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ffprobe - Streams - Get stream fields

ffprobe -v 0 -select_streams a -show_entries stream file

returns:

[STREAM]
index=1
codec_name=ac3
codec_long_name=ATSC A/52A (AC-3)
profile=unknown
codec_type=audio
...
TAG:language=eng
...
[/STREAM]

NOTE: This queries all audio streams.

Change the a for a:0 or a:1 to specify a specific stream.

ffprobe -v 0 -select_streams a:0 -show_entries stream file

Be aware that the result is not returned in the order specified in the command. It is in the order that the metadata is in the file.