I tried the emese sample, abx-ing against flac was not hard when focussing on 0:00.5-0:02.1 or 0:03.3-0:04.9. Within the first mentioned range the lossy samples sound with less detail, a bit smeared (if this is the appropriate term) while the second mentioned range was easier to ABX because the lossy samples have some kind of harmonic (higher frequency) distortion. Comparing both lossy files I can safely conclude I prefer 56_12 because it's sounds closer to the flac, the 56_13 contains more distortion, especially in the 0:03.3-0:04.9 range. I tested with headphones.
foo_abx 1.3.4 report
foobar2000 v0.9.6.9 beta 1
2009/08/13 19:20:26
File A: F:\Temp\muaddib\emese.flac
File B: F:\Temp\muaddib\emese_56_12.mp4
19:20:26 : Test started.
19:21:10 : 01/01 50.0%
19:21:21 : 02/02 25.0%
19:21:33 : 03/03 12.5%
19:21:45 : 04/04 6.3%
19:21:57 : 05/05 3.1%
19:22:14 : 06/06 1.6%
19:22:28 : 07/07 0.8%
19:22:43 : 08/08 0.4%
19:22:56 : 09/09 0.2%
19:23:11 : 10/10 0.1%
19:23:21 : 11/11 0.0%
19:23:26 : 12/12 0.0%
19:23:35 : 13/13 0.0%
19:23:46 : 14/14 0.0%
19:23:57 : 15/15 0.0%
19:24:13 : Test finished.
----------
Total: 15/15 (0.0%)
foo_abx 1.3.4 report
foobar2000 v0.9.6.9 beta 1
2009/08/13 21:42:04
File A: F:\Temp\muaddib\emese.flac
File B: F:\Temp\muaddib\emese_56_13.mp4
21:42:04 : Test started.
21:42:40 : 01/01 50.0%
21:42:48 : 02/02 25.0%
21:42:58 : 03/03 12.5%
21:43:05 : 04/04 6.3%
21:43:11 : 05/05 3.1%
21:43:17 : 06/06 1.6%
21:43:23 : 07/07 0.8%
21:43:28 : 08/08 0.4%
21:43:35 : 09/09 0.2%
21:43:42 : 10/10 0.1%
21:43:50 : 11/11 0.0%
21:43:59 : 12/12 0.0%
21:44:09 : 13/13 0.0%
21:44:18 : 14/14 0.0%
21:44:23 : 15/15 0.0%
21:44:32 : Test finished.
----------
Total: 15/15 (0.0%)
foo_abx 1.3.4 report
foobar2000 v0.9.6.9 beta 1
2009/08/13 21:48:47
File A: F:\Temp\muaddib\emese_56_12.mp4
File B: F:\Temp\muaddib\emese_56_13.mp4
21:48:47 : Test started.
21:49:10 : 01/01 50.0%
21:50:16 : 02/02 25.0%
21:50:38 : 03/03 12.5%
21:50:53 : 03/04 31.3%
21:51:18 : 04/05 18.8%
21:51:35 : 05/06 10.9%
21:51:55 : 06/07 6.3%
21:52:07 : 07/08 3.5%
21:53:16 : 08/09 2.0%
21:53:26 : 09/10 1.1%
21:53:38 : 10/11 0.6%
21:53:45 : 10/12 1.9%
21:54:22 : 11/13 1.1%
21:54:36 : 12/14 0.6%
21:54:53 : 13/15 0.4%
21:54:55 : Test finished.
----------
Total: 13/15 (0.4%)
ABX-ing 56_12 against 56_13 was tough although 13/15 in the first attempt suggests the opposite.