The bundled sample video (Hero_Sample_Video.mp4) is playing nice and smooth. However, when I try to encode a file in the same format with ffmpeg, I get jerky playback. Videos seem to play slower, then quicker, then slower, etc. I'm encoding with the same settings as the sample clip, i.e. H.264, 480x320 and 48 kHz Stereo AAC audio. I have tried low and high bitrates, different quantizers and even two different containers: MP4 and M4V. I fail to obtain smooth playback even with the H.264 settings from https://help.ubuntu.com/community/AndroidVideoEncoding aimed at Android phones. Smooth video playback is obviously possible on this phone, since the 30 FPS full screen sample clip plays back without a hitch, so what are the secret flags I need to pass ffmpeg to attain this holy grail?