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

[Olivier H. <oli...@wa...>]

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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