From: SourceForge.net <no...@so...> - 2012-06-10 06:59:36
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Bugs item #3376087, was opened at 2011-07-23 00:46 Message generated for change (Comment added) made by dragonnet You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=100290&aid=3376087&group_id=290 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Michael Lee Finney (dragonnet) Assigned to: Nobody/Anonymous (nobody) Summary: Assembly Encoding Differences Initial Comment: I have found what appear to be encoding errors using lame 3.84.4. My source file is Anam.waw which was ripped from a reference CD using EAC. I got exactly the same file using different machines. I used the command lines shown below to convert the .wav to .mp3. These give different results on different machines. The only difference in the parameters is the use of assembly. That should be transparent to the results. All command lines should result in identical output files. Test machines 1 and 3 are Intel and give the same results. Test machine 1 is very old and runs Windows 2000. Test machine 3 is fairly new and runs Windows XP. Test machine 3 is an Athelon and runs Windows XP. Output files of the same length are identical. I also used MP3 Checker to validate the output files. All output files passed validation in this test. However, I was lead to this by output files which failed validation and found that the difference was the use of assembly. Since I don't remember the exact parameters or source files I used for that I can't give repeatable examples for that. However, this should suffice to illustrate the differences in encoding that result from using different assembly options. Command lines: lame -q 0 -V 0 -b 64 -B 320 -t --noasm mmx --noasm 3dnow --noasm sse Anam.wav Anam-0.mp3 lame -q 0 -V 0 -b 64 -B 320 -t --noasm mmx --noasm 3dnow Anam.wav Anam-1.mp3 lame -q 0 -V 0 -b 64 -B 320 -t --noasm mmx --noasm sse Anam.wav Anam-2.mp3 lame -q 0 -V 0 -b 64 -B 320 -t --noasm mmx Anam.wav Anam-3.mp3 lame -q 0 -V 0 -b 64 -B 320 -t --noasm 3dnow --noasm sse Anam.wav Anam-4.mp3 lame -q 0 -V 0 -b 64 -B 320 -t --noasm 3dnow Anam.wav Anam-5.mp3 lame -q 0 -V 0 -b 64 -B 320 -t --noasm sse Anam.wav Anam-6.mp3 lame -q 0 -V 0 -b 64 -B 320 -t Anam.wav Anam-7.mp3 Test.1 Output Directory 6,562,849 Anam-0.mp3 6,562,739 Anam-1.mp3 6,562,849 Anam-2.mp3 6,562,739 Anam-3.mp3 6,562,849 Anam-4.mp3 6,562,739 Anam-5.mp3 6,562,849 Anam-6.mp3 6,562,739 Anam-7.mp3 Test.2 Output Directory 6,562,849 Anam-0.mp3 6,562,739 Anam-1.mp3 6,562,741 Anam-2.mp3 6,562,741 Anam-3.mp3 6,562,849 Anam-4.mp3 6,562,739 Anam-5.mp3 6,562,741 Anam-6.mp3 6,562,741 Anam-7.mp3 Test.3 Output Directory 6,562,849 Anam-0.mp3 6,562,739 Anam-1.mp3 6,562,849 Anam-2.mp3 6,562,739 Anam-3.mp3 6,562,849 Anam-4.mp3 6,562,739 Anam-5.mp3 6,562,849 Anam-6.mp3 6,562,739 Anam-7.mp3 Michael Lee Finney ---------------------------------------------------------------------- >Comment By: Michael Lee Finney (dragonnet) Date: 2012-06-09 23:59 Message: I have replicated this problem using 3.99.5. The size of the .mp3 files are slightly different, presumably due to the changes to the .mp3 encoding algorithm. Using exactly the same command lines, here are the current results for Test.1 and Test.2. Test.1 Output Directory 7,230,062 Anam-0.mp3 7,229,957 Anam-1.mp3 7,230,062 Anam-2.mp3 7,229,957 Anam-3.mp3 7,230,062 Anam-4.mp3 7,229,957 Anam-5.mp3 7,230,062 Anam-6.mp3 7,229,957 Anam-7.mp3 Test.2 Output Directory 7,230,062 Anam-0.mp3 7,229,957 Anam-1.mp3 7,230,055 Anam-2.mp3 7,229,957 Anam-3.mp3 7,230,062 Anam-4.mp3 7,229,957 Anam-5.mp3 7,230,055 Anam-6.mp3 7,229,957 Anam-7.mp3 Michael Lee Finney -------------------------------------------------------------------------------- ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=100290&aid=3376087&group_id=290 |