The following code produces a copy of an amr file that's double the length; the file seems to be played twice:
The workstation's media player plays what sounds like the original being played twice, which is the desired result. However, the Samsung GT-C3053 cellphone plays for the time of the original file and then stops with a FAILED message. This happens whether the original's length is 3 s or 3 minutes. Is there a way to tweak the amr file so that it's acceptable to the cell's media player and not only that of the Ubuntu box?
cp original.amr copy.amr
cat copy.amr >>original.amr