Movie record quality bad

Question

ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.04.1, Copyright (c) 2000-2013 the Libav developers
  built on Nov  9 2013 19:09:48 with gcc 4.7.3

Same with self compiled ffmpeg version.

Config:
daemon on
process_id_file /var/run/motion/motion.pid
setup_mode off
minimum_frame_time 0
netcam_http 1.0
netcam_tolerant_check off
auto_brightness off
brightness 0
contrast 0
saturation 0
hue 0
roundrobin_frames 1
roundrobin_skip 1
switchfilter off
threshold 3000
threshold_tune off
noise_level 32
noise_tune on
despeckle EedDl
smart_mask_speed 0
lightswitch 30
minimum_motion_frames 1
pre_capture 3
post_capture 50
gap 60
max_mpeg_time 0
output_all off
output_normal best
output_motion off
quality 100
ppm off
ffmpeg_cap_new on
ffmpeg_cap_motion off
ffmpeg_timelapse 0
ffmpeg_timelapse_mode weekly-monday
ffmpeg_bps 500000
ffmpeg_variable_bitrate 2
ffmpeg_video_codec swf
ffmpeg_deinterlace off
snapshot_interval 0
locate on
text_right %Y-%m-%d\n%T-%q
text_changes off
text_event %Y%m%d%H%M%S
text_double off
target_dir /usr/share/zoneminder/motion
snapshot_filename %Y%m%d/camera-%t/snapshots/hour-%H/camera-%t-%v-%Y%m%d%H%M%S-snapshot
jpeg_filename %Y%m%d/camera-%t/motions/hour-%H/camera-%t-%v-%Y%m%d%H%M%S-%q-motion
movie_filename %Y%m%d/camera-%t/movies/hour-%H/camera-%t-%v-%Y%m%d%H%M%S-movie
timelapse_filename %Y%m%d/camera-%t/timelapses/hour-%H/camera-%t-%Y%m%d-timelapse
webcam_port 0
webcam_quality 50
webcam_motion on
webcam_maxrate 1
webcam_localhost off
webcam_limit 0
control_port 8080
control_localhost off
control_html_output on
control_authentication xxx:xxx
track_type 0
track_auto off
track_motorx 0
track_motory 0
track_maxx 0
track_maxy 0
track_iomojo_id 0
track_step_angle_x 10
track_step_angle_y 10
track_move_wait 10
track_speed 255
track_stepsize 40
quiet on
sql_log_image on
sql_log_snapshot on
sql_log_mpeg on
sql_log_timelapse off
thread /etc/motion/thread1.conf



width 1600
height 1200
framerate 5
netcam_url http://192.168.215.101/cgi-bin/viewer/video.jpg?resolution=1600x1200
netcam_userpass xxx:xxx
area_detect 1 2 4 5 7 8 9
mask_file /etc/motion/mask-camfront.pgm
smart_mask_speed 3
text_left CAM-front
webcam_port 8082




[0] Processing thread 0 - config file /etc/motion/motion.conf
[0] Processing config file /etc/motion/thread1.conf
[0] Motion 3.2.12 Started
[0] ffmpeg LIBAVCODEC_BUILD 3482368 LIBAVFORMAT_BUILD 3478785
[0] Motion running in setup mode.
[0] Thread 1 is from /etc/motion/thread1.conf
[0] Thread 1 is device: http://192.168.215.101/cgi-bin/viewer/video.jpg?resolution=1600x1200 input -1
[0] Webcam port 8082
[0] Waiting for threads to finish, pid: 4416
[1] Thread 1 started
[1] Camera thread starting...
[0] motion-httpd/3.2.12 running, accepting connections
[0] motion-httpd: waiting for data on port TCP 8080
[1] Non-streaming camera (keep-alive not set)
[1] Resizing pre_capture buffer to 1 items
[1] Camera handler thread [2]  started
[1] Maskfile "/etc/motion/mask-camfront.pgm" loaded.
[1] Started stream webcam server in port 8082
[1] Resizing pre_capture buffer to 4 items
[1] Non-streaming camera (keep-alive not set)
[1] Raw changes:     0 - changes after 'EedDl':     0 - labels:   0 - noise level: 21
[1] Lightswitch detected
[1] Raw changes:     0 - changes after 'EedDl':     0 - labels:   0 - noise level: 21
[1] Non-streaming camera (keep-alive not set)
[1] Raw changes:     0 - changes after 'EedDl':     0 - labels:   0 - noise level: 21
[1] Non-streaming camera (keep-alive not set)
[1] Raw changes:     0 - changes after 'EedDl':     0 - labels:   0 - noise level: 21
[1] Non-streaming camera (keep-alive not set)
[1] Raw changes:  7097 - changes after 'EedDl':     0 - labels:   0 - noise level: 21
[1] Non-streaming camera (keep-alive not set)

Environment

Answer