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?