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1 # We want to split the files, preserving their original compression with as few possible clicks.
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2 # This means we have to align all of our track offsets as frames.
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3
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4 import sys
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5
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6
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7 def get_closest_aligned_time(target_time: float, sample_rate: float) -> int:
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8 # Convert target time into an exact amount of samples first.
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9 # We obviously can't have a fraction of a sample.
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10 samples = int(round(target_time * sample_rate))
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11
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12 # Round to the nearest frame multiple. Note that AAC frames are
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13 # *usually* (but not always) 1024 samples in size.
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14 frames = samples - samples % 1024
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15
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16 return frames / sample_rate
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17
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18
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19 # sample rate is first argument
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20 sample_rate = float(sys.argv[1])
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21
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22 # rest of the arguments are the times to align.
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23 # Hopefully giving these values as microseconds will help
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24 # ffmpeg realize it should cut along frame boundaries.
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25 for i in sys.argv[2:]:
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26 x = get_closest_aligned_time(float(i), sample_rate)
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27 print("%f\n" % x, end="")
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28 print("%f," % x, end="")
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