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As noted in comment above, I've been struggling with this as well on a PI 3b+.

Here is what I learned. ogg is part of the theora video codec and transport. I guess it comes as part of ubuntu but not raspbian stretch.

You need to install the source and make it.

Here is what I used:

cd ~

wget http://downloads.xiph.org/releases/ogg/libogg-1.3.1.tar.gz
tar -xf libogg-1.3.1.tar.gz 
cd libogg-1.3.1/
./configure --host=arm-unknown-linux-gnueabi --enable-static
make
sudo make install

cd ~

wget http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.3.tar.gz
tar -xf libvorbis-1.3.3.tar.gz
cd libvorbis-1.3.3/
./configure --host=arm-unknown-linux-gnueabi --enable-static
make
sudo make install

cd ~

wget http://downloads.xiph.org/releases/theora/libtheora-1.1.1.tar.bz2
tar -xf libtheora-1.1.1.tar.bz2 
cd libtheora-1.1.1/
./configure --host=arm-unknown-linux-gnueabi --enable-static
make
sudo make install

I got the info from this link but the flow is incorrect. Do it in the order I use above. https://www.codepool.biz/raspberry-pi-live-streaming-usb-webcam.html