This guide worked 100% for me - it takes you through each step. Afterwards, the m4a file plays! Note: this is completely free. http://sysfrontier.com/en/2014/12/31/hello-world/
Also pasting instructions in case the link goes down in future:
How to fix corrupted voice memo (m4a) files.
Do you have broken voice memo files? You can fix those files by
You could try rewriting the file using ffmpeg with the following command:
ffmpeg -i damagedfile.mp4 -c copy fixedfile.aac
Alternatively you may use FAAD and a hex editor (e.g. Hexplorer). Find out where the actual data starts in a hex editor. Not always after the mdat entry - there may be alot of zeros in the beginning of the file.
Simply copy everything ...
Yeah, that happens eventually. I've been working with SM57s in live and studio setups for 15 years. In particular the ones used in live setups, which are used both indoor and outdoor, wears faster.
I experience reduced gain, loss of low end and "dynamics". This is due to the membrane and edge hardening and dirt/corrosion in the coil hole. There is not much ...
(I'm not sure what you want to fix - it sounds sick and genrewise it is spot on!)
Needless to say: always record with a DI so you have the option to reamp later on if something turns out too hot etc. But at this point this advice is not worth much ;-)
I can think of a few things you might try out:
De-clipping: Try to "restore" clipped areas. De-clipping ...
You need a multimeter to measure the voltage and current.
I assume this XLR pin usage:
1 .. ground
2 .. positive
3 .. negative
If XLR pin usage is different in your setup you will need to switch pins with the pins I describe below accordingly.
Measure Interface and Cable
Do the first measurments directly at the interface XLR port and optionally a second ...
This is a problem that occurred during the original recording. Sounds very much like the tape capstan rubbers are slipping and the tape is not being kept up-to-speed during the recording.
There is only one piece of software that has any hope of fixing this, and it's "Capstan" from Celemony (makers of Melodyne). Make sure you are sitting on a good solid ...
I would also go for a re-recording before any clippy,fuzzy trace of the over-distorted track ruins your overall-mix. And if anything works out with having it re-recorded via DI, you could probably also go for re-amping.
(I don't have much experience with re-amping. A band which shares the studio with us is doing it a lot, because they often switch their ...
Throw those in the bin, unless you want to replace all the drivers.
Anything allowed to get into that state isn't even worth opening to see what may be salvageable.
The cones are free-floating on their own magnets - so the coils are destroyed.
They've been wet, so the cones are destroyed.
I've had this happen before, howevr it was while recording the screen of my computer. Not certain if you've done the same or used a camera IRL. However easiest way to see if there's audio in a file is to play the file in VLC and press CMD+I or CTRL+I (Window>Media Information)
Notice under CODEC Details "Stream 0" & "Stream 1". 0 is your video and 1 is ...
Try opening the file with some advanced video players just to find out if the audio is gone or there's a codec error.
Two video players that I use when having this sort of problems is Quick Time and Video Lan.
If indeed there's no audio attached to the video - there's little to be done - maybe useing a disk data recovery tool depending on the recording ...
Open your headphones.
Strongly resolder your cables.
Add some electric tape around your wire
Close back your headphones.
here are videos that show you how to open Grado SR-60:
I guess this must be close to the way to open the SR-80 model.