Category Archives: Tutorials

Basic FFmpeg command lines

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want to convert a avi file to flv? extract the sound from a flv file and save it as mp3? see below:

1. Getting info from a video file

ffmpeg -i video.avi

2. Turn a sequence of images into video

ffmpeg -f image2 -i image%d.jpg video.mpg

3. Turn a video into a sequence of images

ffmpeg -i video.mpg image%d.jpg

4. Encode video for Ipod/IPhone

ffmpeg -i source_video_file.avi -acodec aac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv -trell 1 -aic 2 -cmp 2 -subcmp 2 -s 320×180 -title X output_file.mp4

5. Encode video for PSP

ffmpeg -i source_video_file.avi -b 300 -s 320×240 -vcodec xvid -ab 32 -ar 24000 -acodec aac output_file.mp4ORffmpeg -i “OriginalFile.avi” -f psp -r 29.97 -b 768k -ar 24000 -ab 64k -s 320×240 “OutputFile.mp4”

6. Extract audio from a video file and save it as mp3 format

ffmpeg -i source_video_file.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 output_file.mp3

7. Convert a wave file to mp3

ffmpeg -i original_audio_file.avi -vn -ar 44100 -ac 2 -ab 192 -f mp3 output_file.mp3

8. Convert a avi video to mpeg

ffmpeg -i original_movie.avi output_file.mpg

9. Convert a mpeg video to avi

ffmpeg -i original_movie.mpg output_file.avi

10. Convert a avi video to uncompressed animated gif

ffmpeg -i original_movie.avi output_file.gif

11. Add audio to an existing video-only file (mix audio and video)

ffmpeg -i son.wav -i original_movie.avi output_file.mpg

12. Convert a avi video to flv (flash video)

ffmpeg -i original_movie.avi -ab 56 -ar 44100 -b 200 -r 15 -s 320×240 -f flv output_file.flv

13. Convert a flv video to mpeg

ffmpeg -i myFile.flv -ab 56 -ar 22050 -b 500 -s 320×240 myFile.mpg

14. Convert a avi video to dv

ffmpeg -i original_movie.avi -s ntsc -r ntsc -aspect 4:3 -ar 48000 -ac 2 output_file.dvORffmpeg -i original_movie.avi -target ntsc-dv output_file.dv

15. Convert a avi video to mpeg specifically for DVD creation

ffmpeg -i source_video.avi -target ntsc-dvd -ps 2000000000 -aspect 16:9 finale_video.mpeg

16. Compress a avi video to Divx

ffmpeg -i original_movie.avi -s 320×240 -vcodec msmpeg4v2 output_file.avi

17. Convert a Ogg Theora video to mpeg specifically for DVD creation

ffmpeg -i original_movie.ogm -s 720×576 -vcodec mpeg2video -acodec mp3 output_file.mpg

18. Convert a avi video to mpeg2 for SVCD creation

ffmpeg -i original_movie.avi -target ntsc-svcd output_file.mpg

19. Convert a avi video to mpeg2 for VCD creation

ffmpeg -i original_movie.avi -target ntsc-vcd output_file.mpg

simple way to install flvtool2 on a centos server | 00.00 duration of a video?

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During the conversion of videos to flv format using ffmpeg, most video scripts use flvtool2 to calculate the duration of the video and to make the thumbs, sometimes it so happens that although flvtool2 is installed on the server, the duration is not calculated and all videos come out a 00.00 duration or the thumbs aren’t created, in this case it s better to reinstall flvtool2.
A simple way to reinstall flvtool2 with out having to reinstall the all ffmpeg libraries is the scope of this post.
First, make sure you have the newest version of Ruby installed from the Site Manager.
Login to root of your server, I assume it is a Centos 5.5 and enter the following commands:

# cd /usr/local/src
# wget http://rubyforge.org/frs/download.php/17497/flvtool2-1.0.6.tgz
# tar zxf flvtool2-1.0.6.tgz
# cd flvtool2-1.0.6
# ruby setup.rb config –prefix=/usr/local/
# ruby setup.rb setup
# ruby setup.rb install

this will install the application into /usr/local/bin for you, and that is all. You are done, To use it, you can use this:
# cat /var/videos/flv/video.flv | flvtool2 -U stdin /var/videos/flv/video.flv

this will add the metadata to the flv file so that media players can read the file correctly.

On the official flvtool2 page http://rubyforge.org/projects/flvtool2/ the description of flvtool2 is:
FLVTool2 is a manipulation tool for Macromedia Flash Video files (FLV). It can calculate a lot of meta data, insert an onMetaData tag, cut FLV files, add cue points (onCuePoint), show the FLV structure and print meta data information in XML or YAML.

Of course if you host your video site with us FFmpeg Hosting this problems will not arise!! 🙂