Tag Archive for 'mplayer'

Usefull Commands: Video

Published 3 years, 4 months ago. 8 Comments Tags: , , , , , , , , , , , , , .
  • Here are some commands to get informations about the nature of a video: 
    mplayer -frames 0 -identify ./video.avi
tcprobe -i ./video.avi
ffmpeg -i ./video.avi
file ./video.avi

Mplayer / Mencoder

  • Change the aspect ratio of a film for the playback. Standard aspect ratio are : 1.33 (4:3), 1.66 (1.66:1), 1.77 (16:9) and 2.35 (2.35:1): 
    mplayer -aspect 2:1 ./video.avi
  • Play the video with subtitles: 
    mplayer -sub ./subtitle_file.txt ./video.avi
  • This will extract audio track no. 128, downmix the AC3 sound to PCM and write the results to file.wav: 
    mplayer -vo null -hardframedrop -aid 128 -ao pcm -aofile file.wav dvd://1
  • This will extract the audio, convert it to PCM and write the resulting wave file to audio.wav: 
    mplayer -vo null -hardframedrop -ao pcm:file=audio.wav myvideo.avi
  • Show all subtitles streams: 
    mplayer -vo null -ao null -frames 0 -v 2 dvd://1 >&1 | grep sid
  • Create a rotated copy of the file.avi video (rotate=1 : clockwise ; rotate=2 : anti-clockwise): 
    mencoder -vop rotate=2 -oac pcm -ovc lavc ./source.avi -o ./dest.avi
  • Preview a video composed of all jpeg files from the current folder at 15fps (mplayer only support jpeg, png, tga and sgi formats): 
    mplayer "mf://*.jpg" -mf fps=15
  • Create a 15fps video from all jpeg files of the current folder: 
    mencoder "mf://*.jpg" -mf fps=15 -ovc lavc -o ./dest.avi
  • Encode a SVCD to AVI file: 
    mencoder -oac lavc -ovc lavc vcd://1 -o ./svcd.avi
  • Transcode video to raw format (be carefull: usually the output video got annoying audio delay): 
    mencoder -oac pcm -ovc raw -ofps 25 -noskip ./video.wmv -o ./video.avi
  • Encode a video using the default mpeg4 codec at 400 kbps for video and mp3 codec at constant 32 kbps bitrate for audio: 
    mencoder -oac mp3lame -lameopts cbr:preset=32 -ovc lavc -lavcopts vbitrate=400 in.avi -o out.avi
  • Enhance the sharpness of the video: 
    mplayer video.avi -vf smartblur=.6:-.5:0,unsharp=l5x5:.8:c5x5:.4
  • Cut a video to keep the first 5.4 seconds: 
    mencoder big-file.avi -ss 0 -endpos 5.4 -ovc copy -oac copy -o cutted.avi
  • Cut a video to keep everything exept the first 5.4 seconds: 
    mencoder big-file.avi -ss 5.4 -ovc copy -oac copy -o cutted.avi
  • Show all mplayer filter list: 
    mplayer -vf help
  • Get help of a particular filter (eq2 in this example): 
    mplayer -vf eq2=help
  • Here is the filter I use to light up a video taken in the dark with my cheap camera. Of course it add noise but thanks to this we can distinguish shapes in the dark. 
    mencoder -vf eq2=1.61:1.95:0.54:2.43 -oac pcm -ovc lavc video.avi -o bright-vid.avi
  • And this is the command to preview the result of the filter used above: 
    mplayer video.avi -vf eq2=1.61:1.95:0.54:2.43
  • This is how I convert raw videos taken with my digital camera into ISO standard MPEG-4 (DivX 5, XVID compatible) videos [to encode in grayscale, add :gray option to -lavcopts]: 
    mencoder source.avi -ovc lavc -oac lavc -ffourcc DX50 -lavcopts vcodec=mpeg4:vbitrate=400:v4mv:mbd=2:trell:autoaspect:dia=2:acodec=mp3:abitrate=32:vpass=1 -vf hqdn3d -o output.avi
mencoder source.avi -ovc lavc -oac lavc -ffourcc DX50 -lavcopts vcodec=mpeg4:vbitrate=400:v4mv:mbd=2:trell:autoaspect:dia=2:acodec=mp3:abitrate=32:vpass=2 -vf hqdn3d -o output.avi
  • Play all videos of the current folder fullscreen at 4x speed with 50% more brightness: 
    mplayer -speed 4 -brightness 50 -fs ./*.avi
  • Extract audio stream from a video: 
    mplayer -dumpaudio -dumpfile audio.ac3 video_source.mpg

