this post was submitted on 01 Nov 2023
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Weird error copying MKV file (lemmy.ml)
submitted 1 year ago by Artemis_Mystique@lemmy.ml to c/linux@lemmy.ml
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I have some locally stored media i was copying between drives and one mkv file gave this error error reading 'video1.mkv': Input/output error and only copied 176/256 MiB; the copied file plays the video only up to a certain point before abruptly closing; I can play the original file fine albeit there is a noticeable hitch at that point but the video plays normally till the end I have tried zipping the file but it fails to zip it I tried copying it using ffmpeg but it also gave the same error I can copy the file in the same directory but trying to copy the copy also gives the same error I tried copying to a variety of different storage drives and it still gave me this error any ideas?

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[–] yote_zip@pawb.social 4 points 1 year ago (1 children)

Okay cool. I would be wary of that drive just in case, and I would definitely schedule weekly SMART short tests and monthly BTRFS scrubs on it if you go with BTRFS in the future. EXT4/XFS/etc do not have a concept of data checksums, which means they can't scrub and check for bitrot - this might be problematic if you find that your disk starts causing bitrot because you won't know where it's happening.

I follow Backblaze's rules on detecting impending drive failure:

  • SMART 5: Reallocated_Sector_Count.
  • SMART 187: Reported_Uncorrectable_Errors.
  • SMART 188: Command_Timeout.
  • SMART 197: Current_Pending_Sector_Count.
  • SMART 198: Offline_Uncorrectable.

If any of these SMART metrics are higher than 0 I'd expect failure soon and take precautions.

[–] Artemis_Mystique@lemmy.ml 1 points 1 year ago (1 children)

Thank you Id 197 and 198 reported 5 & 6 respectively(bad sectors decreased from 6 to 5), Is it possible to copy a file non sequentially; say back to front so i can just join those 2 parts together?

[–] yote_zip@pawb.social 2 points 1 year ago (1 children)

Try this answer. I guarantee there is a way to read the file front to back while skipping errors, but I run so much data redundancy that I don't have any experience with it.