Let's look at how to upload a video YouTube HD. In the YouTube upload page is not specified as to become the HD video. In fact it is at the discretion of the user but the system, based on various parameters, classifies it as HD, HQ, or normal. In the YouTube Help
found at:
http://www.google.com/support/youtube/bin/answer.py?answer=132460&topic=16612&hl=it-IT
it appears follows:
In practice necessary and sufficient condition is that the video is 1280x720 in size preferably by con codec H264, mpeg2, mpeg4. L'audio deve avere frequenza 44.1kHz e i codec supportati sono mp3 e AAC.
QuickTime offre di base i codec H264 e mpeg4 mentre l'mpeg2 è più difficile da trovare essendo protetto da copyright. E' infatti il codec con cui si fanno i DVD video.
Bene. Andiamo a vedere allora come esportare un video da After Effects adatto al caricamento su YouTube HD.
1.
La composizione di After offre dei preset HD. Usiamo uno di quelli.
Su "Impostazione predefinita" selezioniamo "HDV/HDTV 720 25. This setting is suitable for HD video. As you can see the resolution set in automatic mode, the video size 1280x720 pixels square (rectangular ones are used for TV), and 25 frames per second. The duration the video is indifferent.
2.
Composed our video, export as follows:
Enter up "type of compressor" H264 or mpeg4 . Below, speed up click on "every" and write next 24. Please note that this is not representative frames per second, but it is a given that every 24 compression frames is taken a frame of reference. 24 is obtained by setting a good quality weight. The fps is expressed above: "current" which means the same as our video (25). Below, we have made maximum quality. On the right we set the "data rate": How much data processed per second playback. The higher the number, the video quality is high, weighs more than the final file. It seems that there are limits to YouTube's data rate. If the loading phase you have time available, click on "Automatic". The quality will be optimal. If you do not want a huge file, up to 1200 kbps the quality is decent. Under shelling starts, but the weight is reduced significantly. Experiment. Where there is a window where you choose interlaced fields (eg, Upper Field, Lower Field, etc. ..), select "Separated field" or "de-interlaced." Interlacing in this case does not concern us.
3.
Regarding the audio, the speech is similar. Set as a guide to the frequency 44.100 kHz, 16 bit Stereo. I advise you not to apply compression to the audio as QuickTime does not have to base it on the MP3 or AAC codec. Other codecs are destructive. So do not compress and click OK. If you have the codecs, you can compress the audio up to 128 kbps. Below the high frequencies are affected.
We are ready to export. The resulting file will be using QuickTime (. Mov) and of course the video aspect ratio of 16:9. Now you can upload it to Youtube.
In fact, you can also export to other formats, settings, remains to me more or less the same. In (. Avi) but there are settings for mpeg4 or h264 then you have to adapt to other formats probably heavier. Commented
letting me know if it is clear or if there are any inaccuracies. ^ _ ~
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