Changes between Version 3 and Version 4 of Capture/Lightning


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Timestamp:
May 3, 2014, 5:39:40 AM (5 years ago)
Author:
Timothy_Gu
Comment:

Change heading level

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  • Capture/Lightning

    v3 v4  
    11[[PageOutline(1-100,Contents)]]
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    3 = The problem =
     3== The problem ==
    44
    55This is a funny tutorial that describes one of the ways you can capture a lightning, during storms. The problem with a lightning capturing is that it happens at a random time interval and lasts for a brief moment of time, so it is very tricky to capture it easily. The usual way is to record the sky continuously for a longer time period and later to edit the recording and cut the pieces where the lightning happened or using some hi-tech expensive cameras, that can do all this for you.
    66
    7 = The ideal solution =
     7== The ideal solution ==
    88
    99But let's do this in a cheap and easy way. What we need is to capture the video of the sky continuously and to save a video only when a lightning happens. We can accomplish this by using "buffered capturing". Consider the following example.
     
    2626Now, this all looks great, except FFmpeg doesn't have (yet) a "-delay <seconds>" option, which will buffer and delay the output for specified number of seconds. If you are interested in a discussion about the "-delay" option in ffmpeg, please [http://ffmpeg.org/trac/ffmpeg/ticket/1753 read this ticket]. I hope this will be implemented soon, but until then, we can use another tool, which can do what we need.
    2727
    28 = The actual solution =
     28== The actual solution ==
    2929
    3030The tool we will use is a modified version of [http://code.google.com/p/samplicator/ Samplicator tool] which "Sends copies of (UDP) datagrams to multiple receivers". The modified version of this tool has a feature added that allows Samplicator to delay its output UDP stream for some time.
     
    4545}}}
    4646
    47 = Download =
     47== Download ==
    4848
    4949The source code of the modified Samplicator tool can be found here: [http://ffmpeg.gusari.org/uploads/samplicator-1.3.6-z.tar.gz]