<div dir="ltr"><div class="gmail_default" style="font-size:small"><span class="gmail-ILfuVd"><span class="e24Kjd">Andrew,</span></span></div><div class="gmail_default" style="font-size:small"><span class="gmail-ILfuVd"><span class="e24Kjd">We thought of another png experiment that we are going to try tomorrow.</span></span></div><div class="gmail_default" style="font-size:small"><span class="gmail-ILfuVd"><span class="e24Kjd">Both our laptop and desktop are AMD and thus are necessarily <b>little</b>-<b>endian</b>.</span></span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Mar 27, 2020 at 3:51 PM Andrew Randrianasulu <<a href="mailto:randrianasulu@gmail.com">randrianasulu@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">В сообщении от Saturday 28 March 2020 00:11:13 Phyllis Smith написал(а):<br>
> Well, gg looked every where he could think of to obviously include libpng<br>
> and could find absolutely no place where the "endian"ness was stored.<br>
> Still confused here.<br>
<br>
May be it really not stored, but ASSUMED?<br>
<br>
> <br>
> On Fri, Mar 27, 2020 at 2:24 PM Andrew Randrianasulu <<br>
> <a href="mailto:randrianasulu@gmail.com" target="_blank">randrianasulu@gmail.com</a>> wrote:<br>
> <br>
> > В сообщении от Friday 27 March 2020 22:38:29 Phyllis Smith написал(а):<br>
> > > Andrew,<br>
> > > We have not given up on this yet but really do not understand the png<br>
> > > little endian issue. When gg looks through the png code it is very<br>
> > > insistent that with the meaning of png being Portable *Network* Graphics.<br>
> > > The emphasis on Network does not allow for little endian.<br>
> > > ------------------------------<br>
> > > ./libpng.3:the Portable Network Graphics (PNG) format image files. It<br>
> > uses<br>
> > > the<br>
> > > ./libpng.3:PNG files store 16-bit pixels in network byte order<br>
> > (big-endian,<br>
> > > ./libpng.3:PNG files store 16-bit pixels in network byte order<br>
> > (big-endian,<br>
> > > ./libpng-manual.txt:PNG files store 16-bit pixels in network byte order<br>
> > > (big-endian,<br>
> > > -----------------------------<br>
> > > Sorry for our confusion; I hope we can get this figured out but all<br>
> > > indications on our computers and in the code is only Big endian.<br>
> ><br>
> > But my machine is LE! * And libPNG doesn't do this swap by default ONLY<br>
> > for<br>
> > those newly-introduced 16 bit per color channel format, at least in my<br>
> > tests!<br>
> ><br>
> > Did you tried to look at Cin PNG output in both cases?<br>
> > (8 bpc default, 16 - when you select it)<br>
> ><br>
> > *Actually, I wish to test on qemu-system-ppc, but this take a lot of time<br>
> > - because emulated Mac is only single-core ..... and full emulation<br>
> > easily can slow down your Instructions per second 10x down!<br>
> ><br>
> > So, it will be 4x slower by being single core, and 10x at least slower<br>
> > again due to system emulation (kvm can't help here).. so, 1 hour<br>
> > will become 40!<br>
> ><br>
> > ><br>
> > > On Thu, Mar 26, 2020 at 8:46 PM Andrew Randrianasulu <<br>
> > > <a href="mailto:randrianasulu@gmail.com" target="_blank">randrianasulu@gmail.com</a>> wrote:<br>
> > ><br>
> > > > Sorry for insisting on this filepng part - but it was my work,<br>
> > > > and I dislike to ship broken feature!<br>
> > > ><br>
> > > > I actually tested Cinelerra git on Ubuntu Live DVD, and<br>
> > > > _16 bit_ pngs were broken there without it.<br>
> > > ><br>
> > > > It was as simple as<br>
> > > > 1) opening the video<br>
> > > > 2) setting project to rgba-float color format.<br>
