Please build Linux binary with libpng16-16 and not libpng12-0

[logix2]

The Penguin Subtitle Player Linux binary is built with libpng12-0, which isn't available in Linux distributions for a long time. For example Ubuntu 18.04 (released two years ago) doesn't have it.

When trying to run it I get (and everybody else using a not very old Linux distribution):

./PenguinSubtitlePlayer 
./PenguinSubtitlePlayer: error while loading shared libraries: libpng12.so.0: cannot open shared object file: No such file or directory

Linux distributions nowadays use libpng1.6 (libpng16-16), so please build the Linux binary using this.

Thanks!

[carsonip]

Thanks for reporting an issue. I thought I built a static binary, and I suppose something like this won't happen. What distribution are you using? I am using Linux Mint 19 (Ubuntu 18.04 base) and I didn't get any errors. I think I compiled the program in either Ubuntu 16.04 or 18.04.

[carsonip]

This may be a real problem to many Linux users. I'm digging into it. Here's output of ldd:

ldd PenguinSubtitlePlayer 
    linux-vdso.so.1 (0x00007fff21bdb000)
    libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007fbea66c2000)
    libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007fbea640e000)
    libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007fbea61f3000)
    libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fbea5fcb000)
    libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fbea5c93000)
    libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007fbea5a91000)
    libSM.so.6 => /usr/lib/x86_64-linux-gnu/libSM.so.6 (0x00007fbea5889000)
    libICE.so.6 => /usr/lib/x86_64-linux-gnu/libICE.so.6 (0x00007fbea566e000)
    libpng12.so.0 => /lib/x86_64-linux-gnu/libpng12.so.0 (0x00007fbea5449000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fbea522c000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fbea5028000)
    libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007fbea4d9c000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fbea4b7d000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fbea47f4000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fbea4456000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fbea423e000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbea3e4d000)
    /lib64/ld-linux-x86-64.so.2 (0x00007fbea6907000)
    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fbea3c1b000)
    libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007fbea39e9000)
    libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fbea37e5000)
    libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fbea35df000)
    libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007fbea33d8000)
    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007fbea31c3000)
    libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007fbea2f92000)
    libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007fbea2cdc000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fbea2ad4000)

[logix2]

This happens in both Ubuntu 18.04 and 20.04. I think you compiled it on 16.04, because it still has libpng12-0. I don't know about Linux Mint (which even though is based on Ubuntu has its own repository too), but Ubuntu 18.04 definitely doesn't have libpng12-0.

See here the supported Ubuntu versions that still have libpng12-0: https://packages.ubuntu.com/search?keywords=libpng12-0

[carsonip]

Right. I'll try to fix my static Qt build to eliminate this issue. I see it is possible to configure Qt to use its bundled libpng instead of system's libpng. I bet it would eliminate the need of dynamically linked libpng. I'll get back to you when I get something.

[carsonip]

I'm sorry that the "static" build of the player is kind of fragile. Building a static binary that works on Linux is not a trivial problem, especially when I didn't check ldd output before. A good lesson to myself.

[carsonip]

The problem I get into today is that I can get rid of libpng16, but the dynamic link to libfreetype will create link to libpng12. However, using Qt's bundled freetype breaks the application. I'll try to find a solution.

[alexhk90]

While it doesn't solve the issue with the Linux binary (which would be good to fix), does Ubuntu have a way of building from source? I just tried the Arch Linux AUR package (which builds from the git source) and it seems to work well with the latest version (1.3.0).

PS: @carsonip As I didn't see a way of commenting on the v1.3.0 release, just wanted to say thanks for continuing development on this.

[carsonip]

Hey @alexhk90, thanks for being a long time supporter of Penguin Subtitle Player!

I think there should be a way to build from source on apt install, which should be easy with libqt. Currently Ubuntu users are directed to WebUpd8 to download a deb, but they don't update that often.

Anyway, a possible fix to this issue may be using a Ubuntu 18.04 VM to do the compilation. I'll do it when I get some time.

[carsonip]

Here's the ldd output when I build it with Ubuntu 18.04:

    linux-vdso.so.1 (0x00007ffc5bdf8000)
    libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1 (0x00007f55f7335000)
    libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f55f7081000)
    libxcb-glx.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-glx.so.0 (0x00007f55f6e66000)
    libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1 (0x00007f55f6c64000)
    libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f55f692c000)
    libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f55f6704000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f55f6500000)
    libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f55f6274000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f55f6055000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f55f5ccc000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f55f592e000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f55f5716000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f55f5325000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f55f8878000)
    libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f55f50f3000)
    libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f55f4ec1000)
    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f55f4ca4000)
    libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f55f4aa0000)
    libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f55f489a000)
    libGLX.so.0 => /usr/lib/x86_64-linux-gnu/libGLX.so.0 (0x00007f55f4669000)
    libGLdispatch.so.0 => /usr/lib/x86_64-linux-gnu/libGLdispatch.so.0 (0x00007f55f43b3000)
    libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f55f419e000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f55f3f96000)

I'll see if I can get any better results, otherwise this should be it.

[JackieMium]

Here's the ldd output when I build it with Ubuntu 18.04: I'll see if I can get any better results, otherwise this should be it.

I think this is it. I got the same error msg running the 1.3.0 binary version, I then built it it on my Debian sid box with Qt 5.12.5 and libpng against libpng16-16 and it worked too. Qt creator build also works and linked against libpng16.

[carsonip]

Here's the ldd output when I build it with Ubuntu 18.04: I'll see if I can get any better results, otherwise this should be it.

I think this is it. I got the same error msg running the 1.3.0 binary version, I then built it it on my Debian sid box with Qt 5.12.5 and libpng against libpng16-16 and it worked too. Qt creator build also works and linked against libpng16.

Yes, I will compile the next version with Ubuntu 18.04.

[carsonip]

Fixed in v1.3.1