I have some code that used CreateJS /EaselJS to create a MovieClip that contains a Tween that contains an mp4 video. In MovieClip there is a method called 'gotoAndPlay' that you can use to change the timeline position of the playhead to a certain frame number. When using this method to change the play position of the video the tweens work but not the Tween that contains the mp4 movie...this object does not load is result in a blank video tag on the page except for the first play through of the clip. Once the mp4 video has been played it didn't play again if the position was set to it through gotoAndPlay...any ideas on how to fix this or if something wrong might be happening?
In ActionScript animations, FLV movies can be locked to the timeline. But in HTML Canvas animations, MP4 movies are not really fully-fledged "Animate" objects. They look the same for the most part but the integration is not as tight as in Flash.
Since the videos exist outside of the Canvas, you'll need to use jQuery or JavaScript to address them. This can be done by using the Code Snippets in the HTML5 Canvas - Components - Video folder.
As an advance warning, "seeking" to different locations in an MP4 video the way you described is not as reliable as it was in Flash. Browsers like Internet Explorer don't handle seeking well and will likely crash. If frame -by-frame accuracy is important, you may find the best visual results by avoiding the video component and converting your movie to an actual MovieClip in Animate CC, which will increase your file size significantly.
Related
http://9gag.com/gif used to show the animations as gifs, now they are html5 videos. What is the reasoning behind such a decision?
The reason is simply that video compresses better than gif in many cases, particular when the gif is of some size or length.
Additionally, video can be streamed affecting traffic and when the displaying can start (almost right away), gifs has to be loaded completely before they can be shown (ore they will be shown slowly and progressive).
Now that most browsers are able to show video natively, video becomes a viable and desired option to animated gifs.
i have here a rendered .mov video file with the raw codec and 10 frames per second. The video shows a camera that rotates around a house. If I open this file with the Quicktime Player I can move around the house by dragging the mouse over the video. It's like an interactive video.
Now I want to embed this function in my website with javascript. The problem is that I want to use HTML5 videos, so I have to convert the .mov file into .avi or .mp4.
My Problem is now, if I do that the video laggs when I drag with the mouse over it. Even if I just play it it laggs. How can I convert this video so that I have the same quality as in the original?
Thanks in advance,
conansc
You could try using a GOP length of 1 (also known as using all I-frames). This makes it easier to play backwards. But you might need to just turn it into a series of still images, like JPEGs, and swap them to the screen as needed. Video formats are meant to be played forwards, at normal speed.
I have a problem regarding a video that is not displayed correctly in the video.js player:
http://www.ulrichbangert.de/kakteen/zeitraffer_vjs.php?Idx=10
As you can see from the page source the dimensions of the player are set to 640x480. The video has the same dimensions which I verified by loading it into my local player and displaying the properties. But: At the left and the right of the video there is a gap of some pixels. The poster is displayed correctly without these gaps. This results in an ugly skip when the player switches from the video to the poster. The poster image is the last frame of the video.
Other videos like this one
http://www.ulrichbangert.de/orchid/zeitraffer.php?Idx=1
are playing fine without a skip but I can't find any difference between these and the faulty one.
My browser is Firefox 23.0.1 thus the ogv video is used.
Can anybody help?
Best regards - Ulrich
I am using HTML5 Canvas for rendering video, but the rendering is taking huge amount of CPU? I am using GtkLauncher (with webkit 1.8.0) for rendering the video on the Canvas.
Can some one please throw some light on this? Is video rendering on Canvas not efficient for embedded systems?
Also I would like to know, whether there is a way in HTML5 video tag to know the video frame rate, before I actually start to render the data on the Canvas. This I would need to know because I would have to set the timer (used for drawing the video frames) at that same frame rate .
Thanks and Regards,
Souvik
Most likely the video rendering is not accelerated and needs to
Decode on software
Resize on software
You did not give system details so this is just a guess. By poking browser internals you can dig out the truth.
Video framerate cannot be known beforehand and in theory can vary within one source. However if you host file yourself you can pre-extract this information using tools like ffmpeg and transfer the number in side-band (e.g. using AJAX / JSON).
I want to take a QTMovie that I have and export it with the audio fading in and fading out for a predetermined amount of time. I want to do this within Cocoa as much as possible. The movie will likely only have audio in it. My research has turned up a couple of possibilities:
Use the newer Audio Context Insert APIs. http://developer.apple.com/DOCUMENTATION/QuickTime/Conceptual/QT7-2_Update_Guide/NewFeaturesChangesEnhancements/chapter_2_section_11.html. This appears to be the most modern was to accomplish this.
Use the Quicktime audio extraction APIs to pull out the audio track of the movie and process it and then put the processed audio back into the movie replacing the original audio.
Am I missing some much easier method?
Quicktime has the notion of Tween Tracks. A tween track is a track that allows you to modify the properties of another set of tracks properties (such as the volume).
See Creating a Tween Track in the Quicktime docs to see an example of how to do this with an Quicktime audio track's volume.
There is also a more complete example called qtsndtween on the Apple Developer website.
Of course, all of this code requires using the Quicktime C APIs. If you can live with building a 32-bit only application, you can get the underlying Quicktime-C handles from a QTMovie, QTTrack, or QTMedia object using the "movie", "track", or "media" functions respectively.
Hopefully we'll get all the features of the Quicktime C APIs in the next version of QTKit, whenever that may be.