Note that the above adds "-movflags faststart" to the mp4 creation. This causes a second pass on the file (slow, sadly) that moves the metadata to the start of the file, making it faster for a web browser to seek into the middle of the file. Instead of "-movflags faststart" you can use the tool qt-faststart.
+By default ffmpeg seems to use a number of threads equal to the number of cores you have minus 1. You can speed things up by specifying your actual number of cores. For example "-threads 2" forces 2 threads.
+
+{section: Extracting a poster}
+
+Ideally you want a poster image for the browser to display before the video is loaded. Here is a quick and dirty way to exact the first frame. Instead of "0" for "-ss", you can specify a number of seconds into the video to sample. You can also specify HH:MM:SS.mm.
+
+{code}
+ffmpeg -i input.mp4 -ss 0 -vframes 1 input.jpg
+{endcode}
+
{section: Editing with ffmpeg}
This is probably unnecessary if you have a full blown video editor, but occasionally quick command line tools are useful.
