I'm using avconv for merging an audio file with a video file. I'm using a script in which the video length will vary from file to file. So, I use -shortest flag to stop audio abruptly at the end of the video. I want to fade out audio alone for 2 seconds at the end of the video. But, I don't know the exact length of a particular video.
avconv -i inputvideo.mp4 -i inputaudio.mp3 -c:v copy -c:a aac -strict experimental -shortest videowithfadedaudio.mp4
What should I do?
