[Vnc2swf-users] How to set FLV meta data (was Re: About FLV output.)
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[Vnc2swf-users] How to set FLV meta data (was Re: About FLV output.)
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From: Oscar U. <osc...@pr...> - 2009-04-02 22:24:30
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Folks,
I updated __init__.py and commented out import play, and that got me further, so I could at least test. The result of this, was being able to use the vnc2swf-recorder script to output .flv reading from a streaming stdin input. However the resulting output files contained blank frames. Seeing that v.0.10.0 swf.py had the updates to write out the meta-data for .flv formats, I attempted to simply update this file with the diff, but with the same bad result as before. Below is an approximate diff.
"flvtool++" (v.1.1) apparently is a work around for this situation. It will create the flv meta data, but does not write the correct height meta-data value either because pyvnc2swf writes it incorrectly (see swf.py use of 'rect' in FLVWriter), or because flvtool++.cpp does uses an incorrect algorithm to read it. The diff resolves this.
Thanks
[osc@builder-freebsd ~/packages/flvtool++/src/patch]$ diff flvtool++.cpp /usr/ports/multimedia/flvtool++/work/flvtool++.cpp
190,191c190,191
< h = ((*(vptr++)) & 0x0f) << 8;
< h += ((*(vptr++)) & 0xff);
---
> h = ((*(vptr++)) & 0xff) << 4;
> h = ((*(vptr++)) & 0xf0) >> 4;
[osc@rt01 /var/ee/www/swf]$ ~/flvtool++ /tmp/FILM078.flv /tmp/FILM078.2.flv
Video: 878x629 SCREEN
Total: 313234 video bytes (190.329029 kbps), 0 audio bytes (0.000000 kbps), 13.166000 seconds long
Final onMetaData tag contents: {
audiodatarate: 0.000000
audiosize: 0.000000
canSeekToEnd: true
datasize: 316322.000000
duration: 13.166000
framerate: 12.076561
hasAudio: false
hasCuePoints: false
hasKeyframes: true
hasMetadata: true
hasVideo: true
height: 629.000000
keyframes: {
filepositions: {
544.000000
}
times: {
0.000000
}
}
lasttimestamp: 13.166000
metadatacreator: flvtool++ (Facebook, Motion project, dweatherford)
metadatadate: Thu Apr 2 22:10:27 2009
totalframes: 159.000000
videocodecid: 3.000000
videodatarate: 190.329029
videosize: 313234.000000
width: 878.000000
}
[osc@builder-freebsd ~/packages/vnc2swf/src/pyvnc2swf-0.9.5/pyvnc2swf]$ diff swf-0.10.0.py swf.py
854d853
<
857,871d855
<
< # Meta Data information must be at the start of the file....
< # Reserve here an area of 100 char to store meta data information
< # I know this is a bit ugly.. But i have no better idea...
< i = 0
< self.pos = self.outfp.tell()
< self.writeui8(18)
< self.writeub24(100)
< self.writeub24(0)
< self.writeui32(0)
< self.outfp.flush()
< while i < 100:
< self.writeui8(0)
< i = i+1
< self.writeub32(111)
885,926d868
< # To be correctly played into a FLV Player, flv files has to handle some meta data
< # With framerate and duration, many flv player successfully read the produced
< # FLV Stream
< import struct
<
< # Flushing all the remaining data
< self.outfp.flush()
<
< # Write metadata information
< self.outfp.seek(self.pos)
<
< # The needed metadata are stored in flv with amf format.
< # For documentation, see :
< # - http://osflash.org/flv
< # - http://pyamf.org/
< # Following metadata was generated with the help of pyamf
<
< duration = framecount / self.framerate
< meta = '\x02\x00\nonMetaData\x08\x00\x00\x00\x00\x00\x08'
< meta += 'duration\x02' + struct.pack('>H',len(str(duration))) + str(duration)
< meta += '\x00\x0ccanSeekToEnd\x01\x01\x00\t'
< meta += 'framerate\x02' + struct.pack('>H',len(str(self.framerate))) + str(self.framerate) + '\x00'
< # writing metadata duration
< self.writeui8(18)
< self.writeub24(100)
< self.writeub24(0)
< self.writeui32(0)
< # Insert pseudo Data to fill the rest of the reserved space
< rest = 100 -len(meta) -22
< meta +='\x0fuselessdatabuff\x02' + struct.pack('>H',rest)
< data = ''
< while len(data)<rest:
< # Inserting Blank Data
< data += '\x00'
< meta += data
< meta += '\x00\x00\t'
< self.write(meta)
< print len(meta)
< self.writeub32(111)
<
< self.outfp.seek(0,2) #The end of file
< self.outfp.flush()
Command I am using test
For v. 0.10.0
400 zcat FILM075.vnc.gz | vnc2swf-recorder -n -z -o /tmp/FILM078.flv -V
For v. 0.9.5
411 zcat FILM078.vnc.gz | /usr/local/pyvnc2swf/bin/vnc2swf.py -n -z -o /tmp/FILM078.flv -V
> ----- Original Message -----
> From: "Oscar Usifer" <osc...@pr...>
> To: oli...@wa...
