When you run
ffmpeg -i with the video file as input parameter, ffmpeg returns some details of the stream type, like codec, bitrate and resolution. What does the other data mean - "tbr", "tbn" and "tbc"? From my examples below, you can see that they vary a lot.
Stream #0.0(und): Video: h264, yuv420p, 1280x720, 25 tbr, 25 tbn, 50 tbc
Stream #0.0(eng): Video: h264, yuv420p, 640x480, 22050 tbr, 22050 tbn, 44100 tbc
Stream #0.1: Video: wmv3, yuv420p, 1280x720, 4000 kb/s, 29.97 tbr, 1k tbn, 1k tbc
Secondary question: why is not bitrate always shown?