synology ffmpeg

Timara> ffmpeg -f image2 -i ./cam_front%d.jpg ../test.avi
ffmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers
  built on Jun  3 2013 20:49:55 with gcc 4.6.4 20120731 (prerelease)
  configuration: --prefix=/usr/syno --arch=arm --target-os=linux --cross-prefix=/usr/local/arm-marvell-linux-gnueabi/bin/arm-marvell-linux-gnueabi- --enable-cross-compile --enable-optimizations --disable-yasm --disable-altivec --enable-pic --enable-shared --disable-static --disable-swscale-alpha --disable-ffserver --disable-ffplay --enable-libmp3lame --enable-libfaac --enable-nonfree --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-indev=alsa --disable-outdev=alsa --cc=/usr/local/arm-marvell-linux-gnueabi/bin/arm-marvell-linux-gnueabi-ccache-gcc
  libavutil    50. 40. 1 / 50. 40. 1
  libavcodec   52.120. 0 / 52.120. 0
  libavformat  52.108. 0 / 52.108. 0
  libavdevice  52.  4. 0 / 52.  4. 0
  libavfilter   1. 77. 0 /  1. 77. 0
  libswscale    0. 14. 0 /  0. 14. 0
[image2 @ 0x40fc0] max_analyze_duration reached
Input #0, image2, from './cam_front%d.jpg':
  Duration: 00:00:40.96, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: mjpeg, yuvj422p, 640x480, 25 fps, 25 tbr, 25 tbn, 25 tbc
Incompatible pixel format 'yuvj422p' for codec 'mpeg4', auto-selecting format 'yuv420p'
File '../test.avi' already exists. Overwrite ? [y/N] y
[buffer @ 0x53f80] w:640 h:480 pixfmt:yuvj422p
[ffsink @ 0x555e0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
[scale @ 0x48040] w:640 h:480 fmt:yuvj422p -> w:640 h:480 fmt:yuv420p flags:0x4
Output #0, avi, to '../test.avi':
  Metadata:
    ISFT            : Lavf52.108.0
    Stream #0.0: Video: mpeg4, yuv420p, 640x480, q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
[image2 @ 0x40fc0] Could not open file : ./cam_front532.jpgte= 277.0kbits/s
frame=  531 fps=  2 q=31.0 Lsize=     726kB time=21.24 bitrate= 279.9kbits/s
video:708kB audio:0kB global headers:0kB muxing overhead 2.579490%