[MPlayer-users] Re: Mencoder - video buffer full after ~4 mins. of recording (James Lancaster)

[Marcin Bukat]

Uz.ytkownik Ken Fuhrman napisa?:

>[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>  
>
>>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.
>>    
>>
>
>Sorry about that, below is the missing output.  It is a 900Mhz VIA C3
>processor.  The FPU is running slower in this C3 processor, the next
>version of this processor is suppose to enable the FPU to run twice as
>fast.  I think the solution will be to encode audio as PCM (no
>compression).  And then make a 2nd pass later to compress the audio and
>reduce the file size.
>
>-- missing mencoder output ----
> 
>MEncoder 0.90rc4-RPM-3.1 (C) 2000-2003 Arpad Gereoffy (see DOCS)
> 
>CPU: IDT/Centaur/VIA  (Family: 6, Stepping: 9)
>Detected cache-line size is 32 bytes
>CPUflags: Type: 6 MMX: 1 MMX2: 0 3DNow: 1 3DNow2: 0 SSE: 0 SSE2: 0
>Reading /root/.mplayer/codecs.conf: can't open
>'/root/.mplayer/codecs.conf': No such file or directory
>Reading /etc/mplayer/codecs.conf: 50 audio & 135 video codecs
>File not found: 'frameno.avi'
>Reading config file /root/.mplayer/mencoder: No such file or directory
>success: format: 0  data: 0x0 - 0x0
>TV detected! ;-)
>
>  
>
>>>[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
>>>
>>>      
>>>
Your system i s definitly too slow for realtime encoding. VIA C3 are 
known to be very slow in coding.