Newbie Question Thread

[brispuss]

Trying to precompress a png image using xtool (2020 version) using the command -

xtool precomp -mpng+preflate -d1 Hint.png hint_png_preflate

and trying -

xtool precomp -mpng+reflate -d1 Hint.png hint_png_reflate

In both cases the outputs were only slightly larger than the original!?

For preflate option, 3642461 bytes to 3642579 bytes

and for reflate option, 3642461 bytes to 3642578 bytes.

Why only a slight increase in file sizes? Is there something I'm missing in the commands?

png image here

[brispuss]

As per the title, I'm trying to compress MP4 files, but I'm having difficulty in getting any compression of the files so far.

From searches here, it appears that SREP should be used first followed by LZMA for final compression. SREP settings as per posts at this forum could be -a2 -m5f -l512. Unknown what setting(s) used for the LZMA compression.

How to achieve best possible compression of MP4 files please?

Using SREP, LZMA, and/or other precompressors/compressors?

And what settings should be used (in general) for compressing MP4 files?

Process MP4 files via Freearc? 7zip? or what?

Thank you.

Sample MP4 video enclosed for testing.

Test Video

[Masquerade]

^^
Videos don't compress well, so just use srep. Anything more is wasting time.

The only video type that compresses only kind of well is bink videos (bik, bk2) because there is a specialised tool for it (bink_pack).

Other video formats, mp4, webm, avi etc etc etc all just use srep.