The Logcat entry that appears when the movie fast forwards is :-
04-18 04:15:27.178 D/dalvikvm(6273)
GC_CONCURRENT freed 4605K,65% free 4154K/11708K, paused 4ms+3ms, total 26ms
WAIT_FOR_CONCURRENT_GC blocked 13ms
04-18 04:15:28.295 D/dalvikvm(6273)
GC_CONCURRENT freed 606K,67% free 3882K/11708K, paused 36ms, total 37ms
04-18 04:15:28.295 I/dalvikvm-heap(6273)
Grow heap (frag case) to 5.101MB for 589840-byte allocation
04-18 04:15:28.334 D/dalvikvm(6273)
GC_CONCURRENT freed 4K,62% free 4454K/11708K, paused 6ms~+5ms, total 43ms
WAIT_FOR_CONCURRENT_GC blocked 25ms
04-18 04:15:28.373 D/dalvikvm(6273)
GC_CONCURRENT freed <1K,58% free 5030K/11708K, paused 34ms, total 43ms
04-18 04:15:28.412 D/dalvikvm(6273)
GC_CONCURRENT freed <1K,58% free 5606K/11708K, paused 32ms, total 32ms
04-18 04:15:28.451 D/dalvikvm(6273)
GC_CONCURRENT freed <1K,48% free 6182K/11708K, paused 31ms, total 32ms
04-18 04:15:28.498 D/dalvikvm(6273)
GC_CONCURRENT freed <1K,38% free 7335K/11708K, paused 33ms, total 33ms
04-18 04:15:28.537 D/dalvikvm(6273)
GC_CONCURRENT freed <1K,27% free 8559K/11708K, paused 31ms, total 31ms
04-18 04:15:28.545 I/dalvikvm-heap(6273)
Grow heap (frag case) to 9.667MB for 589840-byte allocation
04-18 04:15:28.576 D/dalvikvm(6273)
GC_CONCURRENT freed <1K,26% free 9135K/11708K, paused 33ms, total 33ms
04-18 04:15:28.584 I/dalvikvm-heap(6273)
Grow heap (frag case) to 10.230MB for 589840-byte allocation
04-18 04:15:31.638 I/Choreographer(6273)
Skipped 30 frames! The application may be doing too much work on it's main thread
04-18 04:15:31.521 D/dalvikvm(6273)
GC_CONCURRENT freed 6238K,70% free 3985K/12868K, paused 43ms, total 43ms
I hope this helps someone understand what's going on because it took me ages to type this in (going cross-eyed here)