Hello! 
I’m new here, and I seem to be having an issue getting the audio and video to be rendered together. I’m using the program avconv, and when I enter this command on the terminal,
avconv -r 24 -i render/music_sync_tutorial.%04d.png -i music_sync_tutorial.ogg -c:a copy music_sync_tutorial.mp4
I get this as my output
[image2 @ 0x17a9160] Could not find codec parameters (Video: [0][0][0][0] / 0x0000)
render/music_sync_tutorial.%04d.png: could not find codec parameters
Does anybody know how I can fix this?! 
Please respond back if you do, thanks.