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audio issue
Here are the facts:
I’ve brought a 152MB MPEG movie that contains both audio and video into a new AE 7.0 comp. I’ve layered 2 small PNG files on top of it and want to render it out as a Quick Time.
Problems (in order of importance):
1. The audio stutters on playback. (Sometime it’s barely
noticeable, other times it’s more like a pause than a stutter)2. I get better results using the render que than just exporting,
however when using the que, my 8 minute video takes 2.5 hours
to render, and my 152MB file jumps upto 3 GB.3. I’m rendering at 1280 x 768. That’s what it says in the comp
settings, and that’s what it says it is in the QT video info.
However, my screen is that size, and I know that something is
off somewhere because the QT player doesn’t fill the screen.What I’ve tried and other info:
Exporting as MPEG, AVI, QT, (which is what I really want), and
even just the audio as a WAV.I’ve tried every compressor listed, Sorenson, H.261, MPEG, etc…
The file plays back fine on it’s own (pre-AE), and plays back
fine in program with a RAM preview.The frame rates are the same – I’ve double checked.
I’ve tried rendering on 3 different PCs, so I don’t think it’s a
Hardware issue.Any help would be appreciated! The audio issue is the main problem, but they all need to be fixed.
Thanks! -
6 Replies
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First, you need to commit to a specific codec and frame size for a specific purpose.
– Where is the rendered movie going? An editing app? A compressor for MPEG-2?
– What is the final playback medium? Web? DVD? Tape? Your hard drive? Somebody else’s hard drive?
Please be specific.1. If the audio stutters on playback, your data rate may be too high for the hard drive to play. Does it stutter in a RAM preview?
Also, AE doesn’t like importing highly-compressed movies. Try using QT Player to convert the movie to Animation codec or Photo-JPEG Quicktime, then import into AE.
Why are you using 1280×768? That’s very large. Please explain why you want to make a movie that size.2. Only export when you have to. Otherwise, use the Queue. 2.5 hours may or may not be a big deal for an 8-minute video — it depends on your effects. The file size is because you are making an 8-minute 1280×768 file, probably using a low-compression codec.
3. It sounds as if you just dropped the thing into AE. QT’s size indication doesn’t always help. Once again, you need to commit yourself to a specific size, purpose and codec for your video before we can help you,
So … let us know.
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your audio issues may be due to an audio rate mismatch. the rendered audio rate needs to match the original audio rate. this audio was part of the movie, correct? it isn’t an added mp3 (ae doesn’t seem to work well with mp3s).
your file size will get very large if you render to a lossless (default) or uncompressed format. your final destination for the file will help decide what other codec you might want to choose. generally you waould like to render out losslessly, then compress as the final step, but that can be adjusted if you know what codec you will need int the end.
the render time seems long for just two overlayed images, so i think something else may be going on.
the frame size seems a bit odd 1280×720 would be a normal hd size. have you checked the frame size in ae… select the footage in the project window and next to the thumbnail at the top it should give your the size, duration and frame rate. again knowing your destination would help decide if you needed to make the file conform to normal hd.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW -
I tried using the audio and video seperately, but it didn’t work out. The audio problem still exists. Of course I have to use AE to render the audio out as a WAV because that’s all that’s available to me here at work. Do you know of another way to change the MPEG file and seperate out the audio? (That doesn’t require buying another program?)
Thanks -
Okay, I’m committed to using Sorenson 3 and rendering as a QT movie. That’s my goal and I’m sticking to it! ;p
The final product will be used on a HD touch-screen application. Just how the specific app works, I don’t know…I’m just the graphics person. All I know is that I’ve been told to render the file as a QT and to make the size 1280 x 768. I’m new to the job and I do what I’m told.
The file does not stutter in a RAM preview, but I don’t think that data rate is the issue since files that are much larger (bothe physically and file size)have played back fine.
Thanks. -
I agree that it sounds like an audio rate mismatch. (Yes, the audio was part of the original movie.) I see clearly that the frame rates are the same….how can I tell what the audio rate was/is?
My bosses would most like me to use Sorrenson 3 and render as a QT file for the sake of thier HD touch-screen app. That’s also the reason for the frame size. It’s specific for what this company does.
Thanks, Kevin.
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qt ‘get movie info’ may give you the audio rate. but i think you may be best off separating the audio like dave suggested. especially since you’re not seeing any other render issues.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW
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