audio voice sync
- Thread starter enrico
- Start date
SMuir
Well-known member
What exactly are you trying to synch?
Were the audio and video recorded on sepperate devices (double system, eg. picture on camcorder, sound on DAT)? Did the audio tracks drift out of synch during the edit? Do you have an in-frame reference (eg. a clap-board or bloop slate)? Do you have a "scratch" audio track to go with the picture? Are you trying to fit ADR or out-takes?
There are many tricks and techniques in a dialogue editor's arsenal, but it really depends on what you're cutting.
Of course, you should start by ensuring that the picture and audio playback from your editing system are themselves staying in synch. If the playback itself is drifting (eg. due to a pulldown mismatch), then you'll never be able to keep things synchronized.
Were the audio and video recorded on sepperate devices (double system, eg. picture on camcorder, sound on DAT)? Did the audio tracks drift out of synch during the edit? Do you have an in-frame reference (eg. a clap-board or bloop slate)? Do you have a "scratch" audio track to go with the picture? Are you trying to fit ADR or out-takes?
There are many tricks and techniques in a dialogue editor's arsenal, but it really depends on what you're cutting.
Of course, you should start by ensuring that the picture and audio playback from your editing system are themselves staying in synch. If the playback itself is drifting (eg. due to a pulldown mismatch), then you'll never be able to keep things synchronized.
The audio tracks drifted out during the edit, and I'm trying to re match them back together. It may have unlocked due to a pulldown mismatch. Is there any way to check if that's what happened and make necessary corrections?
I'm finding that even with headphones, when I sync up clear edged voice sounds slowly exactly, then I play it back and the track seems even more off than when I just eye it generally together in real time.
Is this an indication of pulldown mismatch? If it is, then I have a feature film's worth of corrections in front of me.
please help.
I'm finding that even with headphones, when I sync up clear edged voice sounds slowly exactly, then I play it back and the track seems even more off than when I just eye it generally together in real time.
Is this an indication of pulldown mismatch? If it is, then I have a feature film's worth of corrections in front of me.
please help.
Last edited:
SMuir
Well-known member
There are a few ways to do this. Eyeballing it probably isn't the best approach, though, especially if you're new to dialogue/ADR editing.
If you're working with single-system sound, then the audio and video source clips should have matching start times. Simply re-build your edit from the EDL, keeping the audio and video regions locked. If you're software won't let you do this automatically, then you could be in for a lot of work. Nonetheless, you won't find yourself continually second-guessing the synch the way you are now.
Even if you don't have access to EDLs, you should have some way of determining the in and out point of the existing clips and exactly rebuilding that (with audio) on a second timeline.
Double-system sound can be a bit tricker, since your picture and audio source clips may not share the same start-time. If dialogue was recorded on a timecode recorder, you can use that as a synch reference for a dialogue conform. Otherwise, you may have to synch each clip individually the long way: copy each clip (without moving it) onto an unused track, pull out the start of the clip (or the end if it was tail-slated) until you find the slate, then cut in the appropriate audio clip on a temp audio track using the slate as a reference point. Trim the audio clip to match the in and out point of the original video, and drop it into the corresponding audio track (without moving it in time). Clear out those temp tracks, and move on to the next clip.
Mechanically synching or conforming your audio can be time-consuming, but it tends to be more accurate and way less stressful.
If you're working with single-system sound, then the audio and video source clips should have matching start times. Simply re-build your edit from the EDL, keeping the audio and video regions locked. If you're software won't let you do this automatically, then you could be in for a lot of work. Nonetheless, you won't find yourself continually second-guessing the synch the way you are now.
Even if you don't have access to EDLs, you should have some way of determining the in and out point of the existing clips and exactly rebuilding that (with audio) on a second timeline.
Double-system sound can be a bit tricker, since your picture and audio source clips may not share the same start-time. If dialogue was recorded on a timecode recorder, you can use that as a synch reference for a dialogue conform. Otherwise, you may have to synch each clip individually the long way: copy each clip (without moving it) onto an unused track, pull out the start of the clip (or the end if it was tail-slated) until you find the slate, then cut in the appropriate audio clip on a temp audio track using the slate as a reference point. Trim the audio clip to match the in and out point of the original video, and drop it into the corresponding audio track (without moving it in time). Clear out those temp tracks, and move on to the next clip.
Mechanically synching or conforming your audio can be time-consuming, but it tends to be more accurate and way less stressful.
The sound edit (single system) I'm working with is a result of having exported an EDL for sound editors who didn't synch the voice tracks consistently, so I'm now trying do it manually.
For some reason though, it seems the playback isn't corresponding exactly, or lining up with what I thought I synched (slowly). Could this possibly be a pulldown mismatch (can I check that?) or just something I'm doing wrong?
Your feedback is much appreciated,
enrico
For some reason though, it seems the playback isn't corresponding exactly, or lining up with what I thought I synched (slowly). Could this possibly be a pulldown mismatch (can I check that?) or just something I'm doing wrong?
Your feedback is much appreciated,
enrico
SMuir
Well-known member
Sample rate Pulldowns are used when footage is shot at one frame rate (eg. 24 fps film with 30fps audio) and post-production occurs in a different frame rate (eg. 29.97 fps video and audio). If your film is being post-ed in the same frame-rate in which it was shot, pulldown shouldn't be an issue. 29.97 fps and 23.976 fps are effectively equivalent, in this case.
Depending on your software, the presence or absence of a pullup/down should be found somewhere in your timeline setup or preferences (usually in whith timeline video format and audio sample rate).
Can you import the guide audio from your earlier picture edit as a reference?
Another thing to check is that the 2-beep and/or tail-pop are precisely located. If their location has drifted between the picture and sound editing stages, you may be able to get to the bottom of the problem at hand.
Of course, the dialogue editor should be helping you get to the bottom of this. If the dialogue was in-synch in their system, its in their best interest to ensure that the synch stays rock-solid right through to the final print-master. If the synch was loose in their system, they should be fixing it on their time. "Out of sych, out of work" as they say.
Depending on your software, the presence or absence of a pullup/down should be found somewhere in your timeline setup or preferences (usually in whith timeline video format and audio sample rate).
Can you import the guide audio from your earlier picture edit as a reference?
Another thing to check is that the 2-beep and/or tail-pop are precisely located. If their location has drifted between the picture and sound editing stages, you may be able to get to the bottom of the problem at hand.
Of course, the dialogue editor should be helping you get to the bottom of this. If the dialogue was in-synch in their system, its in their best interest to ensure that the synch stays rock-solid right through to the final print-master. If the synch was loose in their system, they should be fixing it on their time. "Out of sych, out of work" as they say.
The film footage was actually shot in 24p advanced with DVX100b. Does that mean the audio has been exported at 29.97?
For the edit, the capture preset DV NTSC 48 kHz Advanced pulldown (2:3:3:2) Pulldown Removal.
For some reason, early on in the edit, the audio and video became unmatched in the viewer.
When I scrub slowly over the timeline (manually), it doesn't seem to be lining up the same as in playback. Is this an indication of something definite?
I'm doing this myself now due to budget restraints, otherwise I would be most happy to turn this over to more experienced hands.
Your feedback's very helpful at this time.
For the edit, the capture preset DV NTSC 48 kHz Advanced pulldown (2:3:3:2) Pulldown Removal.
For some reason, early on in the edit, the audio and video became unmatched in the viewer.
When I scrub slowly over the timeline (manually), it doesn't seem to be lining up the same as in playback. Is this an indication of something definite?
I'm doing this myself now due to budget restraints, otherwise I would be most happy to turn this over to more experienced hands.
Your feedback's very helpful at this time.