本文主要是介绍ubuntu 或者 debian 安装 libpng，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
安装命令：
apt-get install libpng12-dev zlib1g-dev
或者:
apt-get install libpng-dev
日志：
# apt-get install libpng-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'libpng12-dev' instead of 'libpng-dev'
The following packages were automatically installed and are no longer required:libnfsidmap2 libtirpc1
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:zlib1g-dev
The following NEW packages will be installed:libpng12-dev zlib1g-dev
0 upgraded, 2 newly installed, 0 to remove and 15 not upgraded.
Need to get 454 kB of archives.
After this operation, 1,068 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://mirrors.byted.org/debian/ jessie/main zlib1g-dev amd64 1:1.2.8.dfsg-2+b1 [206 kB]
Get:2 http://mirrors.byted.org/debian/ jessie/main libpng12-dev amd64 1.2.50-2+deb8u3 [248 kB]
Fetched 454 kB in 0s (5,565 kB/s)
Selecting previously unselected package zlib1g-dev:amd64.
(Reading database ... 76601 files and directories currently installed.)
Preparing to unpack .../zlib1g-dev_1%3a1.2.8.dfsg-2+b1_amd64.deb ...
Unpacking zlib1g-dev:amd64 (1:1.2.8.dfsg-2+b1) ...
Selecting previously unselected package libpng12-dev:amd64.
Preparing to unpack .../libpng12-dev_1.2.50-2+deb8u3_amd64.deb ...
Unpacking libpng12-dev:amd64 (1.2.50-2+deb8u3) ...
Processing triggers for man-db (2.7.0.2-5) ...
Setting up zlib1g-dev:amd64 (1:1.2.8.dfsg-2+b1) ...
Setting up libpng12-dev:amd64 (1.2.50-2+deb8u3) ...
在 ffmpeg 编译过程中，如果系统有 libpng，在 codecs 中默认会添加 libpng，如果系统中没有 libpng，那么 codec 中默认会不支持 png 的编码；
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