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Hello,
My app creates footage for import into FCP. I'm running into an issue with FCP silencing the first 15-30 frames of the clip audio. The waveform is flatlined and playback is silent. The same mov has audio from the start in QuickTime Player or any other QT app. I've managed to track the source of the problem down to movies with edit lists that push the audio out slightly to maintain sync.
To explain, files created using
InsertMediaIntoTrack( soundTrack, x, y, duration, fixed1 );
work fine for x == 0.
exhibit this problem for x > 0.
The difference in the resulting files can be seen in the elst atom in the mov. Those with audio tracks containing 1 entry with segment duration > 1 and mediatime of 0 work. Those with 2 entries, 1 being segment duration > 1, mediatime of -1, followed by segment duration > 1 and mediatime of 0 do not.
(it should be said duration of the silence is something < 1 or 2 frames as seen in QTplayer etc, FCP is not merely extending this edit, since playback is in sync just starts late)
This seems to be recommended way to pad the head of an audio track with no noise, according to all the old generation QT docs. Is this a bug in FCP? Are we supposed to be doing our own zeroed samples nowadays rather than using -1 mediatime edits?
mike
--
Mike Woodworth
mikelists(a)divergentmedia.com
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