- 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.avivideo (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
mplayerfilter list:mplayer -vf help
- Get help of a particular filter (
eq2in 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
:grayoption 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
FFmpeg
- Concatenate a series of videos and transcode the audio output to a
flacfile. This only works with certain multimedia container (MPEG-1, MPEG-2 PS, DV):cat M2U01802.MPG M2U01803.MPG M2U01804.MPG | ffmpeg -i - -acodec flac output.flac
- Remove the first 16 seconds of video and change container to Matroska:
ffmpeg -ss 16 -i ./MVI_8763.MOV -vcodec copy -acodec copy ./MVI_8763.mkv
- Extract the first frame of a video (great to generate image preview):
ffmpeg -i video.mov -r 1 -t 00:00:01 -f image2 images%05d.png
- Transcode the video stream to the lossless HuffYUV codec:
ffmpeg -i ./MVI_1714.MOV -vcodec huffyuv -sameq ./MVI_1714-lossless.avi
Transcode
- Merge multiple video into one:
avimerge -i part1.avi part2.avi -o big-file.avi
- Extract the raw subtitle stream. The
-a 0x21option 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
VLC
- Transcode the first video stream found in a
m3uplaylist to a 384 kbps MPEG-2 video and 48 kHz Vorbis audio, and serve the resulting stream ina Ogg container tohttp://localhost:8888. To save bandwisth we reduce by two the size of the video:vlc -vvv http://mafreebox.freebox.fr/freeboxtv/playlist.m3u --sout '#transcode{vcodec=mp2v,vb=384,scale=0.5,acodec=vorbis,ab=48,channels=1}:standard{access=http,mux=ogg,url=:8888}' -I ncurses 2> /dev/null
Others
- Extract to
chapter.txtthe 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