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http://ffmpeg-users.933282.n4.nabble.com/ffmpeg-with-libavcoded-with-PNG-support-rpm-needed-td943190.html
Here it says it needs zlib, look for zlib-devel Further check if you have png-devel > > > I have these libs in /usr/lib > /usr/lib/libavcodec.so.52.20.0 > /usr/lib/libavformat.so.52.31.0 > > They got installed when I installed ffmpeg: > $ rpm -q ffmpeg > ffmpeg-0.5-2.fc11.i586 > > So, where do I get an ffmpef RPM which has libavcoded with png ...
https://github.com/LLNL/yorick-z
You also need to have installed zlib (the libz library), libpng, and libjpeg. If libavcodec (part of ffmpeg) is not installed, then yorick-z mpeg support will not work until it is installed. The absence of either the headers or libraries for the other packages will result in them being omitted entirely during the build.
https://blog.csdn.net/shicq0225/article/details/20717889
Mar 08, 2014 · Error: The GUI requires libavcodec with PNG support (needs zlib). 于是安装zlib-devel，却发现： 软件包 zlib-1.2.8-3.fc20.x86_64 已安装并且是最新版本
https://www.makemkv.com/forum/viewtopic.php?t=1540
Jun 17, 2010 · Error: The GUI requires libavcodec with PNG support (needs zlib). Synaptic shows that I do have libavcodec-dev and libavcodec52, both 4.0.5.1 which is latest. Which exact magical incantations are required to use the mkv files on Linux? Thank you, BrianP
https://github.com/Microsoft/vcpkg/issues/1530
Jul 25, 2017 · FFmpeg can not find zlib, so png support failed. #1530. Closed AeolusLau opened this issue Jul 25, 2017 · 3 comments Closed FFmpeg can not find zlib, so png support failed. #1530. AeolusLau opened this issue Jul 25, 2017 · 3 comments ... The reason is that FFmpeg needs zlib to support PNG, but when building FFmpeg, it can not find zlib, which ...
https://www.linuxquestions.org/questions/linux-software-2/error-when-installing-mplayer-on-my-red-hat-877872/
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https://stackoverflow.com/questions/11040847/ffmpeg-png-watermark-issue
It appears your compiled without zlib support which is a requirement for PNG decoding and encoding (refer to the code of the FFmpeg configure file to see what else requires it). For Debian/Ubuntu this means you need zlib1g-dev, or for CentOS zlib-devel, as a build dependency and re-compile FFmpeg.
http://www.ffmpeg-archive.org/FFMPEG-zlib-support-is-required-td4658495.html
That's because you used git clone to install the sources and compiled and installed it yourself. yum/rpm isn't aware of what you install yourself, unless you build an rpm package from your build.
https://stackoverflow.com/questions/27366433/linking-libavcodec-and-libavformat-undefined-references
Dec 08, 2014 · Thank you, that helped. What is the need for these additional libraries, may I ask and why are they needed? I want to further elaborate that when I compiled the program with the default ffmpeg libraries that came with Ubuntu I had no errors and it compiled without the additional flags.
zlib is designed to be a free, general-purpose, legally unencumbered -- that is, not covered by any patents -- lossless data-compression library for use on virtually any computer hardware and operating system.The zlib data format is itself portable across platforms. Unlike the LZW compression method used in Unix compress(1) and in the GIF image format, the compression method currently used in ...
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