> > > > 3) trying to save png (from non-black area of timeline)<br>
> > > > and set options to "with alpha, 16 bits".<br>
> > > ><br>
> > > > By default Cin adds encoded results into resources and on new tracks -<br>
> > > > you clearly can see it will be black/broken. 8-bits PNGs are OK.<br>
> > > ><br>
> > > > Ubuntu image I used:<br>
> > > > <a href="http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/" rel="noreferrer" target="_blank">http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/</a><br>
> > > > xubuntu-18.04.4-desktop-amd64.iso<br>
> > > > <<br>
> > <a href="http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso" rel="noreferrer" target="_blank">http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso</a><br>
> > ><br>
> > > > - 1.4 Gb<br>
> > > ><br>
> > > > Then I created 4 Gb file in tmpfs, formatted it with btrfs with<br>
> > > > compression, and booted Live image:<br>
> > > ><br>
> > > > guest@slax:/dev/shm$ wget<br>
> > > ><br>
> > <a href="http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso" rel="noreferrer" target="_blank">http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso</a><br>
> > > > --2020-03-25<br>
> > > > <<br>
> > <a href="http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso--2020-03-25" rel="noreferrer" target="_blank">http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso--2020-03-25</a><br>
> > ><br>
> > > > 13:55:42--<br>
> > > ><br>
> > <a href="http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso" rel="noreferrer" target="_blank">http://mirror.yandex.ru/ubuntu-cdimage/xubuntu/releases/18.04/release/xubuntu-18.04.4-desktop-amd64.iso</a><br>
> > > > Распознаётся <a href="http://mirror.yandex.ru" rel="noreferrer" target="_blank">mirror.yandex.ru</a>… 213.180.204.183, 2a02:6b8::183<br>
> > > > Подключение к <a href="http://mirror.yandex.ru" rel="noreferrer" target="_blank">mirror.yandex.ru</a>|213.180.204.183|:80... соединение<br>
> > > > установлено.<br>
> > > > HTTP-запрос отправлен. Ожидание ответа… 200 OK<br>
> > > > Длина: 1534459904 (1,4G) [application/octet-stream]<br>
> > > > Сохранение в: «xubuntu-18.04.4-desktop-amd64.iso»<br>
> > > ><br>
> > > > xubuntu-18.04.4-desktop-amd64.iso<br>
> > > ><br>
> > 100%[==============================================================================================================>]<br>
> > > > 1,43G 8,26MB/s за 6m 40s<br>
> > > ><br>
> > > > 2020-03-25 14:02:28 (3,66 MB/s) - «xubuntu-18.04.4-desktop-amd64.iso»<br>
> > > > сохранён [1534459904/1534459904]<br>
> > > ><br>
> > > > guest@slax:/dev/shm$ qemu-sy<br>
> > > > qemu-system-aarch64 qemu-system-i386 qemu-system-mips<br>
> > > > qemu-system-nios2 qemu-system-riscv64<br>
> > > > qemu-system-sparc64 qemu-system-xtensaeb<br>
> > > > qemu-system-alpha qemu-system-lm32 qemu-system-mips64<br>
> > > > qemu-system-or1k qemu-system-s390x<br>
> > qemu-system-tricore<br>
> > > > qemu-system-arm qemu-system-m68k<br>
> > qemu-system-mips64el<br>
> > > > qemu-system-ppc qemu-system-sh4<br>
> > > > qemu-system-unicore32<br>
> > > > qemu-system-cris qemu-system-microblaze qemu-system-mipsel<br>
> > > > qemu-system-ppc64 qemu-system-sh4eb<br>
> > qemu-system-x86_64<br>
> > > > qemu-system-hppa qemu-system-microblazeel qemu-system-moxie<br>
> > > > qemu-system-riscv32 qemu-system-sparc<br>
> > qemu-system-xtensa<br>
> > > > guest@slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on<br>
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso<br>
> > > > qemu-system-x86_64: cannot set up guest memory 'pc.ram': Cannot<br>
> > allocate<br>
> > > > memory<br>
