Please describe the problem:
Playback of a movie with the "Techsmith Camtasia video" codec using GStreamer fails with:

ERROR ffmpeg :0:: Camtasia error: unknown depth 0 bpp

It appears the caps don't set the AVCodecContext->bits_per_sample to the correct value which actually seems to be stored in the AVI (24bpp in this case).

Steps to reproduce:
---

GST_DEBUG="avi*:5,ffmpeg*:5" gst-launch gnomevfssrc location=http://videos.aircrack-ng.org/WEP_Cracking_with_Airoscript.avi ! avidemux ! ffdec_camtasia ! ffmpegcolorspace ! xvimagesink

---

Actual results:
You see the log ouput.

Expected results:
Video should play.

Does this happen every time?
Yes.

Other information:
I have a lack of overview thus unable to fully find the cause of the problem and fixing the issue completly.

All I know is that manually setting/enforcing the bits_per_sample makes it work:

--- ext/ffmpeg/gstffmpegcodecmap.c      11 Jan 2007 10:02:40 -0000      1.137
+++ ext/ffmpeg/gstffmpegcodecmap.c      20 Jan 2007 23:16:46 -0000
@@ -1571,11 +1577,14 @@
 
     case CODEC_ID_MSRLE:
     case CODEC_ID_QTRLE:
+    case CODEC_ID_TSCC:
     {
       gint depth;
 
       if (gst_structure_get_int (str, "depth", &depth))
         context->bits_per_sample = depth;
+
+      context->bits_per_sample = 24;
     }
       break;