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Movies and Video For people making movies and editing video with their Mac.

mp4 jerky video / out of sync audio Quicktime

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Member Since: Jun 08, 2007
Posts: 43
Jiggy is on a distinguished road

Jiggy is offline
I've downloaded an asf streaming video with vlc player at home and converted it to mp4. It plays fine at home (windows media player). It also plays fine at work on a Apple Tiger 10.4 with VLC Player. When I play it on Quicktime 7.6.4 however, the playback is jerky sometimes. Also the sound isn't always in sync with the images. Why is that?

I've also tried it with two dvd's I've ripped on this Mac with 4media dvd ripper and converted to mp4 in the process. They play fine in VLC player on the Mac, but there's this jerky playback and out of sync audio.

Other formats, like avi or mov play fine in Quicktime.

Can someone explain why my Quicktime has trouble playing mp4 files?
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Member Since: Jun 08, 2007
Posts: 43
Jiggy is on a distinguished road

Jiggy is offline
I've analysed the mp4 file if it helps (see below).

Does Quicktime 7 play mp4 files not that well as VLC Player does? Or is there another problem?

I've installed Quicktime 7 on a Mac 10.4. With Persian and Flip4mac installed. I'm using two monitors side-by-side (if that matters).

*** MediaInfo Mac // Plain text file report
2011-01-25 15:58:22 +0100
Information for File: video.mp4

General / Container Stream # 1
Total Video Streams for this File -> 1
Total Audio Streams for this File -> 1
Video Codecs Used -> AVC
Audio Codecs Used -> AAC LC
File Format -> MPEG-4
Play Time -> 14mn 53s
Total File Size -> 66.5 MiB
Total Stream BitRate -> 625 Kbps
Video Stream # 1
Codec -> AVC
Codec (Human Name) -> Advanced Video Codec
Codec (Container Code) -> avc1
Codec Profile -> High@L1.3
Frame Width -> 352 pixels
Frame Height -> 264 pixels
Frame Rate -> 25.000 fps
Total Frames -> 22312
Display Aspect Ratio -> 4/3
Interlacement -> Progressive
Codec Settings (Summary) -> CABAC / 4 Ref Frames
QF (like Gordian Knot) -> 0.223
Codec Settings (CABAC) -> Yes
Video Stream Length -> 14mn 53s 40ms
Video Stream BitRate -> 518 Kbps
Video Stream BitRate Mode -> VBR
Video Stream Size -> 55.2 MiB
Date of Original Encoding -> UTC 2011-01-20 20:18:42
Audio Stream # 1
Codec -> A_AAC/MPEG4/LC
Codec (Human Name) -> AAC Low Complexity
Codec (Container Code) -> 40
Audio Stream Length -> 14mn 52s 922ms
Audio Stream BitRate -> 100 Kbps
Audio Stream BitRate Mode -> VBR
Number of Audio Channels -> 2
Audio Channel's Positions -> L R
Sampling Rate -> 44.1 KHz
Bit Depth -> 16 bits
Audio Stream Size -> 10.7 MiB
Date of Original Encoding -> UTC 2011-01-20 20:18:42
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