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

[James Lancaster]

On Monday 10 March 2003 19:19, you wrote:

How fast is your system? CPU etc (looks like the mencoder output was clipped, 
as mencoder should aways print it (along with version number) so PLEASE don't 
clip the output.

> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> 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).
>

This will happen if your system is just a bit too slow to encode it. it 
records to memory, but doesn't get encoded fast enough.

> 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
> happens.
>
> 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
> on:driver=v4l:device=/dev/video2:chanlist=us-cable:channel=3:forcechan=2:no
>rm=NTSC:width=320:height=240 \
> -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
> kbit)
> 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 ->
> 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
> secs
>
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