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7th August 2008, 00:13 | #1 | Link |
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Audio delay in MP4?
I can't figure it out. mp4box's --delay never seems to have any effect. I thought maybe I was doing it wrong, so I used meGUI to do it with an obscene delay like 30000ms, but still no dice.
Using mp4box -info on the muxed mp4 doesn't say anything about a delay and the audio duration is always the same. What am I doing it wrong? :\ |
7th August 2008, 03:28 | #3 | Link |
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How would I do that? I need to cut 12ms off it (-12ms delay), but I want to apply the delay/cut it losslessly, or else I would just use Avisynth's DelayAudio ;-;
Also, I don't think players are ignoring it as even mp4box isn't seeing it. I'm probably doing something wrong somehow. |
7th August 2008, 04:18 | #4 | Link |
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That depends on the type of audio. I think AAC can be cut with mp4box.
But 12ms is rather short, so it may not be possible to cut at audio frame boundaries (I think a long AAC frame is 1024 samples, a short one is 128, MP3 is 1152, AC3 is 1536), so maybe it's best to find a way to make delay work, assuming it's actually supported. |
15th August 2008, 06:13 | #10 | Link |
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Oh, thanks, both martino and poisondeathray. I hadn't thought of those
Thanks martino. That worked perfect. This also means I don't have to test the file again on a PS3, since I'm aiming for compatibility Last edited by Comatose; 15th August 2008 at 07:12. |
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