- args += ['-f', 'mp4', '-bsf:a', 'aac_adtstoasc']
+ args += ['-f', 'mp4']
+ if (ffpp.basename == 'ffmpeg' and is_outdated_version(ffpp._versions['ffmpeg'], '3.2')) and (not info_dict.get('acodec') or info_dict['acodec'].split('.')[0] in ('aac', 'mp4a')):
+ args += ['-bsf:a', 'aac_adtstoasc']