[Cin] Patches again - filepng, opencv config
Andrew Randrianasulu
randrianasulu at gmail.com
Fri Mar 27 22:39:28 CET 2020
В сообщении от Saturday 28 March 2020 00:11:13 Phyllis Smith написал(а):
> Well, gg looked every where he could think of to obviously include libpng
> and could find absolutely no place where the "endian"ness was stored.
> Still confused here.
May be it really not stored, but ASSUMED?
>
> On Fri, Mar 27, 2020 at 2:24 PM Andrew Randrianasulu <
> randrianasulu at gmail.com> wrote:
>
> > В сообщении от Friday 27 March 2020 22:38:29 Phyllis Smith написал(а):
> > > Andrew,
> > > We have not given up on this yet but really do not understand the png
> > > little endian issue. When gg looks through the png code it is very
> > > insistent that with the meaning of png being Portable *Network* Graphics.
> > > The emphasis on Network does not allow for little endian.
> > > ------------------------------
> > > ./libpng.3:the Portable Network Graphics (PNG) format image files. It
> > uses
> > > the
> > > ./libpng.3:PNG files store 16-bit pixels in network byte order
> > (big-endian,
> > > ./libpng.3:PNG files store 16-bit pixels in network byte order
> > (big-endian,
> > > ./libpng-manual.txt:PNG files store 16-bit pixels in network byte order
> > > (big-endian,
> > > -----------------------------
> > > Sorry for our confusion; I hope we can get this figured out but all
> > > indications on our computers and in the code is only Big endian.
> >
> > But my machine is LE! * And libPNG doesn't do this swap by default ONLY
> > for
> > those newly-introduced 16 bit per color channel format, at least in my
> > tests!
> >
> > Did you tried to look at Cin PNG output in both cases?
> > (8 bpc default, 16 - when you select it)
> >
> > *Actually, I wish to test on qemu-system-ppc, but this take a lot of time
> > - because emulated Mac is only single-core ..... and full emulation
> > easily can slow down your Instructions per second 10x down!
> >
> > So, it will be 4x slower by being single core, and 10x at least slower
> > again due to system emulation (kvm can't help here).. so, 1 hour
> > will become 40!
> >
> > >
> > > On Thu, Mar 26, 2020 at 8:46 PM Andrew Randrianasulu <
> > > randrianasulu at gmail.com> wrote:
> > >
> > > > Sorry for insisting on this filepng part - but it was my work,
> > > > and I dislike to ship broken feature!
> > > >
> > > > I actually tested Cinelerra git on Ubuntu Live DVD, and
> > > > _16 bit_ pngs were broken there without it.
> > > >
> > > > It was as simple as
> > > > 1) opening the video
> > > > 2) setting project to rgba-float color format.
> > > > 3) trying to save png (from non-black area of timeline)
> > > > and set options to "with alpha, 16 bits".
> > > >
> > > > By default Cin adds encoded results into resources and on new tracks -
> > > > you clearly can see it will be black/broken. 8-bits PNGs are OK.
> > > >
> > > > Ubuntu image I used:
> > > > http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/
> > > > xubuntu-18.04.4-desktop-amd64.iso
> > > > <
> > http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso
> > >
> > > > - 1.4 Gb
> > > >
> > > > Then I created 4 Gb file in tmpfs, formatted it with btrfs with
> > > > compression, and booted Live image:
> > > >
> > > > guest at slax:/dev/shm$ wget
> > > >
> > http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso
> > > > --2020-03-25
> > > > <
> > http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso--2020-03-25
> > >
> > > > 13:55:42--
> > > >
> > http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso
> > > > Распознаётся mirror.yandex.ru… 213.180.204.183, 2a02:6b8::183
> > > > Подключение к mirror.yandex.ru|213.180.204.183|:80... соединение
> > > > установлено.
