Archive for May, 2010

video #2

Sunday, May 23rd, 2010


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Extract clip from video and convert to a bunch of formats

Sunday, May 23rd, 2010

I’ve been interested in using video for everybody for which you need a .mp4, .ogv and .flv version of your video. To suck out this clip of Cary Grant from Notorious I used mencoder with the following command:

mencoder -endpos 00:00:01.38 -ss 00:05:35 -of lavf -oac mp3lame -lameopts abr:br=56 -srate 22050 -ovc lavc -lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3 notorious.1946.x264.mkv -o cary-grant-eyes.flv

That makes a .flv file of a clip from this movie starting at 5m35 seconds and lasting 1.38 seconds. To convert this to a quicktime compatible .mp4 file I use the following ffmpeg command:

ffmpeg -i cary-grant-eyes.flv -vcodec libx264 -vpre libx264-lossless_max cary-grant-eyes.mp4

Finally to convert that .mp4 file to a firefox compatibly .ogv file I use the following ffmpeg2theora command:

ffmpeg2theora cary-grant-eyes.mp4 -o cary-grant-eyes.ogv

Note: It really seems like I should be able to do each of these straight from mencoder but I couldn’t figure out how.

Update: I think is the right way to do it (losslessly) with ffmpeg

ffmpeg -ss 1:42:11 -i JFK.DirCut.1991.1080p.BluRay.DTS.x264-ESiR.mkv -acodec copy -vcodec copy -t 00:00:02.4 joe-pesci-jfk-honk.mkv

This makes a 2.4 second clip starting from 1:42:11 in the movie JFK:

spain

Thursday, May 20th, 2010

spain map

http://alecjacobson.com/art/digital/
http://alecjacobson.com/art/

Extract mp3 audio from flv flash video

Thursday, May 20th, 2010

Found this resource about using mplayer or ffmpeg to extract the audio of an flv flash movie (like those from youtube etc.) and save it as an mp3 file.

I adapted the ffmpeg version with the -ab flag that allows me to specify audio bitrate:


ffmpeg -i input.flv -f mp3 -ab 192 -vn ouputfile.mp3

Change the 192 to whatever bitrate you want.

video #1

Wednesday, May 19th, 2010


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means nearness

Wednesday, May 19th, 2010

Fourteen new poems:

Means Nearness by Alec Jacobson (PDF).


means nearnes

Download all files of certain extension from website using wget

Monday, May 17th, 2010

Issue this command in a terminal to download all mp3s linked to on a page using wget

wget -r -l1 -H -t1 -nd -N -np -A.mp3 -erobots=off [url of website]

OR if you want to download all linked mp3s from multiple pages then make a text file containing each url on a separate line, then issue:

wget -r -l1 -H -t1 -nd -N -np -A.mp3 -erobots=off -i ~/mp3blogs.txt

If the site is behind basic http authentication you can use something like:

wget --http-user [username] --http-passwd [passwd] -r -l1 -H -t1 -nd -N -np -A.mp3 -erobots=off "[url]"

Things

Monday, May 17th, 2010

Eleven new poems:

Things by Alec Jacobson (PDF).


things cover

bather

Monday, May 17th, 2010

bather

http://alecjacobson.com/art/digital/
http://alecjacobson.com/art/

or maybe yesterday

Friday, May 14th, 2010

or maybe yesterday

http://alecjacobson.com/art/digital/
http://alecjacobson.com/art/