[FFmpeg-trac] #2484(avfilter:closed): atempo - low accuracy

FFmpeg trac at avcodec.org
Fri Apr 26 03:49:22 CEST 2013

#2484: atempo - low accuracy
             Reporter:  bars        |                    Owner:  pkoshevoy
                 Type:  defect      |                   Status:  closed
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:  fixed
             Keywords:  atempo      |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |

Comment (by pkoshevoy):

 Try a different file, it will probably be off by some other amount (unless
 both files end the same way, same credits music, etc...)

 If the error is about 1 frame or less (at 24fps) I don't really consider
 it a bug.  It's a limitation of the algorithm.  The output from atempo is
 off a little pretty much all of the time (unless the input is something
 trivial, like silence).  How much off the output is at any instance in
 time depends on the waveform at that time point.  Overall mean error will
 be converging to 0.

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2484#comment:17>
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