YouTube to MP3 converters are designed for desktop, and mobile devices not smart TVs. Converting a video file from one format to another is not within the capabilities of smart TV operating systems like Android TV, Tizen, or webOS. Unlike the web browser and app stores of PCs or smartphones, smart TVs offer a more limited environment focused primarily on streaming media rather than general function.
Smart TVs do have built-in browsers that can take care of some common web-surfing you need but usually it is not capable to pull off more complex tasks, such as converting YouTube clips into MP3 format. The CPU and RAM specs on these devices skew towards video playback than all out multitasking. As soon as heavy duty processes like file conversion come into the picture, they just can't be handled by top models of TVs that have high quality processors fined tuned for 4K streaming (e.g. LG's OLED TV).
When users try to use a web-based YouTube to MP3 converter on the browser of their smart TV, they often experience compatibility issue. If the interface just doesn't load properly or the download function is restricted by operating system of TV. In a 2023 survey related to smart TV, users mentioned that converters do not run on their TVs more than no less of 5 and this is really nothing but an upwardly scale up in numbers for the limitations imposed.
For this, the easiest solution be to convert that file on smartphone – tablet or pc, and save it as MP3 format then transfer it back smart TV. And it comes with a range of content that can be loaded onto an external HDD or storage device, offering multiple ways to connect; USB storage, network sharing or Bluetooth (depending on the TV model) – so you endless hours worth of 4K and HDR movies. As an example USB transfer is Pixar and used by almost all smart TVs nowadays in a range of 20MB/s to even up around the limit because any TV with a standard you are probably already owning has some ports so what easy for Plug & Play then how much faster?
Apps such as Plex or Kodi are other methods to stream your newly formatted MP3 files straight from a media server over to the smart TV. It sounds like this obviates direct file handling on the TV box itself, relying instead in networked storage solutions. With every-OS support from iOS/ Android, Mac OS X and Windows read/write capabilities of exFAT drives; industry experts advise this among users with extensive audio libraries.
To sum up, it is not possible to use a youtube-to-mp3 converter directly on smart TV. The best way to enjoying MP3 content on smart TVs is still converting such kind of files in a more competent device other than a TV and transferring the resulting videos; thereby taking advantage of better audio quality bytes or storage place that can be made accessible.