Add argument to mythtranscode for select audio track

This change allows a user to select which audio track to extract/transcode
when using mythtranscode.

Slightly modified patch from #9541 (fixed the exit code)

mythtv/programs/mythtranscode/main.cpp

@@ -66,6 +66,7 @@ static void usage(char *progname)
     cerr << "\t                or -ro: Pass a comma-separated list of\n";
     cerr << "\t                        recordingprofile options to override\n";
     cerr << "\t                        values in the database.\n";
+    cerr << "\t--audiotrack <trackno>: Selects the audiotrack for transcoding.\n";
     cerr << "\t--verbose level  or -v: Use '-v help' for level info\n";
     cerr << "\t--help           or -h: Prints this help statement.\n";
 }
@@ -149,6 +150,7 @@ int main(int argc, char *argv[])
     frm_dir_map_t deleteMap;
     frm_pos_map_t posMap;
     srand(time(NULL));
+    int AudioTrackNo = -1;
 
     QCoreApplication a(argc, argv);
 
@@ -474,6 +476,22 @@ int main(int argc, char *argv[])
 
             ++argpos;
         }
+        else if (!strcmp(a.argv()[argpos],"--audiotrack"))
+        {
+            if (a.argc()-1 > argpos && a.argv()[argpos+1][0] != '-')
+            {
+                AudioTrackNo = QString(a.argv()[argpos + 1]).toInt();
+            }
+            else
+            {
+                cerr << "Invalid or missing argument to --audiotrack "
+                        "option\n";
+                usage(a.argv()[0]);
+                return GENERIC_EXIT_INVALID_CMDLINE;
+            }
+
+            ++argpos;
+        }
         else if (!strcmp(a.argv()[argpos],"-h") ||
                  !strcmp(a.argv()[argpos],"--help"))
         {
@@ -639,7 +657,7 @@ int main(int argc, char *argv[])
         result = transcode->TranscodeFile(infile, outfile,
                                           profilename, useCutlist,
                                           (fifosync || keyframesonly), jobID,
-                                          fifodir, deleteMap);
+                                          fifodir, deleteMap, AudioTrackNo);
         if ((result == REENCODE_OK) && (jobID >= 0))
             JobQueue::ChangeJobArgs(jobID, "RENAME_TO_NUV");
     }

mythtv/programs/mythtranscode/transcode.cpp

@@ -363,7 +363,8 @@ int Transcode::TranscodeFile(
     const QString &profileName,
     bool honorCutList, bool framecontrol,
     int jobID, QString fifodir,
-    frm_dir_map_t &deleteMap)
+    frm_dir_map_t &deleteMap,
+    int AudioTrackNo)
 {
     QDateTime curtime = QDateTime::currentDateTime();
     QDateTime statustime = curtime;
@@ -718,6 +719,12 @@ int Transcode::TranscodeFile(
         return REENCODE_ERROR;
     }
 
+    if (AudioTrackNo > -1)
+    {
+        VERBOSE(VB_GENERAL, QString("Set audiotrack number to %1").arg(AudioTrackNo));
+        player->GetDecoder()->SetTrack(kTrackTypeAudio, AudioTrackNo);
+    }
+
     int vidSize = 0;
 
     // 1920x1080 video is actually 1920x1088 because of the 16x16 blocks so

mythtv/programs/mythtranscode/transcode.h

@@ -20,7 +20,8 @@ class Transcode : public QObject
         const QString &outputname,
         const QString &profileName,
         bool honorCutList, bool framecontrol, int jobID,
-        QString fifodir, frm_dir_map_t &deleteMap);
+        QString fifodir, frm_dir_map_t &deleteMap,
+        int AudioTrackNo);
     void ShowProgress(bool val) { showprogress = val; }
     void SetRecorderOptions(QString options) { recorderOptions = options; }