Convert (multimedia files)

Image Files
Audio Files
Video Files

Image Files

Resize Images to a maximum resolution

convert "YourOldPicture.jpg" -resize 1600x1600 "YourNewPicture.jpg"

Create a Black-and-white picture and compress it

djpeg "YourOldPicture.jpg" | ppmtopgm | cjpeg -qual 70 >"YourNewPicture.jpg"

Rename Pictures

rename -n ’s/\.jpg$/\.JPG/’ *.jpg

Audio Files

flac2mp3

ffmpeg -i file.flac -ab 320k -ac 2 file.mp3

Normalize Audio

mp3gain -a *.mp3

Merge mp3 audio files into one

mp3wrap merged.mp3 one.mp3 two.mp3

Fade in/out audio filter

details see here: https://ffmpeg.org/ffmpeg-filters.html#afade

Fade in first 15 seconds of audio

ffmpeg [...] -afade=t=in:ss=0:d=15 [...]

Fade out last 25 seconds of a 900 seconds audio

ffmpeg [...] -afade=t=out:ss=875:d=25 [...]

You can also try sox
The next command will:

trim out from Position 45 sec. the next 30 seconds (0:45.0 30) and
fade the first 5 seconds (0:5) and the last 5 seconds (0 0:5) and
convert from wav to mp3

sox infile.wav outfile.mp3 trim 0:45.0 30 fade h 0:5 0 0:5

Cut / crop audio

You can also try sox (see above) which strips, fades in and out in one command.
To strip the 1st 30 sec. of an audio file using ffmpeg do

ffmpeg -ss 30 -acodec copy -i inputfile.mp3 outputfile.mp3

To get the first 30 seconds only do:

ffmpeg -t 30 -acodec copy -i inputfile.mp3 outputfile.mp3

wav2mp3

Convert all *.wav-files in a folder to mp3-files and move mp3’s to ‘mp3’ sub-folder

for i in *.wav; do 
   lame "$i" "${i%wav}mp3"; 
   mkdir -p mp3; 
   mv "${i%wav}mp3" mp3/; 
done

mp32wav

mpg123 -w output.wav input.mp3

mp32ogg

mpg123 -w - ./FILE.mp3 | oggenc -q 3.00 -o ./FILE.ogg -

Video Files

Focus is ffmpeg and mencoder

Anyway, you might want to install some codecs first

sudo apt-get install libavcodec-extra-52 libavdevice-extra-52 \
                     libavformat-extra-52 libavutil-extra-50 \
                     libpostproc-extra-51 libswscale-extra-0 \
                     libavcodec-unstripped-52 ubuntu-restricted-extras

DVD2mp4

If you have a DVD or DVD.iso file create a single .VOB file first
In case of an ISO file use: -dvd-device /path/to/dvdfile.iso

mplayer dvd://n -v -dumpstream -dumpfile /var/tmp/dvd.vob

If ‘dvd://n’ does select the wrong track identify the longest track first and replace ‘n’ by the track number

$ lsdvd |grep Longest 
Longest track: 01

Now convert .vob to mp4

cat /var/tmp/dvd.vob | \
 ffmpeg -i - -codec:a copy -codec:v libx264 /var/tmp/dvd.mp4

Remove audio stream

ffmpeg -i input_file.mp4 -vcodec copy -an output_file.mp4

Replace or add audio stream

1st of all identify the different streams

$ ffmpeg -i video-with-audio.avi -i audio.mp3
[...]
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video-with-audio.avi':
  Duration: 00:01:13.29, start: 0.000000, bitrate: 17022 kb/s
    Stream #0.0(eng): Video: h264, yuv420p, 1920x1080, 90k tbr, 90k tbn, 180k tbc
    Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16
Input #1, mp3, from 'audio.mp3':
  Duration: 00:00:46.52, start: 0.000000, bitrate: 192 kb/s
    Stream #1.0: Audio: mp3, 44100 Hz, stereo, s16, 192 kb/s
At least one output file must be specified

As you can see in the output above we have

Stream 0.0 video-stream (within the avi file)
Stream 0.1 audio-stream (within the avi file)
Stream 1.0 audio-stream (within the mp3 file)

Now you can map the streams together as you like.
What I want to have is the video stream (0.0) and the audio stream from the mp3 file (1.0)

ffmpeg -i video-with-audio.avi -i audio.mp3 -map 0.0 -map 1.0 \
  -acodec copy -vcodec copy output.avi

Merge multiple videos

cat One.mpg Two.mpg Three.mpg | ffmpeg -f mpeg -i - -vcodec copy -acodec copy "Merged.mpg"

xvid2divx

As xvid and divx both use DX50 codec you don’t need to re-encode just relable the file

cfourcc -u DX50 -d DX50 "$file"

*2flv

ffmpeg -i ~/any.supported.format.eg.mp4 -b 4000000 -r 25 \
  -s 800x600 ~/output-file.flv

If you want to use it for web streaming you should add some pseudo streaming meta data to it
This will actually inject the meta data into the file

flvtool2 -Up output-file.flv

swf2*

Requires package: pyvnc2swf

$ vnc2swf-edit -o output.flv input.swf
$ ffmpeg -i input.flv output.avi

mp42audio

$ mplayer source.mp4 -ao pcm:file=final.wav
$ lame -b 128 -q 2 final.wav final.mp3

mkv2avi

mencoder "Original.mkv" -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=6000 \
  -oac mp3lame -lameopts vbr=3 -o "New.avi"

mkv2mp4

ffmpeg -i INPUT_FILE -f mp4 -r 23.976 -vcodec libx264 -s 1280x720 \
       -b 3000kb -aspect 16:9 -flags +loop -cmp +chroma -deblockalpha 0 \
       -deblockbeta 0  -maxrate 3500k -bufsize 4M -bt 256k -refs 1 \
       -bf 3 -coder 1 -me_method umh -me_range 16 -subq 7 \
       -partitions +parti4x4+parti8x8+partp8x8+partb8x8 -g 250 \
       -keyint_min 25 -level 30 -qmin 10 -qmax 51 -qcomp 0.6 -trellis 2 \
       -sc_threshold 40 -i_qfactor 0.71 -acodec libfaac -ab 384kb -ar 48000 \
       -ac 2 OUTPUT.MP4

ts2avi

mencoder SOURCE.ts -oac mp3lame -lameopts abr:br=128 -ovc lavc \
         -lavcopts vcodec=mpeg4:vhq:v4mv:vqmin=2:aspect=16/9:vbitrate=1267 \
         -vf pp=de,crop=0:0:0:0,scale=704:400 -ffourcc DX50 -o DESTINATION.avi

Tags: Commands