feat: let the viewer pick the audio track

The streaming path mapped 0:a:0 unconditionally, so a dubbed film played in
whichever language was muxed first and the others were unreachable. The node
now enumerates the tracks in stream_init and honours audio_track in
stream_req; switching is the seek path, since one ffmpeg carries one track.

MNP 3.2, additive: the player draws its selector from the node's own list and
never from a version number, so an older node is never asked for a track it
would ignore. MNP_MIN_SUPPORTED does not move.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/indexer/enrich.py b/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
index 19ab9ce..6eeb1ef 100644
--- a/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
+++ b/packages/meshbay-node/src/meshbay_node/indexer/enrich.py
@@ -238,11 +238,12 @@ class Enricher:
                 duration = cached_meta["duration"]
             else:
                 try:
-                    _codec, duration, _has_audio, width, height, _raw = await asyncio.wait_for(
+                    probe = await asyncio.wait_for(
                         probe_video(str(file_path)), timeout=PROBE_TIMEOUT_SECS)
+                    duration = probe.duration
                     fields["duration"] = int(duration) if duration else None
-                    fields["width"] = width
-                    fields["height"] = height
+                    fields["width"] = probe.width
+                    fields["height"] = probe.height
                 except Exception as e:
                     log.warning("Probe failed for %s: %s", file_path, e)
                 await self._media_cache.put_video_meta(