ffmpeg fails with: Unable to find a suitable output format for 'pipe:'
69,817
typo
Use -preset
, not - preset
(notice the space). ffmpeg
uses -
to indicate a pipe, so your typo is being interpreted as a piped output.
pipe requires the -f
option
For users who get the same error, but actually want to output via a pipe, you have to tell ffmpeg
which muxer the pipe should use.
Do this with the -f
output option. Examples: -f mpegts
, -f nut
, -f wav
, -f matroska
. Which one to use depends on your video/audio formats and your particular use case.
You can see a list of muxers with ffmpeg -muxers
(not all muxers can be used with pipe).
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Author by
llogan
Updated on July 23, 2022Comments
-
llogan almost 2 years
I am trying to record my desktop and save it as videos but ffmpeg fails.
Here is the terminal output:
$ ffmpeg -f alsa -i pulse -r 30 -s 1366x768 -f x11grab -i :0.0 -vcodec libx264 - preset ultrafast -crf 0 -y screencast.mp4 ... Unable to find a suitable output format for 'pipe:'
-
Ulterior about 10 yearsadd
-f mp4
just before filename and move-r 30 -s 1366x768
before -vcodec -
llogan about 10 years@Ulterior That will result in x11grab using default settings (
-r 25 -s 648x480
), so your suggestion of changing these options from input options to output options will cause frame duplication (25 to 30) and upscaling (640x480 to 1366x768).-f mp4
is superfluous in this case.
-
-
mojuba almost 3 yearsJust to point out, the order of options is important too. E.g. your
-f mp3
should come after the-i
parameter.