I was playing in my survival world while listening to music, when my computer started to crash, I had time to close my world, but it stayed in the "saving world" screen. Then, I couldn't do anything, so I turned off my computer pushing the on/off button. When I turned my computer on and tried to play again, I couldn't select my world, but it is in my .minecraft file.
I can't upload it because it says that the limit are 10mb.
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I tried everything to recover it, but it seems that the level.dat is corrupted so I can't use it to find my seed in order to recover my world following the steps you mentioned.
https://www.dropbox.com/s/ggt7weeeyyzgr49/Survival%201_16.rar?dl=0
that is my world
I also have lost a world
When I was mining the blocks dissapeared and were not being picked up. The program skipped backwards to a previous time ( a few seconds ) filling the section I had mined in when I continued mining I came to the same section that i had mined before the skip back.
When I went to save the game It froze my PC have had this happen twice. Have had to power down and restart everything.

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Please try to recover the world using these in structions: https://minecraft.gamepedia.com/Tutorials/Recover_corrupted_saved_world_data
Please also provide the world download by hosting it on a different website, such as Dropbox.
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📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki