Check if the sound drivers are not very good. If there is, you may need to replace the cable or headphones. Try plugging the cable or headphones into another audio device (like an MP3 player or a CD player) to check if there is still a crackling sound.

Audio cables and connectors can gradually wear with use.

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They can then use those ALSA drivers for high level API development. Besides the sound device drivers, ALSA also bundles a user space driven library for application developers. It replaces the original Open Sound System (OSS).

The Advanced Linux Sound Architecture (ALSA) provides kernel driven sound card drivers.If not, then it is likely the driver, or the audio chip (but more likely the drivers). I might also suggest checking with headphones to see if the sound operates normally with headphones.

You could first try to uninstall / reinstall / Update the audio driver. Does it only do it on YouTube, or with any video/noise? If it does it with all sounds, your speaker needs to be replaced.

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