Re: [Vnc2swf-users] How to set FLV meta data (was Re: About FLV output.)

[Oscar U. <osc...@pr...>]

Amigo,

Thank you for the great info on producing FLV outputs. I attempted to reproduce your steps, found the output is producing only a single frame. I built ffmpeg (from ports collection in freebsd), and have been trying to get the stream conversion to work. The problem I am seeing is that only one output frame is produced in the resulting .flv file.  What form of the command ffmpeg do I need to use? I did look at the docs, but was not able to decipher too well.

Thanks,
-OSC

zcat FILM089.vnc.gz | ./vncrec -movie /dev/stdin | ffmpeg -f yuv4mpegpipe -i /dev/stdin -y FILM089.flv


[osc@builder ~]$ Xvfb :3 -screen 0 2048x1536x24 &
[1] 8921
[osc@builder ~]$ expected keysym, got XF86KbdLightOnOff: line 70 of pc
expected keysym, got XF86KbdBrightnessDown: line 71 of pc
expected keysym, got XF86KbdBrightnessUp: line 72 of pc
Could not init font path element /usr/local/lib/X11/fonts/TTF/, removing from list!
Could not init font path element /usr/local/lib/X11/fonts/OTF, removing from list!

[osc@builder ~]$ zcat FILM089.vnc.gz | ./vncrec -movie /dev/stdin | ffmpeg -f yuv4mpegpipe -i /dev/stdin -y FILM089.flv
VNC server supports protocol version 3.3 (viewer 3.3)
VNC authentication succeeded
Desktop name "ou0b46"
Connected to VNC server, using protocol version 3.3
VNC server default format:
  32 bits per pixel.
  Least significant byte first in each pixel.
  True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
FFmpeg version SVN-r14424, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  configuration: --cc=cc --prefix=/usr/local --disable-debug --enable-memalign-hack --enable-shared --enable-postproc --extra-cflags= -I/usr/local/include --extra-ldflags=-L/usr/local/lib -la52 --extra-libs=-pthread --enable-gpl --enable-pthreads --enable-swscale --mandir=/usr/local/man --enable-liba52 --enable-liba52bin --disable-libfaac --disable-libfaad --disable-libamr-nb --disable-libamr-wb --disable-mmx --disable-libgsm --disable-libmp3lame --disable-ffplay --disable-libtheora --disable-libvorbis --enable-libx264 --enable-libxvid
  libavutil version: 49.7.0
  libavcodec version: 51.61.0
  libavformat version: 52.18.0
  libavdevice version: 52.0.0
  built on Apr 22 2009 16:42:55, gcc: 4.2.1 20070719  [FreeBSD]
Using default colormap which is TrueColor.  Pixel format:
  32 bits per pixel.
  Least significant byte first in each pixel.
  True colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
red_mask=ff0000, green_mask=ff00, blue_mask=ff, CPU endian=0, dpy endian=0
Image dump color channel shifts: R=16, G=8, B=0
Dumping 18 frames for time 1.80 sec.
Input #0, yuv4mpegpipe, from '/dev/stdin':
  Duration: N/A, bitrate: N/A
    Stream #0.0: Video: rawvideo, yuv420p, 1189x911, 10.00 tb(r)
Output #0, flv, to 'FILM089.flv':
    Stream #0.0: Video: flv, yuv420p, 1189x911, q=2-31, 200 kb/s, 10.00 tb(c)
Stream mapping:
  Stream #0.0 -> #0.0
frame=    1 fps=  0 q=9.8 Lsize=     154kB time=0.10 bitrate=12647.0kbits/s    
video:154kB audio:0kB global headers:0kB muxing overhead 0.128575%
[osc@builder ~]$ 



> ----- Original Message -----
> From: "The Amigo" <the...@gm...>
> To: "General discussion about vnc2swf" <vnc...@li...>
> Subject: Re: [Vnc2swf-users] How to set FLV meta data (was Re: About FLV	output.)
> Date: Fri, 3 Apr 2009 15:46:31 -0500
> 
> 
> I used pyvnc2swf for a bit, but found that it took far too much CPU time.
> Instead, here's what I do now:
> 
> 1) Use this patched vncrec: http://aur.archlinux.org/packages.php?ID=16265
> In addition to simply recording vnc sessions to a log file, it can convert
> the recordings to YUV4MPEG (the twibright patch) on stdout (my patch).
> 
> 2) Use ffmpeg to read the YUV4MPEG stream and write an .flv
> 
> A couple of caveats however:
>   - vncrec needs an X display (use Xvfb to create a virtual one, but make
> sure it's at least as large as your video)
>   - flashsv is the lossless video codec that will generally produce smaller
> files for screen recordings while maintaining perfect quality
>   - if your ffmpeg doesn't have flashsv support and you have to compile from
> source, install zlib-devel
>   - scaling down the video size with ffmpeg will often result in a larger
> file size (due to the added anti-aliasing), for web-based playback, you can
> save bandwidth by having a swf player scale the video down.


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