Transcode

  • Merge multiple video into one: 
    avimerge -i part1.avi part2.avi -o big-file.avi
  • Extract the raw subtitle stream. The -a 0x21 option correspond to the subtitle stream’s hexadecimal number (= 0×20 + id of the stream): 
    tccat -i /space/st-tng/dic1/ -T 1 -L | tcextract -x ps1 -t vob -a 0x22 > subs-en

Others

  • Extract to chapter.txt the chapter file of the track n°1 of the DVD: 
    dvdxchap -t 1 /mnt/cdrom > chapter.txt
  • Test XV video driver output via gstreamer v0.10: 
    gst-launch-0.10 videotestsrc ! xvimagesink

How to wake up early, the geekest way

Published 3 years, 7 months ago. 1 Comment Tags: , , , , , .

Mobile Phone, Broken Screen I was in a country far far away last month. So far that there was no broadband access (yes, this is possible). Anyway… Generally I use my mobile phone as a clock and as an alarm clock. Unfortunalty I brake it down just before my night flight.

So, to simplify, I was abroad in a hotel, the sun was down since a while, I was tired, and I had to wake up early. No electronic devices to help me, except my laptop… And then came the idea to combine cron and mplayer to automaticcaly play some MP3s at a given time.

Here is how I’ve done it. First, as root, create an empty file in /etc/cron.d/. Let us call it wake-up:

touch /etc/cron.d/wake-up

Then edit it to put the following command:

15 6 * * * root mplayer /home/kevin/music/CoolCavemen/AllCoolHits/*.flac > /dev/null 2>&1 /dev/null

This mean that mplayer will be launched at 6:15 and will play all FLAC files from the /home/kevin/music/CoolCavemen/AllCoolHits/ directory. I let you adapt those parameters to fit your needs.

Random Tips:

  • Take care of time zone (system time and local time are very different).
  • Check that your volume is not muted and crank the volume up !
  • Run the mplayer /home/kevin/music/CoolCavemen/AllCoolHits/*.flac > /dev/null 2>&1 /dev/null command alone in another terminal before you go to sleep to be sure it work (i.e. to check that all sound-related sub-systems are loaded).
  • Be sure that cron deamon is up an running (do a /etc/init.d/crond restart if you are not sure).

HowTo Compile and Use xvidcap

Published 4 years, 8 months ago. 0 Comments Tags: , , , , , , .

Compile gvidcap !

Get the last stable source code archive on xvidcap Sourceforge project page or download it from the CVS:

cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/xvidcap co -P xvidcap

Install required dependencies:

urpmi gcc automake libgtk+2-devel ffmpeg-devel liblame0-devel

Dirty compile:

make distclean [optional]
CPPFLAGS=-I/usr/include/ffmpeg LDFLAGS=-L/usr/bin/ffmpeg
./configure --with-gtk2 --with-forced-embedded-ffmpeg && make gvidcap
make gvidcap
make install [optional]

Quick test:

./src/gvidcap &

Use gvidcap !

Raw capture:

gvidcap --gui no -v --file ~/img_%04d.xwd --frames 0 --fps 10 --cap_geometry 1024x768+0+0

The following can be used but it slow down the machine (png compression require too cpu):

gvidcap --gui no -v --compress 9 --file ~/img_%04d.png --frames 0 --fps 10 --cap_geometry 1024x728+0+0

Convert .xwd images to .png images because mplayer only support .png, .jpg, .tga and .sgi image file format:

convert img_*.xwd img_%04d.png && rm -rf ./*.xwd

Preview the video:

mplayer "mf://*.png" -mf fps=10

Make a video from successive screenshots:

mencoder "mf://*.png" -mf fps=10 -ovc lavc -o ./video.avi

Documentation: