So I've been recording some videos at home for social media etc, and I've come across an issue...
If I record a video on my iPad, and then try to sync up the audio from my Tascam DR40 in iMovie afterwards it starts off in sync, but then slowly gets out of sync as the video goes on...
I can line up a test clap on the screen and the clap noise on the video audio and the external audio perfectly but, as the video plays from that point you can hear the original and extenal audio gets further apart (it starts off sounding a bit phasey, then eventually it's almost in slapback territory, so the distance between the two sources must be getting more as it goes on)...
I'm recording the tascam audio at 44.1 16 as that's what comes off the ipad video file, initially i thought it might be because i was recording at 48hz on the tascam, but it made no difference swapping between the two..
You need to strip the audio from the video file - don’t know what you are using but most apps do that. You will then end up with 2 ‘file’ - just delete audio and import real audio file.
Which apps are you using?
I'm using iMovie on my macbook... I can strip the audio from the video easily enough, but when I import the external audio and line it up, it slowly starts going out of sync, so if I just used the external audio and removed the original, by the end of the clip it's way off... and the amount it gets off by increases as the video goes on, so it's not as if it's out of sync by the same amount the whole way through the video, it's as if the video is playing faster than the audio...
I'm not hugely experienced in this field, but a few people on my social media have been talking about similar issues recently. I think it sounds like a problem that's coming from the variable frame rate of the iPad camera.
I've done some filming on an iPhone camera recently, but it's all been under 10 min clips and I've not had this issue - but I know people who have had the same issue as you, with 20min+ videos on an iPhone. Sorry that I can't be more helpful!
Well I tried everything - audio at 44.1 and 48, converting the video file to a constant frame rate, even exporting the original audio and lining it up with the external audio in logic and exporting a new file that was exactly the same length - but it just wouldn't stay in sync...
So i bought a usb to lightning adapter (£30!! blimming apple) so i can plug my Tascam dr40x into my iPad and now it works! I can also (through a slightly convoluted system using my grace preamp) plug my Ear trumpet labs edwina in to the tascam and record that to the video on the ipad, so that's the way I'm going now - just filmed a video for an online festival this morning and the sound has come out great.
Thanks leoroberts and ocarolan - it was a bit of a faff getting it all to work together but I didn't want to fork out loads of money but I still wanted to get a good finished video - shame the only space I can get more than 5 minutes peace and quiet is in front of my bedroom wardrobes though!
The iPad is an old iPad mini from 2013 (I think) but the camera on it is okay as long as there's lots of light - so I've got all the lights on in the bedroom (including side lights) and it's the only room in our house that gets a decent amount of natural light where I can also set everything up (the kitchen/conservatory would be best really but I'd never get a moments peace!). The sound from the iPad itself is pretty bad so getting the Edwina to work with it has made a massive difference.
Thanks for the comment on the song too - I've been indulging my Beatles-fan side of late and trying to write songs with middle eights and not being afraid of being a bit catchy! Also in standard tuning which has been a bit of a revelation for me - five new songs and not a detuned string in sight!
martinrowe: There's a Roy Harper tribute song right there.
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ocarolan: When an old whisky drinker leaves the bar...
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robmc: ... and walks straight into the bar on the other side of the road.
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minorkey: Slide is ridiculously fun!
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walkingdecay: The swings aren't bad either.
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walkingdecay: Yep. They would probably take a while to chew up.
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curmudgeon: Watching the run up to F1 Sprint race with subtitles on -Just seen "Mercedes" interpreted as "Miss Sadie's - Well toto - thats the name of your team now!!
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walkingdecay: A few weeks ago I would have agreed that having had a heat pump installed was essentially an act of old hippie wilfulness and that it hadn't been worth the considerable disruption. This morning it feels like it was a very good move.
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martinrowe: 'The Whole Earth Catalog' here we come.
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walkingdecay: Always confused me, that. I can think of fewer more awkward spaces to occupy than a geodesic dome.
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walkingdecay: There, you've got me worrying about people who live in geodesic domes now, and more specifically what must happen when they try to lean a guitar against the wall.
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davewhite: If you had an Ovation - or a lute - you'd probably be OK
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walkingdecay: Or a really big kettle drum, which might even obviate the building itself.(Dome in the sky - I like it.)
Sept 23, 2021 23:04:40 GMT
otis1960: I haven’t had an Ovation since I was 19; they were a lovely audience that night
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