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Adobe Media Encoder and FlipHD footage glitch
Wasn’t sure where to post this, so please point me in the right direction if this is the incorrect forum.
We have some staff that have been using a Flip HD camcorder recently to do some basic field filming. If they give me the mp4 file, I can convert it to whatever using AME without any issue. The Flip cameras have a feature that allows the user to add music to a video clip by just using the built in (actually in the camera for anyone unfamiliar with the device) editing software, then output an mp4 file. I’m finding that the clips with music added, when loaded into AME, double in length. The clips that are straight from the camera without music have no problems. The music seems to play at normal speed after encoding, however the video is playing at half speed. When looking at the preview window inside AME, the length on the timeline reads as double. Note that the mp4 file plays without any problems before loading it into AME. Anyone have any thoughts?
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6 Replies
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What are the specs on the MP4 with music when it comes out of the FlipHD and what are the settings you are using to attempt to re-encode?
-Andrew Saliga
Steelehouse Productions
http://www.steelehouse.com (undergoing a much-needed redesign)
http://www.vimeo.com/steelehouse -
The mp4 file from the camera is 1280×720, 30fps, total bitrate of 9192kbps for video, audio is stereo 44K, 256kbps and it’s 1:56 in length. It doesn’t matter what settings I choose in AME, it keeps telling me in the preview window (see pic) that it’s 3:57 in length, and after encoding, that’s how long the exported file is. Again, this is only with the file that has music added. The musicless file is fine.
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That’s odd. What happens if you try to encode the video with music using another preset? I’m just trying to figure out if it’s actually the addition of the music that’s causing the issue or the output settings.
Also, does the duration literally double? You’re saying that video is basically being converted into slow motion?
Why not add the music in post rather than in camera?
-Andrew Saliga
Steelehouse Productions
http://www.steelehouse.com (undergoing a much-needed redesign)
http://www.vimeo.com/steelehouse -
Sorry, let me clarify a bit. These videos are being shot by another department for them to use on their blog. I just happen to be doing them a favor by compressing the videos so they fit in the upload requirements. I’m not filming, editing, or anything else. I agree adding the music in post would be best, but there really isn’t any post. They’re trying to use the built in music addition because they don’t have an editor on staff or any way to edit at all. I just figured it’d only take a minute to drop it in AME, compress it to the right size, then hand it back to them.
The video doubles in length, but the audio stays the same. The output file size is 3:57 instead of 1:56. The only thought I’ve had is that if the original music file is longer than the video clip and perhaps AME can see the whole length of the music (embedded data?) and pulls it out, but the way the Flip camera encodes the original mp4 file it tells media players to ignore that data. Does that make any sense?
I’ll ask them to bring me the camera so I can see if there are different output settings. The files without music have no problem at all.
Thanks for trying to help me figure this out!
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I think that makes sense. So is the video duration actually getting longer or is black being added at the end?
-Andrew Saliga
Steelehouse Productions
http://www.steelehouse.com (undergoing a much-needed redesign)
http://www.vimeo.com/steelehouse -
The video is being slowed down to extend the length. No extra black. It’s only extending the video. The music stays the same length, and fades out at the correct time (1:56), but clearly the original song file is longer, I just don’t know how long. Then it’s just silence over 50% speed video until the end (3:57). I’ll post back once I get the camera in hand and can see what other info I can pull.
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