Hello! I am happy to provide further details or steps to reproduce, but since you may already be aware I'll try to be brief(-ish).
I am trying to insert a clip at the front of an otherwise complete sequence with many edits. Since .insertClip() does not work like inserting a clip with say, cmd+drop where all tracks are pushed forward in the timeline, I need to use an audio "spacer" to move the audio tracks the exact duration of the png (logo) I am attempting to start the clip with. We do this thousands of times a year at our company.
Trying to set an audio outpoint to match a video outpoint so that their final durations are the same is very difficult because of the following (which I see as bugs).
1)To keep my code more concise, I was using media type 4 for "all" media types on both the video and the audio. This leads, in most cases, to the audio outpoint doing the craziest thing. Instead of being set as instructed, it rounds down to what I call a "detent", based on a mechanical catch, that can be calculated with ((254016000000 * x) * 1.001)/30. Then, when inserted, the end.seconds time rounds down again to the next closest (254016000000 *y)/sequenceFramerate. This means that the duration of an audio file set with the same outpoint as a png will often be 1 or 2 frames shorter than the png on the timeline, moving my audio out of sync. Another side effect is that, since there are only 30 "detents" in a second, you cannot target all frames in framerates above 30, such as 2 seconds and 2 frames at 50fps. Much of that gets solved by simply changing the media type to 2, so there is a viable workaround but it was very time consuming to get to there. That being said, I started messing with additional functions like .clearInPoint(), and I now purposefully use media type 4 at 29.97 and 59.94 on audio files which now gives the desried result. In those framerates, clearing the inpoint first, media type 2 does not work as expected. So I thought I had it figured out for a second, but now I'm a little confused again.
2)The frequencey of the audio files also affects the outpoint and duration of a clip inserted to a timeline, specifically noticed at 23.976fps. If I .insertClip() with a 41.4khz audio file in a 48kz 23.976 sequence, the file will be 1 frame short on the timeline (for testing purposes, you can always assume I am targeting 2 seconds and 2 frames, though I tested up to 4 seconds and 2 frames). This stacks with the media type issue.
Here is the working function below. It works in 23.976, 24, 29.97, 30, 50, 59.94, and 60fps with pngs and movs (that is to say, every combniation of files and framerates I have tested). So it works for me and I'm moving forward, but I wanted to report the behavior. Let me know if you'd like a follow-up!
foo: function () {
var activeSeq = app.project.activeSequence;
var exactSeqFPS = 1 / activeSeq.getSettings().videoFrameRate.seconds;
aPng.setOverrideFrameRate(exactSeqFPS);
var frameNumber = (exactSeqFPS * 2) + 2; //targeting required 2 seconds, plus 2 frames for safety
frameNumber = parseInt(frameNumber.toFixed());
var someTicks = (((frameNumber * ticksPerSecond) / exactSeqFPS)).toString();
aPng.clearInPoint();
aPng.setOutPoint(someTicks, 1);
$.RunScript.pushClipToFrontofSeq(aPng);
},
pushClipToFrontofSeq: function (aProjectItem) { // pushes a clip or still to the front of a sequence and adjusts all existing media
if (aProjectItem.getOutPoint(2).seconds == 0) {
clipHasAudio = false;
} else {
clipHasAudio = true;
}
var activeSeq = app.project.activeSequence;
var exactSeqFPS = 1 / activeSeq.getSettings().videoFrameRate.seconds;
var videoTracks = activeSeq.videoTracks;
var audioTracks = activeSeq.audioTracks;
var audioSpacer = $.RunScript.findOrImportClip("/AUTOMATION_SPACER.aac", "2.AUDIO");
var itemDuration = parseInt(aProjectItem.getOutPoint(1).ticks) - parseInt(aProjectItem.getInPoint(1).ticks);
var someTicks = itemDuration.toString();
audioSpacer.clearInPoint();
var roundedFPS = exactSeqFPS.toFixed(2);
if (roundedFPS == "29.97" || roundedFPS == "59.94") {
mediaType = 4;
} else {
mediaType = 2;
}
audioSpacer.setOutPoint(someTicks, mediaType); //cannot use 4 for audio only, would force "detents"
for (var i = 0; i < audioTracks.numTracks; i++) { // push the spacer to all audio tracks
if (i == 0) {
if (!clipHasAudio) {
audioTracks[i].insertClip(audioSpacer, 0); //push spacer to 0 seconds on track A1
} else {
videoTracks[i].insertClip(aProjectItem, 0); //push the actual file to to 0 seconds on track A1 and V1
}
} else {
if (audioTracks[i].clips[0]) { //push spacer to the first clip of all other audio tracks
audioTracks[i].insertClip(audioSpacer, audioTracks[i].clips[0].start.seconds);
}
}
}
var audioEndPoint = audioTracks[0].clips[0].end.ticks; // could use someTicks again, but this compensates for bugs like "detents"
var videoSpacer = $.RunScript.findOrImportClip("/AUTOMATION_SPACER.png", "STILL");
videoSpacer.clearInPoint();
videoSpacer.setOverrideFrameRate(exactSeqFPS);
videoSpacer.setOutPoint(audioEndPoint, 1);
for (var i = 0; i < videoTracks.numTracks; i++) { //push video the to all video tracks
if (i == 0) {
if (!clipHasAudio) { //if it has audio, we already pushed it
videoTracks[i].insertClip(aProjectItem, 0); //push the actual file to to 0 seconds on track A1 and V1
}
} else {
if (videoTracks[i].clips[0]) {
videoTracks[i].insertClip(videoSpacer, videoTracks[i].clips[0].start.seconds);
}
}
}
for (var i = 1; i < activeSeq.videoTracks.numTracks; i++) { //remove the spacer from all tracks
if (videoTracks[i].clips[0]) {
videoTracks[i].clips[0].remove(false, true); //first is the ripple delete, second is "align to nearest frame"
}
}
if (clipHasAudio) {
var startTrack = 1; //remove the spacer from all tracks except 0
} else {
var startTrack = 0; //remove the spacer from all tracks
}
for (var i = startTrack; i < activeSeq.audioTracks.numTracks; i++) {
if (audioTracks[i].clips[0]) {
audioTracks[i].clips[0].remove(false, true); //first is the ripple delete, second is "align to nearest frame"
}
}
}
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