Audio not working on all devices

[KhylaJade91]

Okay so I have put together a wedding film with vows over music in 2 places during the film. Now once exported on playback on the computer it plays absolutely fine however when I transfer the film to a USB and put it into the tv to watch the music plays perfect but no vows?? Anyone know how to help with this situation?

[Richard M Knight]

Might well be this:

audio missing on vimeo and youtube

[SAFEHARBOR11]

As noted in thread that Richard linked, apply either the FILL LEFT or FILL RIGHT effect to the vows audio track and then export again, that should fix it

Thanks

Jeff

[excited_Genie16B8]

playback on the computer it plays absolutely fine

I'm skeptical of that.

Audio Phase: Why You Need To Pay Attention To This - YouTube

[KhylaJade91]

Right mate.. Cheers for the helpful reply. Not sure why I would lie... Also uploaded to Facebook & Instagram they play back perfect with vows included just not on my TV from USB however the replies above have since changed that and all seems to be fine now. So cheers again for your not so helpful reply

[excited_Genie16B8]

I'm not suggesting you lied.  I'm saying if the issue was a phase problem, then the playback on the computer wasn't "fine".  Out-of-phase audio is very obvious.  Even if you don't yet understand the cause, one can still hear that something is wrong.

[SAFEHARBOR11]

My suggestion for anyone editing video, professional or hobby, is to have a STEREO desktop speaker system on the desk in front of you, with speakers positioned to left and right of monitor. Then it will be quite obvious if there is a dead channel or any other weirdness during editing. Not a "surround" speaker system with a subwoofer and such, just TWO SPEAKERS (unless you are specifically working on 5.1 but I think stereo will suffice for 99% of users).

Thanks

Jeff

EDIT: My understanding of the out-of-phase audio is that when played through speakers, the sound waves of the two channels will cancel one another out in the air. Meaning there IS sound coming out of each speaker, but we actually hear silence due to the cancellation! Now, if you listen to the same audio with headphones, the left and right channels are isolated into your ears and therefore the sound waves do not cancel each other out and you will hear the sounds. So if editing with headphones you would not know there is any issue. Or editing with a mono speaker.

And then what happens with mobile device playback is the phone will have a mono speaker, so the stereo channels are combined into mono and this again allows the L and R signals to cancel each other out but electronically (before coming out the speaker) rather than cancelling in the air. Like if you add +1 and -1 you get zero.