Revise transcode_aac example and various updates (#147)
#396
| Job | Run time |
|---|---|
| 5m 23s | |
| 27m 7s | |
| 5m 39s | |
| 6m 54s | |
| 7m 26s | |
| 53s | |
| 1h 5m 24s | |
| 28s | |
| 7m 38s | |
| 40s | |
| 7s | |
| 7m 21s | |
| 2m 34s | |
| 3m 21s | |
| 2h 20m 55s |