I have an USB3 camera module that outputs an MJPEG stream. I recorded it with “-v:c copy” argument to an avi file.
Now I want to reencode it to a more compact file in h264/mp4 format. If I do that with default arguments, I get a file with more frames than the original! Also the FPS – as reported by VLC – is 40 fps whereas I know I was recording at about 15 fps (approximately, it varies based on lighting in this camera) If I issue a -r 15 to the input stream when encoding MJPEG to the mp4, then I do get exactly the right frame count. In fact I get the right frame count with -r N for any N. It is wrong, however, to set a fixed rate when I know the camera was working at a variable rate. For our application, we really need to keep the original frames with their original timestamps. My questions are: (1) Does my MJPEG/avi file even contain the time stamps per frame or is this information lost? I know the file has the right total time length, so hoping every frame is also stamped properly. (2) How do transfer the correct time stamps in the reencoded file? _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