> > > > HTTP-запрос отправлен. Ожидание ответа… 200 OK
> > > > Длина: 1534459904 (1,4G) [application/octet-stream]
> > > > Сохранение в: «xubuntu-18.04.4-desktop-amd64.iso»
> > > >
> > > > xubuntu-18.04.4-desktop-amd64.iso
> > > >
> > 100%[==============================================================================================================>]
> > > > 1,43G 8,26MB/s за 6m 40s
> > > >
> > > > 2020-03-25 14:02:28 (3,66 MB/s) - «xubuntu-18.04.4-desktop-amd64.iso»
> > > > сохранён [1534459904/1534459904]
> > > >
> > > > guest at slax:/dev/shm$ qemu-sy
> > > > qemu-system-aarch64 qemu-system-i386 qemu-system-mips
> > > > qemu-system-nios2 qemu-system-riscv64
> > > > qemu-system-sparc64 qemu-system-xtensaeb
> > > > qemu-system-alpha qemu-system-lm32 qemu-system-mips64
> > > > qemu-system-or1k qemu-system-s390x
> > qemu-system-tricore
> > > > qemu-system-arm qemu-system-m68k
> > qemu-system-mips64el
> > > > qemu-system-ppc qemu-system-sh4
> > > > qemu-system-unicore32
> > > > qemu-system-cris qemu-system-microblaze qemu-system-mipsel
> > > > qemu-system-ppc64 qemu-system-sh4eb
> > qemu-system-x86_64
> > > > qemu-system-hppa qemu-system-microblazeel qemu-system-moxie
> > > > qemu-system-riscv32 qemu-system-sparc
> > qemu-system-xtensa
> > > > guest at slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso
> > > > qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot
> > allocate
> > > > memory
> > > > guest at slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso
> > > > guest at slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso
> > -enable-kvm
> > > > -smp 3
> > > > guest at slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso
> > -enable-kvm
> > > > -smp 3
> > > > guest at slax:/dev/shm$ dd if=/dev/zero of=4Gb bs=1k count=4M
> > > > 4194304+0 записей получено
> > > > 4194304+0 записей отправлено
> > > > 4294967296 байт (4,3 GB, 4,0 GiB) скопирован, 20,7155 s, 207 MB/s
> > > > guest at slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso
> > -enable-kvm
> > > > -smp 4 -hda 4Gb
> > > > WARNING: Image format was not specified for '4Gb' and probing guessed
> > raw.
> > > > Automatically detecting the format is dangerous for raw
> > images,
> > > > write operations on block 0 will be restricted.
> > > > Specify the 'raw' format explicitly to remove the
> > restrictions.
> > > >
> > > > in just a hour I had compiled Cinelerra (by copying git tree from host
> > > > BEFORE launching qemu)
> > > >
> > > > Note, in such mem-restricted VM you want to use zram (not default in
> > this
> > > > ubuntu flavor):
> > > > as root
> > > > modprobe zram
> > > > echo 1000000000 > /sys/block/zram0/disksize
> > > > mkswap /dev/zram0
> > > > swapon /dev/zram0
> > > >
> > > > this will create 1Gb sized compressed swap in ram
> > > >
> > > > I even send email from this virtual setup, but it apparently was stuck
> > in
> > > > moderation
> > > > due to size (over 750 kb).
> > > >
> > > > NOW, I found something really weird!
> > > > Patch as attached worked on 64-bit Ubuntu,
> > > > but for my system I *must*
> > > > place this call to png_set_swap(png_ptr); differently, not before
> > > > png_write_info(png_ptr, info_ptr);
> > > > but AFTER! I actually left both there ....
> > > >
> > > > Still, this is something strange, I'll try to contact libpng author
> > about
> > > > this.....
> > > >
> > > > Also, I attach my current OpenCV tweaks - trim out unneeded stuff,
> > > > fixing two typos, adding -stdc++11 line for my odd system.
> > > >
> > > > I still use opencv-20180401.tgz
> > > >
> > > > I also have two lame (mp3lame) patches, but will send them separately.
> > > > --
> > > > Cin mailing list
> > > > Cin at lists.cinelerra-gg.org
> > > > https://lists.cinelerra-gg.org/mailman/listinfo/cin
> > > >
> > >
> >
> >
> > --
> > Cin mailing list
> > Cin at lists.cinelerra-gg.org
> > https://lists.cinelerra-gg.org/mailman/listinfo/cin
> >
>
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