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?
Seems like there’s some bitrot in the middle of the file, and whatever you’re using to play back the original file just skips it and doesn’t care enough to halt playback. You might try looking for ways to restore as much of the file as possible with something like this, assuming the mkv is a unique copy that you can’t get anywhere else.
Edit: I’m also curious if this file lives on an XFS/BTRFS/ZFS filesystem. The reflink property of these filesystems may be the reason that you can copy within the same folder without it throwing an error.
Yes it lives on BTRFS, I tried a few solutions but some gave this Read error Error demuxing input file 0: Input/output error video1.mkv: Input/output error
and other things i tried said that i dont have hevc support(Yay Fedora) I might be wasting more time than necessary on the file.so i might just give up
What are the results of a scrub on the filesystem? I’m not familiar with BTRFS, but use ZFS, and a scrub is where I would start in your shoes.
I did a scrub and this is what it showed when i ran btrfs scrub status : Duration: 0:17:54 Total to scrub: 63.82GiB Rate: 60.85MiB/s Error summary: read=528 csum=48 Corrected: 570 Uncorrectable: 6 Unverified: 0
Fair enough. I would at least try to get the damaged file off of the disk so you can potentially fix it later, or just have it available to play in its broken state. For the future you should probably be running monthly BTRFS scrubs to detect bitrot sooner, and potentially you should have some backups or data redundancy so you can repair the bitrot when it’s detected.
I did a BTRFS scrub on the partiton and this is what came up
Duration: 0:17:54 Total to scrub: 63.82GiB Rate: 60.85MiB/s Error summary: read=528 csum=48 Corrected: 570 Uncorrectable: 6 Unverified: 0 I dont know what else to do from here
It’s very likely that your disk is failing.
dd if=/path/to/file.mkv of=/new/file/path.mkv conv=noerror,sync bs=4k
Should give you a file with just the damaged bits missing.
Did you try copying it with dd/ddrescue?
Is the copied file going to a usb? Is the usb fake? Otherwise I’m pretty sure your source is bad. Probably the disk sector if you’re sure the file was at some point complete.
Something like btrfs probably does block cloning or similar so a copy to the same disk probably just points at the same disk blocks as the original.
ffmpeg -v error -i file.avi -f null - 2>error.log
Check the source probably
