Target Size Mode: Account for multiple audio tracks

Author: n00mkrad

ff-utils-winforms/UI/Tasks/QuickConvertUi.cs

@@ -275,14 +275,16 @@ private static int GetVideoBitrate()
 
             if ((QualityMode)Program.mainForm.encQualModeBox.SelectedIndex == QualityMode.TargetMbytes)
             {
-                int audioBps = (int)form.encAudQualUpDown.Value * 1024;
+                bool aud = !CodecUtils.GetCodec(GetCurrentCodecA()).DoesNotEncode;
+                int audioTracks = form.streamListBox.CheckedItems.OfType<MediaStreamListEntry>().Where(x => x.Stream.Type == Stream.StreamType.Audio).Count();
+                int audioBps = aud ? ((int)form.encAudQualUpDown.Value * 1024) * audioTracks : 0;
                 double durationSecs = TrackList.current.DurationMs / (double)1000;
                 float targetMbytes = form.encVidQualityBox.Text.GetFloat();
                 long targetBits = (long)Math.Round(targetMbytes * 8 * 1024 * 1024); 
                 int targetVidBitrate = (int)Math.Floor(targetBits / durationSecs) - audioBps; // Round down since undershooting is better than overshooting here
                 string brTotal = (((float)targetVidBitrate + audioBps) / 1024).ToString("0.0");
                 string brVid = ((float)targetVidBitrate / 1024).ToString("0");
-                string brAud = form.encAudQualUpDown.Value.ToString();
+                string brAud = ((float)audioBps / 1024).ToString("0");
                 Logger.Log($"Target Filesize Mode: Using bitrate of {brTotal} kbps ({brVid}k Video, {brAud}k Audio) over {durationSecs.ToString("0.0")} seconds to hit {targetMbytes} megabytes.");
                 return targetVidBitrate;
             }