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Mp4a to wav1/4/2024 ![]() We'll end up with 1.003 milliseconds of audio content and file length, and no silence added at the end of the audio data. ![]() Now, if we cut the input file at the next closest multiple of 1024, instead of at 48.000 (which would be at sample 48.128): ffmpeg -i input.wav -c:a aac -b:a 128k -af atrim=end_sample=48128 output.m4a Opening output.m4a in Audacity shows that the audio data has the expected length of 1.000 milliseconds, but the whole file length is 1.003 milliseconds, with a trailing silence of three milliseconds. The first idea would be to simply cut the input data at sample 48.000, which should lead to a 1 second output: ffmpeg -i input.wav -c:a aac -b:a 128k -af atrim=end_sample=48000 output.m4a m4a file without any trailing silence from a wave file with a rate of 48.000Hz. If it isn't, the output will be padded to the next multiple of 1024 samples, which causes the trailing silence.įor example: Imagine you want to create a 1 second. When converting from wav to m4a, the input data must be a multiple of 1024 samples. Just for the records, allow me to answer my own question: So the question now is, how would you convert those files (on Linux or MacOS)? But well, it's still 15 milliseconds too much. Beside that, Track and Master plugins have been disabled, as well as Reverb and Echo, which have also been disabled. Sidenote: To get Garage Band down to 15 milliseconds, the checkbox Export cycle area, or length of selectged regions (if Cycle is turned off) must be set. Trying to convert the file in Garage Band (MacOS) can lead to better results: At best, only 15 milliseconds of silence is added at the end of the clip. m4a, Audacity adds a total of 39 milliseconds of silence at the beginning (15) and at the end (24), which clearly breaks the audio loop. When opening it in Audacity (Ubuntu) and saving it as. One of the input (wav) files is 7.385 seconds long. m4a without having any leading or trailing silence added to the output? The file is supposed to be played in an endless loop, where even a very short silence would be very well noticable. The short question is: How do you convert a. ![]()
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