Merge branch 'sheets' of https://github.com/dufferzafar/chris-cheat into dufferzafar-sheets

* 'sheets' of https://github.com/dufferzafar/chris-cheat:
  New Sheet: ffmpeg - fast audio video encoder
  Git cheats: Shallow clones & Submodule update
  Git cheats: Change date of existing commit
This commit is contained in:
Chris Lane 2015-08-04 20:55:33 -04:00
commit 001fdb0eda
2 changed files with 30 additions and 0 deletions

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cheat/cheatsheets/ffmpeg Normal file
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@ -0,0 +1,12 @@
# Print file metadata etc.
ffmpeg -i path/to/file.ext
# Convert all m4a files to mp3
for f in *.m4a; do ffmpeg -i "$f" -acodec libmp3lame -ab 320k "${f%.m4a}.mp3"; done
# Listen to 10 seconds of audio from a video file
#
# -ss : start time
# -t : seconds to cut
# -autoexit : closes ffplay as soon as the audio finishes
ffmpeg -ss 00:34:24.85 -t 10 -i path/to/file.mp4 -f mp3 pipe:play | ffplay -i pipe:play -autoexit

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@ -22,6 +22,14 @@ git commit --date="`date --date='2 day ago'`"
git commit --date="Jun 13 18:30:25 IST 2015"
# more recent versions of Git also support --date="2 days ago" directly
# To change the date of an existing commit
git filter-branch --env-filter \
'if [ $GIT_COMMIT = 119f9ecf58069b265ab22f1f97d2b648faf932e0 ]
then
export GIT_AUTHOR_DATE="Fri Jan 2 21:38:53 2009 -0800"
export GIT_COMMITTER_DATE="Sat May 19 01:01:01 2007 -0700"
fi'
# To removed staged and working directory changes
git reset --hard
@ -86,3 +94,13 @@ git diff --no-index path/to/file/A path/to/file/B
# To pull changes while overwriting any local commits
git fetch --all
git reset --hard origin/master
# Update all your submodules
git submodule update --init --recursive
# Perform a shallow clone to only get latest commits
# (helps save data when cloning large repos)
git clone --depth 1 <remote-url>
# To unshallow a clone
git pull --unshallow