How do you fade video and audio in from and out to back avconv? I have found many posts on how to do this with ffmpeg but non with avconv. The length of the video will change between videos. Is it still possible to fade video and audio in and out and how may I do it?
Below is my current setup:
avconv -loop 1 -i img.jpg -i "song.mp3" -c:v libx264 -tune stillimage -pix_fmt yuv420p -q:a 100 -q:v 0 -s hd1080 -shortest output.mp4