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musv
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Joined: 01 Dec 2002
Posts: 3337
Location: de
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 Posted: Tue Dec 09, 2008 10:14 pm Post subject: [solved] video merge - audio and video out of sync |
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Hi,
I tried to merge 2 xvid/avi videos. After the merge process I recognized that the audio track isn't synchron to the video track anymore. The difference is about 1 second.
First trial was with mencoder:
| Code: | | mencoder *.avi -ovc copy -oac copy -o Movie.avi |
I got the error messages:
| Code: | Erfolg: Format: 0 Daten: 0x0 - 0x2bc8a800
AVI-Dateiformat erkannt!
[aviheader] Videostream gefunden, -vid 0
[aviheader] Audiostream gefunden, -aid 1
VIDEO: [XVID] 640x272 12bpp 25.000 fps 1055.1 kbps (128.8 kbyte/s)
[V] Dateiformat:3 fourcc:0x44495658 Größe:640x272 fps:25.000 ftime:=0.0400
Videocodec: Framecopy (640x272 12bpp fourcc=44495658)
Audiocodec: Framecopy (Format=55 chans=2 Rate=48000 Bits=0 B/s=19447 Sample-0)
Schreibe Dateikopf...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Schreibe Dateikopf...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header.
Pos: 0.9s 22f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [0:299]
Frame übersprungen!
Pos: 1.2s 32f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [72:268]
Frame übersprungen!
Pos: 1.6s 42f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [57:247]
Frame übersprungen!
Pos: 2.0s 52f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [70:232]
Frame übersprungen!
Pos: 2.3s 62f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [60:220]
Frame übersprungen!
Pos: 2.7s 72f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [53:211]
Frame übersprungen!
Pos: 3.0s 82f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [48:205]
Frame übersprungen!
Pos: 3.4s 92f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [43:199]
Frame übersprungen!
Pos: 3.8s 102f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [40:195]
Frame übersprungen!
Pos: 4.1s 112f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [37:192]
Frame übersprungen!
Pos: 4.5s 122f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.084 [34:190]
Frame übersprungen!
Pos: 4.9s 133f ( 0%) 0.00fps Trem: 0min 0mb A-V:0.082 [32:187]
Frame übersprungen!
Schreibe Dateiindex...( 8%) 2648.40fps Trem: 0min 695mb A-V:0.064 [705:155]
Schreibe Dateikopf...
ODML: Aspect information not (yet?) available or unspecified, not writing vprp header. |
Ok, that's the reason. The first frames of video 1 are corrupt, thus mencoder skips that frames.
Next attempt was avidemux. But when I just loaded the 1st video and played it in avidemux, I got the same problem. Video and audio were out of sync. Playing the same video in mplayer works perfectly synchron without errors.
So my question is: How can I force mencoder or avidemux not to skip the first frames.
Last edited by musv on Tue Dec 09, 2008 11:17 pm; edited 1 time in total |
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yabbadabbadont
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Joined: 14 Mar 2003
Posts: 4791
Location: 2 exits past crazy
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| Posted: Tue Dec 09, 2008 10:25 pm Post subject: |
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| If you have transcode installed, try using the avimerge command to merge the two avi files. You might need to use the "-c" option too. |
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musv
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Posts: 3337
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| Posted: Tue Dec 09, 2008 11:17 pm Post subject: |
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Thx, it worked. avimerge showed me
| Code: | | [avimerge] Dropping 10 frames |
but video and audio seems synchronized. |
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yabbadabbadont
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Joined: 14 Mar 2003
Posts: 4791
Location: 2 exits past crazy
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| Posted: Tue Dec 09, 2008 11:22 pm Post subject: |
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It probably had to drop the video frames in order to keep the audio sync'd up. That's what the "-c" option is for. Glad it worked.  |
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