There certainly are conditions where you might not want stderr as part of the output being saved to a file. When I answered this 5 years ago I assumed that the OP only wanted stdout, since he mentioned stdout in the subject of the post.
Go to Open URL and enter http: The same is true of AVI files. You should edit the ffserver. Then install ffserver and ffmpeg, write a script to start them up, and off you go. You can replay video from. However, there are a number of caveats, including the fact that the ffserver parameters must match the original parameters used to record the file.
If they do not, then ffserver deletes the file before recording into it. Now that I write this, it seems broken. You can fiddle with many of the codec choices and encoding parameters, and there are a bunch more parameters that you cannot control.
The reason for this is that the browser often fetches the entire file before starting up the external viewer.
The redirection files are very small and can be transferred quickly. However, ffserver by default starts sending data in realtime. This means that there is a pause of a few seconds while the buffering is being done by the player.
This means that the stream should start 5 seconds in the past — and so the first 5 seconds of the stream are sent as fast as the network will allow. It will then slow down to real time. This noticeably improves the startup experience.
This further reduces the startup delay by not transferring data that will be discarded. It turns out that on my machine at least the number of frames successfully grabbed is marginally less than the number that ought to be grabbed.
This means that the timestamp in the encoded data stream gets behind realtime. Fixing this requires a change in the internals of how timestamps are handled.
Yes subject to the limitation outlined above. Also note that whenever you start ffserver, it deletes the ffm file if any parameters have changedthus wiping out what you had recorded before. The format of the? You use this by adding the?
This allows using, for example: Options which do not take arguments are boolean options, and set the corresponding value to true.
They can be set to false by prefixing the option name with "no". For example using "-nofoo" will set the boolean option with name "foo" to false. Stream specifiers are used to precisely specify which stream s a given option belongs to.
A stream specifier is a string generally appended to the option name and separated from it by a colon. Therefore, it would select the ac3 codec for the second audio stream. A stream specifier can match several streams, so that the option is applied to all of them.
An empty stream specifier matches all streams. For example, -codec copy or -codec: Possible forms of stream specifiers are: Otherwise, it matches all streams of this type. Otherwise, it matches all streams in the [email protected] This is not really related to the question about redirecting output to a file, because it just redirects one stream to another.
2>&1 redirects STDERR to STDOUT, 1>&2 redirects STDOUT to STDERR and 3>&1 would redirect stream 3 to STDERR. A pipe is a form of redirection that is used in Linux and other Unix-like operating systems to send the output of one program to another program for further processing..
Redirection is the transferring of standard output to some other destination, such as another program, a file or a printer, instead of the display monitor (which is its default destination).
command > filename # Redirect command output to a file (overwrite) In PowerShell it is not possible to redirect the output of an entire session (UTF16), if you need a different encoding, use Out-File instead of the redirection operator. Examples. PS C:\> Get-ChildItem c:\windows\system >> . Chapter System and Administrative Commands. The startup and shutdown scripts in /etc/rc.d illustrate the uses (and usefulness) of many of these comands. These are usually invoked by root and used for system maintenance or emergency filesystem repairs. Use with caution, as some of these commands may damage your system if misused. DESCRIPTION. mpv is a media player based on MPlayer and mplayer2. It supports a wide variety of video file formats, audio and video codecs, and subtitle types. Special input URL types are available to read input from a variety of sources other than disk files.
How can I redirect and append both stdout and stderr to a file with Bash? Ask Question. Additionally it will not append to the file but it will overwrite it.
– pabouk May 31 '14 at Correct: How to redirect output to a file and stdout. In PowerShell it is not possible to redirect the output of an entire session (so benjaminpohle.com .
>benjaminpohle.com won't work) however a very similar text output . I'm trying to redirect all output (stdout + stderr) of a DOS command to a single file: C:\>dir 1> benjaminpohle.com 2> benjaminpohle.com The process cannot access the file because it is being used by another pro.
Technically you're not piping, but redirecting output. Looks like you want to use > instead of >>? For obtaining just the last line while ifstat is executing you could extract it in a 2nd file like this: while true; do tail -1 /tmp/benjaminpohle.com > /tmp/benjaminpohle.com; sleep.5; done To overwrite the file each time with out keeping a .