0
votes
0answers
149 views

using avconv to convert rbga image sequence into video while preserving alpha chanel

Is there any way to use "avconv" to convert a sequence of png images with alpha channel into a video and preserving the alpha channel? $ avconv -f image2 -framerate 60 -i img_%5d.png -r 29 foo.mp4 ...
2
votes
1answer
292 views

Extract M4A audio from a video and associate the artwork

Why on Ubuntu 12.04, when I extract audio in M4A from a video (MP4 or FLV, etc.) with avconv: avconv -i video.mp4 -c:a libvo_aacenc sound.m4a there is a video stream in it, and if I want only ...