By default yes — a 48 kHz audio track inside WebM becomes 48 kHz inside M4A. If you need 44.1 kHz (CD-quality compatibility) the advanced sample-rate dropdown handles the resample with a high-quality filter (no aliasing artifacts).
Audio extraction is much faster than video re-encoding — typically 5-15% of source duration. A 1-hour WebM → M4A finishes in 3-9 minutes on the standard pipeline; a 5-minute video finishes in under a minute.
M4A formatek pelê deng e ku ji nêz ve bi MP4-ê ve girêdayî ye. Ew bi piştevaniya metadata re berhevkirina deng-kalîteya bilind pêşkêşî dike, ku wê ji bo serîlêdanên cihêreng maqûl dike.