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Adding audio files (different media info)

See original GitHub issue

Amazing library Pydub!

I’m getting some audio cut out at the end of this attempt to add those 3 files in one: There’s obvious differences between them. What would be your recommended approach to achieve this? The audio cuts at the end by aprox 1 sec. everytime. Tried different files and the same happens. Audio can come in any kind of variation of this examples and any order. Example:

====== NEW AUDIO SOURCE =======
DEBUG:pydub.converter:subprocess.call(['avconv', '-y', '-f', 'mp3', '-i', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmp_Aald3', '-vn', '-f', 'wav', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmpUwSy3h'])
||||||||
Sample Width: 2
Frame Rate: 22050
Frame Width: 4
Channels: 2
Duration in Seconds: 5.48571428571
||||||||

====== NEW AUDIO SOURCE =======
DEBUG:pydub.converter:subprocess.call(['avconv', '-y', '-f', 'mp3', '-i', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmpRSXPFC', '-vn', '-f', 'wav', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmpyuxKub'])
||||||||
Sample Width: 2
Frame Rate: 22050
Frame Width: 4
Channels: 2
Duration in Seconds: 30.8506122449
||||||||

====== NEW AUDIO SOURCE =======
DEBUG:pydub.converter:subprocess.call(['avconv', '-y', '-f', 'mp3', '-i', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmpUUIaqx', '-vn', '-f', 'wav', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmp0QC4l8'])
||||||||
Sample Width: 2
Frame Rate: 24000
Frame Width: 2
Channels: 1
Duration in Seconds: 5.448
||||||||

====== FINAL MIXED AUDIO PARTS =======
||||||||
Sample Width: 2
Frame Rate: 24000
Frame Width: 4
Channels: 2
Duration in Seconds: 41.7842916667
||||||||
DEBUG:pydub.converter:subprocess.call(['avconv', '-y', '-f', 'wav', '-i', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmpN4XkDz', '-f', 'mp3', '/var/folders/1_/551bnby96jb5yy_w__0b9_1r0000gn/T/tmpfmKnzd'])