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!
ocarolan: I expect he just fell over and rectum.
Aug 4, 2020 12:35:38 GMT
robmc: Well close Keith, I was on roller skates being towed down a hill by my friend on a bike, for extra speed...you can guess the rest
Aug 4, 2020 18:04:31 GMT
robmc: Dinner break over... Roller skates out from under me, 80s short shorts offering little protection, skin removed from half way up my thighs and both cheeks. Disinfectant stung just a wee bit.
Aug 4, 2020 18:44:49 GMT
robmc: And to make it worse, half way through my mother applying the disinfectant, my brother and the girl from next door, who we both liked, came in to see the show.
Aug 4, 2020 18:47:27 GMT
scorpiodog: Rob, you do, you realise, now have to write a song about the incident. With all the embarrassing details.
Aug 5, 2020 11:19:58 GMT
ocarolan: That'll be a cracking song alright!
Aug 5, 2020 11:40:29 GMT
NewDave: Ouch. What hurt more, your pride or your legs?
Aug 5, 2020 12:58:28 GMT
martinrowe: 'Slippin and a Slidin'
Aug 5, 2020 13:18:01 GMT
robmc: I don't know Paul, it's all still pretty raw... Although, how about 'Nevermind the Buttocks'. Dave, legs and bum definitely hurt more than pride, although my pride still hurt!
Aug 5, 2020 21:14:02 GMT
scorpiodog: Yes, Rob. I can see you in a Sex Pistols tribute band. Or you could do a Tony Bennett and use "I scraped my arse and banned machismo".
Aug 6, 2020 10:59:16 GMT
NewDave: Or you could do the Sarah Brightman classic, I lost my arse to a starship trooper.
Aug 6, 2020 17:11:47 GMT
robmc: Interesting suggestions, I'll work on my own magnum opus and simply call it 'Skidmarks'
Aug 6, 2020 22:00:22 GMT
scorpiodog: What? Like "Underpants is theft"? Or "The means of defecation must be in the hands of the proletariat"? Oh, sorry, no. That's Skidmarx.
Aug 7, 2020 9:41:34 GMT
NewDave: Power to the Poop hole?
Aug 7, 2020 14:39:01 GMT