Currently I am learning a language and I have dialogue MP3 files. Since I am learning it, I want it to have subtitles, because I do not get every detail. To do this, I render these files from MP3 to MP4 and send it to youtube as a video. Video has a black screen. All I do is clicking the CC button. That way youtube will show me AI Generated Subtitles. I will listen and read the subtitles. Wİn - Win.
That being said, I have too many MP3 files. I need to export these Fastest and with the worst video quality. Sound quality should remain same. I have a bad computer so every little detail will make it faster for me to render these.
If you are suggesting me to use an online ocnverter from mp3 to mp4, somehow youtube did not approve them.
That is not correct. It can be DV, but it is not limited to DV.
You are making this too difficult. Pick any low resolution Video Mode including SD PAL. Export using defaults (i.e. either no preset, clicking Export > Reset, or the preset named Default). It is fast, and will be a small size if your video is all black. Beyond that, the next step to try is Export > Advanced > Other, and change preset=fast to preset=ultrafast
Just add your file to the timeline (to a video track, not an audio track).
Select a H264 preset (as suggested by @TimLau ). Next, click the “eye” on the left side of the track to disable video for export.
In export settings select AAC as audio codec, set the file format MP4. Go to the “Other” tab and change the preset to “fast” or “veryfast”. Should work and be relativly quick.
If this doesn’t work for the lack of actual video, you can do this: