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See also: Thanks for that, I noticed the DefaultDuration in the Header Editor section & it states 4170830/1001 & I heard 41708375 is 23976/1000 but even files with 23976/1000 still have the DefaultDuration listed as 41708333 so not sure why the Header Editor does not reflect the small 42 ns difference, perhaps you may know why MKVToolNix's libebml + libmatroska is causing intermittent motion jerkiness where clever ffmpeg-gui program does not on my OPPO BDP-105D player, only TrueHD & E-AC3 JOC streams seem to be Thanks for that, I noticed the DefaultDuration in the Header Editor section & it states 4170830/1001 & I heard 41708375 is 23976/1000 but even files with 23976/1000 still have the DefaultDuration listed as 41708333 so not sure why the Header Editor does not reflect the small 42 ns differenceĭo you know the exact command line you're using via your GUI? If it has If you're worried that an accidental writing error might occur when muxing, then you can simply mux twice with -deterministic and check the 2 files are bit-identical An "insecure" hash like MD5 is enough for this purpose. To make sure the file is not corrupted after years, one can record the hash value of the file.

See also: are some tools that do write ebml CRCs (and there is a tool that can verify it), but like Mosu said, mkvmerge doesn't do that. This system may look confusing and (in specific cases) indeed it can be inconvenient, yet it is much more flexible this way, since one can use a variable frame rate (VFR) easily.

Since each frame has its own timestamp explicitly, this default value is basically irrelevant and unnecessary and generally not used, except maybe when calculating the end time of the very last frame. 24 fps, 23.9760 fps, etc.) but it is only the default value. There is also a per-track metadata called DefaultDuration, which might be 41708333 ns (41.708333 ms ~23.976024168 fps), when an info tool can guess the source video is NTSC (24000/1001 fps) and may show an approximate value of it (e.g. Instead, each frame has its timestamp (by default, the unit is 0.001 second = 1 millisecond aka 1 ms). A Matroska file does not work that way, not directly supporting any fixed frame rate at all.