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author | Bernie Innocenti <bernie@codewiz.org> | 2010-05-03 21:53:47 (GMT) |
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committer | Bernie Innocenti <bernie@codewiz.org> | 2010-05-03 21:53:47 (GMT) |
commit | 1030dc837b10a03a02a85d5504cbeec168ce49e2 (patch) | |
tree | 698eefa87ac437deaf36a4141b326f8ce7986692 /help/rest/video.txt |
Import XaoS r489 (trunk after version 3.5)
Diffstat (limited to 'help/rest/video.txt')
-rw-r--r-- | help/rest/video.txt | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/help/rest/video.txt b/help/rest/video.txt new file mode 100644 index 0000000..bc4adf3 --- /dev/null +++ b/help/rest/video.txt @@ -0,0 +1,99 @@ +.. _video: + +.. index:: + pair: Encoding; Videos + +Encoding Videos +=============== + +To create a video, make and xaf file first (the easiest way to do this is to +use the **record** function in the file menu). Then you need to render the +animation. XaoS can output sequences of ordinary PNG images, that can later be +used by a video encoder. + +Generating image sequences for video +------------------------------------ + +To generate an image sequence, choose **Render Animation** from the **Misc** +menu. You can also use the following command on the command line: + +xaos -render [filename] -size 352x240 -antialiasing -renderframerate 24 +-basename [basename] + +**File to render** ([filename]) is the name of the xaf file, **Basename** +([basename]) is the name used as the base filename for rendered images. This +should also include the path where you want to save the images. XaoS adds a +four digit sequence number and .png extension to this name automatically. + +You might also want to change the resolution. Make sure that the resolution you +choose is supported by the video codec you wish to use. + +The framerate can also be altered. Make sure you choose a framerate that is +supported by the video codec you wish to use. + +**Antialiasing** (-antialiasing) is used to produce anti-aliased images. It +takes a much longer time and much more memory to calculate them, but resulting +images are better for video compression and they result in a much smaller video +file. (the same is true of **JPEG images**) + +On the other hand, the other XaoS rendering option **Always Recalculate** +(-alwaysrecalc) (which disables XaoS's zooming optimizations) is **not +recommended**. If that's used, the sequence of animation then contains quite a +lot of extra information, which increases size of video file, but because of +the codec's lossy compression it is hard to see any difference, so it's not +worth it. + +Rendered files +-------------- + +Once you start it, XaoS will generate thousands of frames. They take quite a +long time to calculate and save, and consume plenty of disk space. (e.g. to +render part 1 of the tutorial you need about 60MB and half an hour of time). + +All images are named [basename]framenum.png. For example intro0001.png is the +first frame of the animation intro. If consecutive frames are the same, XaoS +doesn't save them, so some frames may be missing. If your encoder can't handle +that, you will need to write a simple script which will fill in the gaps by +means of mv or symbolic linking. + +A list of all filenames is saved into the file [basename].par, where each line +is the name of one frame. The names repeat here if necessary, so you can use +this file to supply filenames to the encoder. + +Encoding videos +--------------- + +Once XaoS has generated the png files for each frame of the animation, you can +use a third-party video encoder to convert the sequence of images into a video +file. We currently recommend the following encoders, which support a wide +variety of video codecs and file formats: + +ffmpeg + +* `ffmpeg home page`_ +* `ffmpeg instructions`_ + +.. _`ffmpeg home page`: + http://ffmpeg.mplayerhq.hu/ + +.. _`ffmpeg Instructions`: + http://ffmpeg.mplayerhq.hu/faq.html#SEC12 + +mencoder (part of mplayer) + +* `mplayer homepage`_ +* `mencoder instructions`_ + +.. _`mplayer homepage`: + http://www.mplayerhq.hu/ + +.. _`mencoder instructions`: + http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-enc-images.html + +These are both command line tools. If you prefer a graphical tool, you may +prefer `Quicktime Pro`_ from Apple. However, this software costs approximately +US $30. Although QuickTime may be easier to use, the two free +encoders above are just as capable once you learn how to use them. + +.. _`Quicktime Pro`: + http://www.apple.com/quicktime/pro/ |