically not waste cpu
>>> cycles on them.

>> Do you know of any compressor that checks the file types (not the
>> extension, which could be bogus) and refuses to try compressing?

> type is not indicative. eg: GIFs produced by libungif can be
> compressed.

Which doesn't answer my question to Carlos, but ...

I am by no means an expert on GIFs, but everything I've read indicates they
are compressed with LZW. Are you saying that libungif can actually create
a (compliant) GIF89 file which is not internally compressed?

Cheers.
Jim

Re: [OT] really delusional compression ratio => WHAT NOT TO compress

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From: usenet@revmaps.no-ip.org (Jasen Betts)
Newsgroups: alt.os.linux
Subject: Re: [OT] really delusional compression ratio => WHAT NOT TO compress
Organization: JJ's own news server
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by: Jasen Betts - Sun, 18 Jun 2023 07:18 UTC

On 2023-06-17, Jim Diamond <JimDiamond@jdvb.ca> wrote:
> On 2023-06-17 at 05:21 ADT, Jasen Betts <usenet@revmaps.no-ip.org> wrote:
>> On 2023-06-16, Jim Diamond <JimDiamond@jdvb.ca> wrote:
>>> On 2023-06-13 at 07:28 ADT, Carlos E.R. <robin_listas@es.invalid> wrote:
>>>> On 2023-06-13 12:13, MarioCPPP wrote:
>>>>> On 12/06/23 20:43, Jim Diamond wrote:
>>>>>> On 2023-06-12 at 06:37 ADT, Dan Purgert <dan@djph.net> wrote:
>>>>>>> On 2023-06-11, Jim Diamond wrote:
>
>>>> ...
>
>>>>> my current list of DONT-COMPRESS includes :
>
>>>>> .fsa .squashfs .squash .lzw .lz77 .ppm .mp3 .aac .ogg .ogx .vorbis .gif
>>>>> .png .jpeg .jpg .webp .heif .mpeg .mpg .mp4 .m4v .hevc .webm .mkv .mk3d
>>>>> .avi .wmv .asf .DivX .mkv .mov .qt .FLV .F4V .SWF .m2p .mp2t .ps .ts
>>>>> .tsv .m2ts .mts .vob .evo .3gp .jhr .jr .jz .jahr .apk .msi .deb
>>>>> 0
>>>>> I am unsure about the .deb and about Java compressed packages
>
>>>> A good compressor should know all those and automatically not waste cpu
>>>> cycles on them.
>
>>> Do you know of any compressor that checks the file types (not the
>>> extension, which could be bogus) and refuses to try compressing?
>
>> type is not indicative. eg: GIFs produced by libungif can be
>> compressed.
>
> Which doesn't answer my question to Carlos, but ...
>
> I am by no means an expert on GIFs, but everything I've read indicates they
> are compressed with LZW. Are you saying that libungif can actually create
> a (compliant) GIF89 file which is not internally compressed?
>
> Cheers.
> Jim

libungif did RLE compresion in a way that can be unpacked by an LZW decoder.

--
Jasen.
🇺🇦 Слава Україні

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