ffmpeg commands are all structured in a specific and standardized way
a few bits from the description on the man page
ffmpeg [global_options] {[input_file_options] -i input_url} ...
{[output_file_options] output_url} ...
ffmpeg reads from an arbitrary number of input "files" (which can be regular
files, pipes, network streams, grabbing devices, etc.), specified by the "-i"
option, and writes to an arbitrary number of output
"files", which are specified by a plain output url. Anything found on the
command line which cannot be interpreted as an option is considered to be an
output url.
Each input or output url can, in principle, contain any number of streams of
different types (video/audio/subtitle/attachment/data). The allowed number
and/or types of streams may be limited by the container
format. Selecting which streams from which inputs will go into which output is
either done automatically or with the "-map" option (see the Stream selection
chapter).
To refer to input files in options, you must use their indices (0-based). E.g.
the first input file is 0, the second is 1, etc. Similarly, streams within a
file are referred to by their indices. E.g. "2:3"
refers to the fourth stream in the third input file. Also see the Stream
specifiers chapter.
As a general rule, options are applied to the next specified file. Therefore,
order is important, and you can have the same option on the command line
multiple times. Each occurrence is then applied to the
next input or output file. Exceptions from this rule are the global options
(e.g. verbosity level), which should be specified first.
Do not mix input and output files -- first specify all input files, then all
output files. Also do not mix options which belong to different files. All
options apply ONLY to the next input or output file and
are reset between files.
in your example
> $ ffmpeg -i input.mp4 [...] -yo output.mov
ffmpeg -i input.mp4 [..] output.mov
works just fine no need to add -y because .mov is a different filename
> $ ffmpeg -yo output.mov -i input.mp4 [...]
is incorrect structure for ffmpeg...
> The order shouldn't overly matter
it matters... see above
> On Oct 11, 2017, at 8:39 06AM, Douglas Marsh <[email protected]> wrote:
>
> On 2017-10-10 18:18, Mikhail V wrote:
>> James Girotti wrote:
>> Sure, I am. But anybody can miss the typo, and its not so easy to
>> notice in console or text editor, its just two chars
>> in a pile of chars.
>
>
> Perhaps then add a new switch.. something *like*
>
> $ ffmpeg -i input.mp4 [...] -yo output.mov
>
>
> (for "Yes Output/Overwrite" where the parameter that MUST come next is the
> filename)
>
> and the following example would NOT work:
>
> $ ffmpeg -yo -i input/mp4 [...] output.mov
>
> as -yo has no parameter [the filename to overwrite] and assuming "output.mov"
> exist so it would not overwrite without prompt. The order shouldn't overly
> matter as the following COULD work:
>
> $ ffmpeg -yo output.mov -i input.mp4 [...]
>
>
> Just an idea.
>
>
> --Doug (dx9s)
> _______________________________________________
> ffmpeg-user mailing list
> [email protected]
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> [email protected] with subject "unsubscribe".
_______________________________________________
ffmpeg-user mailing list
[email protected]
http://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
[email protected] with subject "unsubscribe".
