Am Sa., 24. Aug. 2019 um 20:21 Uhr schrieb Rodolfo Medina <rodolfo.medina at gmail.com>: > $ ffmpeg -i fantasia_a_due-prova_13_agosto.m4a -c copy -t 45 output.m4a Use dd instead to cut the sample. If that doesn't work, use qt-faststart first, and then dd. Carl Eugen