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#1 |
Posts: n/a
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AVI capture sound sync problem (even using 0.8.22 Release 9)
Hi,
I am trying the new release 9 which is supposed to fix the AVI recording sound sync problem. Trying to record "Desert Dream", I got 8 AVI files. (The file split is great!) ![]() When each file is opened separately, the sound seems to be synced at the begining. Unfortunately, some AVI files contain too much sound data! Let me explain : I recorded at 50 fps, 48000hz sample rate, video codec=Huffyuv (RGB), audio = PCM uncompressed. In a normal situation, it should lead to 960 audio samples by frame. Here is the frame count / sample data of each AVI. Between parenthesis is the frame count actually covered by the audio data, (sample data / 960) : 0 : 5771 / 5541248 (5772.13) 1 : 5706 / 5478784 (5707.06) 2 : 4896 / 5095808 (5308.13) 3 : 5910 / 5673600 (5910.00) 4 : 6061 / 5818624 (6061.06) 5 : 5509 / 5288704 (5509.06) 6 : 5686 / 7083136 (7378.26) 7 : 5467 / 10409856 (10843.60) As you can see, some AVI files contains far more audio samples than required. I listened to the "superfluous" audio parts and they are actually parts of the original music, not a repetition of the previous seconds or garbage... Because of that, when I merge the AVI files together (either using VirtualDub or AviSynth) the sound get un-synchronized as from AVI 3. I made an other try using video codec Huffyuv (convert to YUY2) and I ended up with 5 AVI files. Here are the frame count / audio data : 0 : 9623 / 9239168 (9624.13) 1 : 8889 / 8908288 (9279.46) 2 : 9660 / 9273600 (9660) 3 : 9040 / 8684160 (9046) 4 : 5018 / 9032192 (9408.53) I can understaind the difference for 1 or 2 frames, but a difference of more than 1500 frames is abnormal. ![]() I hope somebody (Toni?) will be able to find the cause, and fix it. I attached my WinUAE config file : |
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#2 |
Registered User
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Make sure that you turn JIT OFF, otherwise audio will not sync!
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#3 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,574
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Make sure winuae won't lose focus during recording, losing/gaining focus resets sound subsystem..
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#4 |
Posts: n/a
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JIT is off (everything is grayed out) as I am only emulating a 68000.
Or should I do something special to disable it ? WinUAE have the focus from the begining till to end, I actually don't use the PC when I am capturing. I am running WinXP (home) on a Dell Dimension 8250 (2.4Ghz CPU, 512 Mb Ram and 20 Gb free hard disk). I am capturing in windowed mode. Any idea ? |
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#5 |
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I just made an other test, in full screen, here is the frames / samples count :
0 : 7855 / 7541888 (7856.13) 1 : 7254 / 7370752 (7677.86) 2 : 7033 / 6751616 (7032.93) 3 : 8050 / 7728000 (8050.00) 4 : 7351 / 7056896 (7350.93) 5 : 8066 / 15171584 (15803.73) The part 5 contain the scrolling ending credits, I suppose the video bitrare is lower on this part as it only contain B/W text. I am using Huffyuv as video codec. It seems at each try, the first mis-sync came around frame 11400 and 15100. The second one on the ending credits. Maybe it's caused by a drop on the video bitrate ??? I'll try to make an other test using DivX |
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#6 |
Posts: n/a
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I just made a new recording test, this time using Fraunhofer MP3 at 128 kbps for audio and DivX 5.0.3 at 768 kbps for video.
The sound corresponding to the visual effect at 7:33 is played at 7:48 (15 seconds delay) The sound corresponding to the visual effect at 12:29 is played at 12:47 (18 seconds delay) :eek Actually the delay is far bigger than with Release 7 of WinUAE ![]() I'll try an other test, the last one, on a different computer running Win 2000. I really hope we will figure out where does this problem come from. |
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#7 |
Posts: n/a
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Hi,
I just made an other test on a different computer : Compaq iPAQ 1 Ghz, 256 Mb ram, 9 Gb free disk space. Running under Windows 2000 SP3 Due to lack of disk space, I made the capture in Lores (400*300) I used the "Huffyuv v2.1.1 - CCESP Patch v0.2.2" video codec (in "Convert to YUY2" mode) and PCM for audio. To my surprise, this time the sound IS synchronized. I don't know whether it is thanks to the OS (Win 2000), the different video codec, or the lores. I'll try to make further investigation, and I'll keep you informed. |
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