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    <p>I imagine they chose to report TBR because that is <a href="https://stackoverflow.com/questions/3199489/meaning-of-ffmpeg-output-tbc-tbn-tbr">ffmpeg's best guess</a> as to what the framerate actually is. On many containers, the fps field (more specifically <code>AVStream.avg_frame_rate</code>) is not available, so it can't really be relied upon.</p> <p>Here are the comments from the <code>ffmpeg</code> source on the tbr, tbc, and tbn fields:</p> <p><strong>TBR (ffmpeg's best guess):</strong></p> <pre><code>struct AVStream { ... /** * Real base framerate of the stream. * This is the lowest framerate with which all timestamps can be * represented accurately (it is the least common multiple of all * framerates in the stream). Note, this value is just a guess! * For example, if the time base is 1/90000 and all frames have either * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1. */ AVRational r_frame_rate; </code></pre> <p><strong>TBC (the codec timebase):</strong></p> <pre><code>struct AVCodecContext { ... /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. For fixed-fps content, * time base should be 1/framerate and timestamp increments should be 1. * decoding: set by libavformat * encoding: set by libavformat in av_write_header */ AVRational time_base; </code></pre> <p><strong>TBN (the stream (container) timebase):</strong></p> <pre><code>struct AVStream { ... /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. For fixed-fps content, * timebase should be 1/framerate and timestamp increments should be * identically 1. * - encoding: MUST be set by user. * - decoding: Set by libavcodec. */ AVRational time_base; </code></pre> <p>Hopefully, that explains why TBR is reported instead of FPS. It appears <code>ffmpeg</code> is having difficulty determining the time base for your video stream, and the container (e.g., AVI, MP4, DivX, XviD, etc...) supplies the framerate, so <code>ffmpeg</code> displays it even though it can't determine it through analysis. Is it possible to re-encode the video properly?</p>
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    1. CORe-encoding the video, although doable, would be a hassle since the videos are quite a few and are somewhat long. They are generated from a Network camera. But your answer gave a clear explanation why I get TBR instead of FPS. Thanks!
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