I have a working ffmpeg command to combine an audio/video file with an audio file, and I am now trying to perform the same operation using avconv on Ubuntu 14.04. My ffmpeg command requires the use of the complex filter adelay:
ffmpeg \ -i video_and_audio.webm \ -i audio_only.webm \ -c:v copy \ -filter_complex '[1:a] adelay=2500|2500 [delayed]; [0:a] [delayed] amix [out]' \ -map 0:v \ -map '[out]' \ out.webm Unfortunately this is a case where avconv and ffmpeg have different behavior; calling avconv with the same arguments produces this error:
[AVFilterGraph @ 0x1426ca0] No such filter: 'adelay' Error configuring filters.
Is there an avconv equivalent to this? Or do I need to install ffmpeg?
1 Answer
Is there an avconv equivalent to adelay?
No. They haven't redesigned that wheel yet (NIH syndrome).
See the rather short list of avconv audio filters.
Or do I need to install ffmpeg?
That is what I recommend. It's easy and you have several options (from easiest to hardest):
- Get a static build. Just download, extract, and execute. See below for more info.
- Use a PPA. See Ubuntu Multimedia for Trusty 14.04.
- Compile. You get the latest-and-greatest build and can customize to your liking.
- Upgrade your Ubuntu. FFmpeg returned in Ubuntu 15.04.
Using the static build
You can use the static build like this (assuming it is in the Downloads directory):
/home/mattm/Downloads/ffmpeg -i input ... or
~/Downloads/ffmpeg -i input ... or to make it "just work" by just entering ffmpeg from anywhere you can add it to a directory that is included in your PATH environmental variable:
mkdir ~/bin mv ~/Downloads/ffmpeg ~/bin hash -r ffmpeg . ~/.profile To undo:
rm ~/bin/ffmpeg hash -r ffmpeg 
