MIDI: Convert BPM to FPS delta time?

If you're talking about 0x00C0 being the time division field, what you're referring to is not 192 beats per minute but rather 192 ticks per beat quite a different beast. BPM is specified indirectly via "Set Tempo" events, given in microseconds per beat (with the lamentably ubiquitous 120 BPM being assumed to begin with). The trickiness of time division with this format is that the length of a tick will grow and shrink depending on the tempo changes in the song Let's say the time division you want to convert to has F as the frames per second (24, 25, 29.97, or 30) and G as the ticks per frame ( note : it's not ticks per minute!).

Further, let's assume that the current tempo in microseconds per beat is p Then the formula to convert a given duration in ticks old to ticks new (the unit analysis really helps! ) is: y = x ticks old (1/192) beat/ticks old p? Sec/beat * (1/10 6 ) sec/?

Sec * F frames/sec * G ticks new frame ((x * p * F * G)/(192*10 6 )) ticks new.

If you're talking about 0x00C0 being the time division field, what you're referring to is not 192 beats per minute, but rather 192 ticks per beat, quite a different beast. BPM is specified indirectly via "Set Tempo" events, given in microseconds per beat (with the lamentably ubiquitous 120 BPM being assumed to begin with). The trickiness of time division with this format is that the length of a tick will grow and shrink depending on the tempo changes in the song.

Let's say the time division you want to convert to has F as the frames per second (24, 25, 29.97, or 30) and G as the ticks per frame (note: it's not ticks per minute! ). Further, let's assume that the current tempo in microseconds per beat is p.

Then the formula to convert a given duration in ticksold to ticksnew (the unit analysis really helps! ) is: y = x ticksold * (1/192) beat/ticksold * p? Sec/beat * (1/106) sec/?

Sec * F frames/sec * G ticksnew/frame = ((x * p * F * G)/(192*106)) ticksnew.

Right. Ticks per beat. Btw, 'tick' size is like TimeSpan.

TicksPerSecond etc.? I am new to MIDI stuff, just trying to get involved. Thanks for you help, your response is indeed complex, it will help if you could simplify it, or else I will have to dig in it more... – Shimmy Jul 8 '10 at 20:05 @Shimmy: They're not the same tick, though the concept is similar. When TimeSpacn refers to ticks, it's referring to a unit that's defined by the OS, which tends to have a fixed relationship to seconds.

Ticks in the MIDI world are an abstract unit defined by the time division, and may or may not have a fixed relationship to seconds or to OS ticks for that matter. The purpose of both ticks is to represent time efficiently by using integer values, yet to choose an interval of time between integers that's small enough to allow you to describe timings moderately precisely. – Owen S.

Jul 8 '10 at 23:21.

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