[MPlayer-users] Mencoder - video buffer full after ~4 mins. of recording

Ken Fuhrman kenf at interact-tv.com
Tue Mar 11 02:19:17 CET 2003

In general mencoder is working fine with no frame drops, for the
bitrates and parameters set, but after approximately 4-5 minutes of
recording it starts reporting that the  "video buffer full - dropping
frame".  I am recording
from v4l using mpeg4 and mp3 (see mencoder arguments below).

Mencoder continues reporting this message and no additional frames are
encoded.  The video/audio recorded to that point plays perfectly with no
frame drops.  I included the output of mencoder which shows when this

I am trying to figure out what is causing this, if there was an overall
performance problem I would expect more spurious frame drops.  I realize
mencoder takes up half of the memory and that I can specify a maximum
framebuffer size.
Any comments on why this is happening...I would love to use mencoder to
record longer video programs ;)

mencoder arguments:
mencoder  -tv
-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=750:v4mv:vqmax=31:keyint=300 
-oac mp3lame -lameopts cbr:br=64 -o output.avi
Output of mencoder:
Selected device: BT878(Hauppauge (bt878))
 Capabilites: capture tuner overlay clipping frameram scales
 Device type: 235
 Supported sizes: 48x32 => 768x480
 Inputs: 4
  0: Television: tuner audio tv camera  (tuner:1, norm:ntsc)
  1: Composite1: audio camera  (tuner:0, norm:ntsc)
  2: S-Video: audio camera  (tuner:0, norm:ntsc)
  3: Composite3: audio camera  (tuner:0, norm:ntsc)
Using input 'Television'
Selected channel: 3 (freq: 61.250)
[V] filefmt:9  fourcc:0x32315659  size:320x240  fps:29.00  ftime:=0.0345
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 44100 Hz, 2 ch, 16 bit (0x10), ratio: 176400->176400 (1411.2
Selected audio codec: [pcm] afm:pcm (Uncompressed PCM)
Opening video filter: [expand=-1:-1:-1:-1:1]
Expand: -1 x -1, -1 ; -1  (-1=autodetect) osd: 1
Opening video decoder: [raw] RAW Uncompressed Video
VDec: vo config request - 320 x 240 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (320x240 fourcc=58564944 [DIVX])
Selected video codec: [rawyv12] vfm:raw (RAW YV12)
MP3 audio selected
Building audio filter chain for 44100Hz/2ch/16bit ->
Writing AVI header...
Forcing audio preload to 0, max pts correction to 0
Pos: 263.5s   7892f ( 0%)  27fps Trem:   0min   0mb  A-V:0.000 [755:63]]
video buffer full - dropping frame
CBR audio: 8000 bytes/sec, 209 bytes/block
Writing AVI index...
Fixing AVI header...
Video stream:  752.184 kbit/s  (94022 bps)  size: 26183782 bytes 
278.483 secs  8341 frames
Audio stream:   64.000 kbit/s  (7999 bps)  size: 2227722 bytes  278.465

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