This magic app transcodes & drops almost any music or video format onto your iPhone or iPad.
Kirk from Macworld thinks that:
Since the very beginning iPads & iPhones are restricted in the number of file formats they support. You can playback AAC or MP3 music files, as well as ALAC (Apple Lossless), WAV & AIFF, and sure thing you can playback MP4 and M4V video formats. But you can’t enjoy FLAC or MKV, APE, or even AVI. A bunch of 3rd-party apps will let you play these various files, but you will have to manually sync them, either using the file sharing feature in iTunes, or over a network.
This $20 macOS app named WALTR takes all the pain from this tedious process. WALTR does it instead of you, and transfers all the files to your iDevices. Simply drag and drop your files into WALTR’s box, and it will transcode & transfer them in pretty much any format out there. It does not have any settings or preferences, just a box onto which you drag files.
If you are using WALTR, then there is no reason for you to download any 3rd-party apps to play all those unsupported files you transferred. This is due to the fact that this app puts them exactly inside the iOS native Apple Music & TV apps ready for the smoothest playback possible. (Softorino developers say that WALTR fully supports video files in MKV, AVI, MP4, and music files in “WAV, AIFF, AAC, OGG, ALAC, APE, FLAC, CUE, & more.”)
This app works in a really unique way. WALTR’s engineers figured out a way to put files directly to the media folders on iDevices, so the Music and TV apps can see them. From there, since they already have been converted to iOS-compatible formats, you can enjoy them.
Let’s say you want to put a FLAC file onto your iPhone. With WALTR it is as simple as a piece of cake. You just drag it into the app’s window, and it will adapt it into an ALAC music file, with no quality loss for native iOS playback. So, hi-res audio formats are not an issue for this snappy app, just keep in mind that the iDevices themselves are still restricted in terms of the bit depth and sample rate they can handle.
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By Kirk McElhearn, Senior Contributor, Macworld