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mp4 slow playback
I have a problem with when I use compressor to make a 1920×1080 mpeg4 it won’t play in sync with its audio. The video plays at a slower rate. When I upload it to You Tube it plays fine as it does also on a MacBook. If I choose a 1280×720 mpeg4 it plays fine. It also plays fine from the quicktime prores exported from the time line. I just update the OS to 10.6.7 and the problem is still there.
Any idea how to fix this?MacPro quad 2.6 ghz, 10GB ram , ATI Radeon X1900 XT 512mb vram
Alan Stephens
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17 Replies
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Encode to 1280 x 720 and don’t look back.
Rich Rubasch
Tilt Media Inc.
Video Production, Post, Studio Sound Stage
Founder/President/Editor/Designer/Animator
https://www.tiltmedia.com -
[Alan Stephens] ” The video plays at a slower rate. When I upload it to You Tube it plays fine as it does also on a MacBook”
When you say it plays fine, what do you mean? It plays okay at 1080 on youtube? It plays okay at 1080 on a Macbook?
If it plays okay on both of these, but not your MacPro, something ain’t right on your macpro. Could you trying playing it back in QuickTime X (or QuickTime 7) just to see it differently?
Best,
Jeff G
Apple Master Trainer | Avid Cert. Instructor DS/MC | Adobe Cert. Instructor
————
You should follow me (filmgeek) on twitter. I promise to be nice.
Come See me speak at NAB!
Compressor Essentials from Lynda.com
(older but still good) Marquee, Media Composer (3.5) and Basic/Advanced Color DVDs (1.0) from Vasst.com
Contact me through my Website -
Yes it plays fine in 1080p on you tube made from the mpeg4 that doesn’t stay in sync on my macpro.
It plays in sync on a slower macbook. The master ProRes file from which I compressed the mpeg4
stays in sync on my MacPro. All files have been tested in Quicktime 7. Sometimes the 1080p mpeg4
plays back jerky with stops and starts, like the hardware can’t handle it, yet the hardware can play the
larger ProRes master file in 1080P. Yes something is clearly wrong with the MacPro, but where do I start?Alan Stephens
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Alan,
Humor me here – I’m assuming you’re on Snow Leopard (which of course, could be wrong.) Could you test it in Quicktime X?
If you have VLC player, could you test it there (and if you don’t have it, could you download it and test it.)Each plays back h.264 files down a different path.
I’m trying to see if it’s flawed everywhere or just via QT7.
Best,
Jeff G
Apple Master Trainer | Avid Cert. Instructor DS/MC | Adobe Cert. Instructor
————
You should follow me (filmgeek) on twitter. I promise to be nice.
Come See me speak at NAB!
Compressor Essentials from Lynda.com
(older but still good) Marquee, Media Composer (3.5) and Basic/Advanced Color DVDs (1.0) from Vasst.com
Contact me through my Website -
I’ve been following this thread and a few things aren’t clear to me.
Compressor generally doesn’t create H.264 .mp4, only the older variety MPEG 4 Part 2 (H.264 is MPEG 4 Part 10) (although you can create an .m4v using an iOS preset and change the extension).
Exactly what setting did you use to create the .mp4?
What data rate did you use?GOP codecs are harder to playback than I Frame codecs like Apple ProRes on many systems.
Perhaps the data rate of your MPEG4 is too high to play cleanly. -
I tested it in Quicktime 7.6.6, and yes I am on Snow Leopard 10.6.7 the most recent update.
The video clip is 1:37 minutes and this happens with any other clip I make mpeg4 1080P.
Is Quicktime X the same as QT7? I did another test and compressed the master file into a 1080P H.264
and it plays in sync.
As for the VLC player I hesitate to junk up my system with unnecessary software.Alan Stephens
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in compressor under Quicktime settings there is a Quicktime H.264
under Formats there is a MPEG-4 folder and in it is a preset MPEG-4 which is what I used.
I tried on at low VBR and it still plays out of sync.
The audio will finish and the video still hasn’t caught up. Sometimes the video will play a frame every quarter second or so, for a bit and then play a 1 second segment then go back to jerky playback.Alan Stephens
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[Alan Stephens] “in compressor under Quicktime settings there is a Quicktime H.264
under Formats there is a MPEG-4 folder and in it is a preset MPEG-4 which is what I used.”That is not H.264. It’s an older MPEG4 codec. Unless your targeting an old computer whose Quicktime predates 7 or, I suspect, some old feature phones, there’s no contemporary reason to use that codec.
Did you use Basic or Improved?
What is your keyframe interval? -
I tested a 6 minute 1080p30 file using the aforementioned preset modified to use Low VBR. The file was about 1800kbps. The sync was soft in QTX, but looked good in QT7.6.6. MacPro 8 Core (2.8GHz MacPro 3.1, OX 10.6.7)
Rather than fight this problem, use H.264 .mov.
I really can’t understand why you’d choose you use an old codec. -
I was using this codec because I was under the impression it was compatable with Windows.
I don’t remember why I thought that but after testing it on a pc just now, it seems it is not. What I need is
a codec that is HD & both mac and pc playable using compressor, without my client having to downlad QT.
I can buy software to make HD wmv files but not thru Compressor.
Some of my (PC) clients have been asked for mpeg4.Alan Stephens
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