[PATCH] av_ff_common: set TRACKNUMBER comment from "track"

[Eric Wong]

ffprobe aways says `track' instead of `TRACKNUMBER'; but
the rest of our code follows FLAC metadata conventions;
so use `TRACKNUMBER'.

(avprobe is untested since the libav project is dead)
---
 lib/dtas/source/av_ff_common.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/dtas/source/av_ff_common.rb b/lib/dtas/source/av_ff_common.rb
index 0c84b2f..3839272 100644
--- a/lib/dtas/source/av_ff_common.rb
+++ b/lib/dtas/source/av_ff_common.rb
@@ -144,6 +144,11 @@ def av_ff_ok?
       comments[k] = -DTAS.try_enc(v, enc)
     end
 
+    # ffprobe always uses "track", favor FLAC convention "TRACKNUMBER":
+    if @comments['TRACK'] && !@comments['TRACKNUMBER']
+      @comments['TRACKNUMBER'] = @comments.delete('TRACK')
+    end
+
     ! @astreams.compact.empty?
   end