[FFmpeg-user] feature proposal - avoid overwriting the input file
james.girotti at gmail.com
Wed Oct 11 03:12:57 EEST 2017
On Tue, Oct 10, 2017 at 4:40 PM, Mikhail V <mikhailwas at gmail.com> wrote:
> Currently it is possible to delete the input file if I specify same
> filename in output,
> for example:
> ffmpeg -y -i input input
Aren't you specifying that with '-y' you want to "overwrite output file
> or simply:
> ffmpeg -i input input
> (this will promt y/n)
I believe this is the default behavior for any output file that is present
whether it matches input or not (in my example both foo.mkv and bar.mkv
ffmpeg -i foo.mkv bar.mkv
Input #0, matroska,webm, from 'foo.mkv':
ENCODER : Lavf57.71.100
Duration: 01:00:30.05, start: 0.000000, bitrate: 5195 kb/s
Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1920x1080 [SAR
1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
ENCODER : Lavc57.89.100 h264_nvenc
DURATION : 01:00:30.047000000
Stream #0:1: Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
ENCODER : Lavc57.89.100 aac
DURATION : 01:00:30.021000000
File 'bar.mkv' already exists. Overwrite ? [y/N]
> So this will immideately destroy the input file.
> It did not happened with me often, but still happened a pair of times.
That is why almost never user '-y' and only if I am 100% certain it is
safe. Which in my case are FIFOs
> Was quite funny actually :) Funniest thing that I could not recover the
> because it is same name.
That reminds me of when I accidentally did 'rm -rf /*'
> So, it would be nice if ffmpeg compare the output path with all input paths
> and exit with an error.
Is it possible for you to run your command without '-y' or if you're using
a script, then to compare your input and output before passing them to
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