How to build on Ubuntu 20.04

[jdehaan]

Remove /usr/include from INCLUDEPATH inside pro file and prepend AV_ to some constants appearing in errors on compilation. I could then compile and run the application under focal fossa.

[spiderkeys]

I was also able to get it building on 20.04 by doing the following:

• In qtcam.pro, add "core" and "gui" to the "QT +=" line:

  QT += core gui widgets concurrent multimedia

• In h264decoder.cpp, line 59, add "AV_" to "CODEC_FLAG2_FAST"

  pH264CodecCtx->flags2 |= AV_CODEC_FLAG2_FAST;

• In videoencoder.cpp, line 130, add "AV_" to "CODEC_FLAG_GLOBAL_HEADER"

  pCodecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

• In videoencoder.cpp, line 783, add "AV_" to "CODEC_FLAG_GLOBAL_HEADER"

  c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

I did not need to remove /usr/include from INCLUDEPATH.

[truonggiang0710]

Thanks all.