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

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Folks,

FLV "keyframes" meta data apparently is not being set correctly, even after updating and patching flvtool++-1.1.7. It may be useful to us to ask the author of that tool for a fix. As a result, steaming seeks is not possible. Can others corroborate this finding?

Thanks,
OSC

> ----- Original Message -----
> From: "Olivier Hervieu" <oli...@wa...>
> To: "Oscar Usifer" <osc...@pr...>
> Cc: "General discussion about vnc2swf" <vnc...@li...>
> Subject: Re: How to set FLV meta data (was Re: [Vnc2swf-users] About FLV output.)
> Date: Fri, 03 Apr 2009 10:19:17 +0200
> 
> 
> Greetings!
> 
> Yes, the resulted diff shows a minimal workaround to add some 
> metadata to the resulting flv (in fact framerate and duration). 
> These one are needed, otherwise, produced flv files are not 
> correctly read with flv players (such as FlowPlayer).
> 
> But it's still 'experimental'. And it will be nice to insert all 
> metadata like flvtool++ or flvtool2 does. On the other side, 
> flvtool++ or flvtool2 are post treatment tool. And, more your flv 
> file is heavy, more your post treatment is long...
> 
> In an ideal world, there should be inclusion of all the metadata 
> (such as flvtool + +) at creation time of the flv by vnc2swf .... 
> Still work to do!
> 
> If you're interested by this, read the following documentation :
> 
> http://osflash.org/flv
> http://pyamf.org/
> 
> Olivier.
> 
> Oscar Usifer a écrit :
> > 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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> >>
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> >>
> >
> >
> >
> >
> >

>

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