I have found the methods that return technical information about media to be a bit inconsistent.
Firstly, the getVideoCodecName() method always returns null, but getVideoCodec() returns an int. How can I get the codec name as a string like it is in the console output:
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 640x360 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn
I'm talking about the h264 (High) string.

Secondly, the getVideoBitrate() and getAudioBitrate() methods work on mp4 and mp3 files, but not on some others. I have also noticed that these methods return a correct value when the bitrate also gets exposed on the stream line in the console output.

This is part of a console output from an flv file:
Duration: 00:24:19.53, start: 0.037000, bitrate: 451 kb/s
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 640x360 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn
Stream #0:1: Audio: aac (LC), 44100 Hz, stereo, fltp, 128 kb/s

As you can see Stream #0.0 (video stream) does not show a bitrate and calling getVideoBitrate() will return 0.
Stream#0.1 (audio stream) does show a bitrate here of 128kb/s and calling getAudioBitrate() will work as intended.
However the first line shows a bitrate of 451kb/s. So how can I get access to that value?