Videogrep: Difference between revisions
| Line 15: | Line 15: | ||
=== Redirecting stderr to stdout === | === Redirecting stderr to stdout === | ||
2>&1 | ffmpeg's output is actually to the "stderr" and not the stdout. In fact they both appear on the screen -- but the ability to distinguish between these two different "sources" or types of information can be very useful. In this case, we want to erase the distinction so that "errors" are treated like regular output. | ||
ffmpeg -i foo.ogg 2>&1 | |||
[http://www.cyberciti.biz/faq/redirecting-stderr-to-stdout/] | [http://www.cyberciti.biz/faq/redirecting-stderr-to-stdout/] | ||
Revision as of 21:33, 7 October 2010
The idea of this assignment is to familiarize yourself with:
- basic text/code editing in Linux
- commandline basics
- big idea: working in a "pipeline" (both literally, and more metaphorically)
Ingredients
Plain text?
- ISO-8859
- UTF-8
file nameofyourfile.srt
Redirecting stderr to stdout
ffmpeg's output is actually to the "stderr" and not the stdout. In fact they both appear on the screen -- but the ability to distinguish between these two different "sources" or types of information can be very useful. In this case, we want to erase the distinction so that "errors" are treated like regular output.
ffmpeg -i foo.ogg 2>&1
Search & Replace
sed is good for search and replace...
sed s/a/*/g from to