> Cc: "General discussion about vnc2swf" <vnc...@li...>
> Subject: Re: [Vnc2swf-users] About FLV output.
> Date: Thu, 2 Apr 2009 13:52:36 -0500
>
>
> It complains pygame is not installed. Is there a version that uses
> PIL instead, or is there a setup option to set it to use PIL?
>
> Thanks
>
>
>
> > ----- Original Message -----
> > From: "Olivier Hervieu" <oli...@wa...>
> > To: "Oscar Usifer" <osc...@pr...>
> > Cc: "General discussion about vnc2swf" <vnc...@li...>
> > Subject: Re: [Vnc2swf-users] About FLV output.
> > Date: Thu, 02 Apr 2009 10:26:44 +0200
> >
> >
> > The attached tarball has a setup.py that respect standard python
> > distribution style.
> >
> > Run
> >
> > python setup.py build
> > python setup.py install
> >
> > You can have some help by running
> >
> > 'python setup.py --help' or 'python setup.py --help [command name]'
> >
> > Forget the old makefile. I leave it here for euske.
> >
> > Regards,
> >
> > Olivier.
> >
> > Oscar Usifer a écrit :
> > > Greets Olivier,
> > >
> > > Just a few requests. I would like to test it out, but am not
> > able > to get it into an installed state. I tried to run
> > setup.py, but > it seems to output usage along the way instead of
> > actually > performing an install. I was not able to use your
> > package, as > make fails as well. Could you please update so that
> > it is > compatible with the current build system? Also, I have a
> > target > system that I use for installation, so the setup/make
> > would need > an option to install into a target directory instead
> > of into a > system. I can take your work and figure out how to
> > get it > completely installed, but not everyone has the time or
> > desire to > go to that level of energy output. Also, I am
> > beginner level with > Python, which makes it less accessible.
> > >
> > > Thanks,
> > > OSC
> > >
> > >
> > >
> > >
> > >> ----- Original Message -----
> > >> From: "Olivier Hervieu" <oli...@wa...>
> > >> To: vnc...@li..., "Yusuke Shinyama" >>
> > <yu...@cs...>
> > >> Subject: [Vnc2swf-users] About FLV output.
> > >> Date: Mon, 30 Mar 2009 16:49:48 +0200
> > >>
> > >>
> > >> Hi all,
> > >>
> > >> Vnc2swf can produce FLV. But produced files present some drawbacks.
> > >>
> > >> - files has only one keyframe (also report a few weeks ago),
> > >> - files has no metadata. This means that support of pyvnc2swf
> > >> FLV files is not complete for most FLV players (impossible to
> > >> scroll, total record time is not available (a good example :
> > >> test your pyvnc2swf FlV in FlowPlayer)).
> > >>
> > >> I attach a tarball containing some modifications:
> > >>
> > >> - add a '-k' option to specify the keyframe rate
> > >> - Add meta data on the produced flv.
> > >>
> > >> Note that I also repackage pyvnc2swf to be more pythonic. >>
> > Vnc2swf scripts, edit and play are replaced by scripts >>
> > vnc2swf-recorder, vnc2swf-editor and vnc2swf player. The >>
> > distribution is now built and installed with setuptools.
> > >>
> > >> The Cli interface was successfully tested on Ubuntu 8.04 and Debian Lenny.
> > >>
> > >> Also note that I did not (and do not want to) install
> > python-tk. >> I paid attention to add some options in the GUI.
> > But these >> changes are not yet tested,.
> > >>
> > >> I leave to Euske or others to test and commit these changes.
> > >>
> > >> Regards,
> > >>
> > >> Olivier Hervieu.
> > >> << pyvnc2swf-0.10.0.tar.gz >>
> > >>
> > >>
> > >
> > >
> > >
>
> >
>
>
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