[FFmpeg-user] how to avoid broken pi

[meex]

 > This is not a problem with ffmpeg. You should configure your shell to
 > set the tty to a sane state before a prompt. With zsh, it is done with
 > "ttyctl -f".

thanks for the tip - i've been looking into this and not understanding 
how to accomplish it

for bash the command is stty and it seems the relevant options are:
ixany
ixoff
ixon

what i don't understand is 1) which one(s) to use and 2) how to use them 
in a shell script; should this be near the top of the script so it's 
global, or should these options be enabled/disabled as needed per-command?

Nicolas George wrote:
> meex (12022-01-26):
>> in a bash script i'm using ffmpeg to create a spectrogram movie and pipe the
>> output to a decoder (mpv in this case, but it doesn't matter)
>> 
>> as expected, if the user exits mpv before ffmpeg completes, it returns a
>> broke pipe error and i would like to avoid that if possible
>> 
>> the problem is that the terminal may refuse to accept any user input when
>> this happens (this occurs ~20% of the time)
> 
> This is not a problem with ffmpeg. You should configure your shell to
> set the tty to a sane state before a prompt. With zsh, it is done with
> "ttyctl -f".
> 
>> is there a way to have ffmpeg exit gracefully when the pipe is broken?
> 
> Again, it is not ffmpeg's responsibility:
> 
> Compare:
> 
> ssecem ~ $ sh -c "dmesg" | head -n 1
> [    0.018123] On node 0, zone DMA32: 1580 pages in unavailable ranges
> zsh: exit 141   sh -c "dmesg" |
> zsh: done       head -n 1
> 
> ssecem ~ $ sh -c "trap '' PIPE; dmesg" | head -n 1
> [    0.018123] On node 0, zone DMA32: 1580 pages in unavailable ranges
> dmesg: write error
> zsh: exit 1     sh -c "trap '' PIPE; dmesg" |
> zsh: done       head -n 1
> 
> Regards,
> 
> 
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