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Re-Editing H.264 Media in Premiere Pro. Problems With A/V Sync.
I have several H.264 .mp4 files that I exported from Premiere CS6 on various preset and custom settings. The only thing they all have in common is H.264 codec. I no longer have the source footage or project files for these as the company I work for doesn’t value the archiving of rushes. But now I’m being asked to re-edit some of them. I only need to make simple cuts. So I import the .MP4 files into Premiere and they look fine at first. However, the audio and video become de-synced/asynchronous over time. The .MP4 files themselves play perfectly in any playback software.
I have looked up what might be causing this and I’m led to believe it’s something to do with variable frame rate encoding. I’m unaware of Premiere’s capabilities in terms of selecting between VFR and CFR. I’ve been working with various versions of Premiere for several years and have never came across these terms. I am of course aware of CBR and VBR, and familiar with the location of the buttons within the ‘export media’ panel. Is CBR/VBR related to frame rate? No, of course not.
So where’s the VFR/CFR selection?
I’m concerned that if I continue to export with my current presets, this will happen again. I won’t be able to archive source footage because the cost is prohibitive (I create approx 100-200GB of video data per week). So the classroom activity that I shoot and edit needs to be re-editable at a later date, in a delivery format/codec. Don’t worry, they’re not full of effects and transitions and sequence rendering is not a problem as I will literally just be cutting and adding the odd title here and there.
So, is there a better delivery codec that I could be using to avoid this A/V sync issue? Is anyone aware of the VFR/CFR capabilities of Adobe Premiere CS6? Is it even possible to select CFR anywhere?
Thanks in advance for the assistance.
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3 Replies
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That’s very uncommon in compression except for some screen capture software and Premiere has no way to to deal with that I know of.
You may have to convert first using a third party app. You can try VLC first and export as another format.
Vince Becquiot
San Francisco Bay Area
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Vince, you’re a genius. A real-time streaming encoder. It all seems so obvious now. Tried it and it worked, I can now re-edit the video with no sync issues.
Now all I need is to find a more suitable delivery codec, and in all honesty, I think it’s going to be WMV. We use a lot of PowerPoint presentations here and WMV seems like the most reliable video file type for it. Any thoughts on this?
Thanks again!
Matt.
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The latest version of Powerpoint (2013) handles H.264 very well, but any version before that probably will like WMV better 🙁
Vince Becquiot
San Francisco Bay Area
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