> > > > guest@slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on<br>
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso<br>
> > > > guest@slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on<br>
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso<br>
> > -enable-kvm<br>
> > > > -smp 3<br>
> > > > guest@slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on<br>
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso<br>
> > -enable-kvm<br>
> > > > -smp 3<br>
> > > > guest@slax:/dev/shm$ dd if=/dev/zero of=4Gb bs=1k count=4M<br>
> > > > 4194304+0 записей получено<br>
> > > > 4194304+0 записей отправлено<br>
> > > > 4294967296 байт (4,3 GB, 4,0 GiB) скопирован, 20,7155 s, 207 MB/s<br>
> > > > guest@slax:/dev/shm$ qemu-system-x86_64 -m 2000 -display sdl,gl=on<br>
> > > > -soundhw es1370 -usb -cdrom xubuntu-18.04.4-desktop-amd64.iso<br>
> > -enable-kvm<br>
> > > > -smp 4 -hda 4Gb<br>
> > > > WARNING: Image format was not specified for '4Gb' and probing guessed<br>
> > raw.<br>
> > > > Automatically detecting the format is dangerous for raw<br>
> > images,<br>
> > > > write operations on block 0 will be restricted.<br>
> > > > Specify the 'raw' format explicitly to remove the<br>
> > restrictions.<br>
> > > ><br>
> > > > in just a hour I had compiled Cinelerra (by copying git tree from host<br>
> > > > BEFORE launching qemu)<br>
> > > ><br>
> > > > Note, in such mem-restricted VM you want to use zram (not default in<br>
> > this<br>
> > > > ubuntu flavor):<br>
> > > > as root<br>
> > > > modprobe zram<br>
> > > > echo 1000000000 > /sys/block/zram0/disksize<br>
> > > > mkswap /dev/zram0<br>
> > > > swapon /dev/zram0<br>
> > > ><br>
> > > > this will create 1Gb sized compressed swap in ram<br>
> > > ><br>
> > > > I even send email from this virtual setup, but it apparently was stuck<br>
> > in<br>
> > > > moderation<br>
> > > > due to size (over 750 kb).<br>
> > > ><br>
> > > > NOW, I found something really weird!<br>
> > > > Patch as attached worked on 64-bit Ubuntu,<br>
> > > > but for my system I *must*<br>
> > > > place this call to png_set_swap(png_ptr); differently, not before<br>
> > > > png_write_info(png_ptr, info_ptr);<br>
> > > > but AFTER! I actually left both there ....<br>
> > > ><br>
> > > > Still, this is something strange, I'll try to contact libpng author<br>
> > about<br>
> > > > this.....<br>
> > > ><br>
> > > > Also, I attach my current OpenCV tweaks - trim out unneeded stuff,<br>
> > > > fixing two typos, adding -stdc++11 line for my odd system.<br>
> > > ><br>
> > > > I still use opencv-20180401.tgz<br>
> > > ><br>
> > > > I also have two lame (mp3lame) patches, but will send them separately.<br>
> > > > --<br>
> > > > Cin mailing list<br>
> > > > <a href="mailto:Cin@lists.cinelerra-gg.org" target="_blank">Cin@lists.cinelerra-gg.org</a><br>
> > > > <a href="https://lists.cinelerra-gg.org/mailman/listinfo/cin" rel="noreferrer" target="_blank">https://lists.cinelerra-gg.org/mailman/listinfo/cin</a><br>
> > > ><br>
> > ><br>
> ><br>
> ><br>
> > --<br>
> > Cin mailing list<br>
> > <a href="mailto:Cin@lists.cinelerra-gg.org" target="_blank">Cin@lists.cinelerra-gg.org</a><br>
> > <a href="https://lists.cinelerra-gg.org/mailman/listinfo/cin" rel="noreferrer" target="_blank">https://lists.cinelerra-gg.org/mailman/listinfo/cin</a><br>
> ><br>
> <br>
<br>
<br>
-- <br>
Cin mailing list<br>
<a href="mailto:Cin@lists.cinelerra-gg.org" target="_blank">Cin@lists.cinelerra-gg.org</a><br>
<a href="https://lists.cinelerra-gg.org/mailman/listinfo/cin" rel="noreferrer" target="_blank">https://lists.cinelerra-gg.org/mailman/listinfo/cin</a><br>
</blockquote></div>