macbook:ffmpeg memphis$ ./ffmpeg -dsth 720 -sws_flags fast_bilinear -i testpic.jpg testpic-sized.jpg
ffmpeg version 0.10.2 Copyright (c) 2000-2012 the FFmpeg developers
built on Jul 17 2012 22:04:19 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
configuration: --disable-avfilter --disable-yasm
libavutil 51. 35.100 / 51. 35.100
libavcodec 53. 61.100 / 53. 61.100
libavformat 53. 32.100 / 53. 32.100
libavdevice 53. 4.100 / 53. 4.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
Input #0, image2, from 'testpic.jpg':
Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj422p, 753x1024 [SAR 72:72 DAR 753:1024], 25 tbr, 25 tbn, 25 tbc
Output #0, image2, to 'testpic-sized.jpg':
Metadata:
encoder : Lavf53.32.100
Stream #0:0: Video: mjpeg, yuvj422p, 753x1024, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg -> mjpeg)
Press [q] to stop, [?] for help
frame= 1 fps= 0 q=5.9 Lsize= 0kB time=00:00:00.04 bitrate= 0.0kbits/s
video:77kB audio:0kB global headers:0kB muxing overhead -100.000000%