[FORMAT]
filename=2012-11-14/silent-boot.mp4
nb_streams=2
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime/MPEG-4/Motion JPEG 2000 format
start_time=0.000000 
duration=24.659592 
size=26042652.000000 
bit_rate=8448688.000000 
TAG:major_brand=isom
TAG:minor_version=512
TAG:compatible_brands=isomiso2avc1mp41
TAG:date=2012-11-14T11:42:21+0800
TAG:encoder=Lavf54.36.100
[/FORMAT]
[FORMAT]
filename=2012-11-14/silent-boot.webm
nb_streams=2
format_name=matroska,webm
format_long_name=Matroska/WebM file format
start_time=0.000000 
duration=24.639000 
size=1947907.000000 
bit_rate=0.000000 
[/FORMAT]

ffmpeg logfile

r2d2.sh source