v = VideoReader(filename,Name,Value) sets the properties CurrentTime, Tag, and UserData using name-value arguments. For example, VideoReader('myfile.mp4','CurrentTime',1.2) starts reading 1.2 seconds into the video. You can specify multiple name-value arguments. Enclose each property name in single quotes followed by the corresponding value.
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On some platforms, when you create a VideoReader object, the 'CurrentTime' property might contain a value close to, but not exactly, zero. This variation in the value of the 'CurrentTime' property is due to differences in how each platform processes and reads videos.
Read the 20th frame from the video by specifying the frame index. Then, display the value of the CurrentTime property. The read method automatically updates the CurrentTime property to reflect that the 20th frame has been read. At this step, a call to the readFrame function would return the 21st frame.
Read the remaining frames of the video using the readFrame method. The readFrame method returns the frame corresponding to the time in the CurrentTime property. For instance, this code reads and displays the frames starting at the 21st frame and continues until there are no more frames to read.
For some AVI, MOV, or MP4 files on Windows, using the readFrame function to read all of the frames in the file can result in a different number of frames than the value returned by the NumFrames property of the VideoReader object.
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Rendering is the creation of the frames of a movie from a composition. The rendering of a frame is the creation of a composited two-dimensional image from all the layers, settings, and other information in a composition that makes up the model for that image. The rendering of a movie is the frame-by-frame rendering of each of the frames that make up the movie. For more information on how each frame is rendered, see Render order and collapsing transformations.
It is common to speak of rendering as if this term only applies to the final output. However, the processes of creating previews for the Footage, Layer, and Composition panels are also kinds of rendering. In fact, it is possible to save a preview as a movie and use that as your final output. See Preview video and audio.
You need a high-quality movie (with or without an alpha channel) or image sequence that will be placed in a Premiere Pro sequence or used in another video editing, compositing, or 3D graphics application.
For the Render Queue, After Effects uses an embedded version of the Adobe Media Encoder to encode most movie formats through the Render Queue panel. When you manage to render and export operations with the Render Queue panel, the embedded version of the Adobe Media Encoder is called automatically. The Adobe Media Encoder appears only in the form of the export settings dialog boxes with which you specify some encoding and output settings. See Encoding and compression options for movies.
You do not need to render a movie multiple times to export it to multiple formats with the same render settings. You can export multiple versions of the same rendered movie by adding output modules to a render item in the Render Queue panel.
Select the triangle to the right of the Output Module to choose an output module settings template, or select the underlined text to the right of the Output Module to customize the settings. You use the output module settings to specify the file format of the output movie. In some cases, a format-specific dialog box opens after you choose a format, in which you can choose format-specific settings. If you have new preferences as opposed to upgraded or imported preferences, the output module default is set to High Quality.
You can use different encoding and compression schemes for different phases of your workflow. For example, you may choose to export a few frames as full-resolution still images (for example, TIFF files) when you need approval from a customer about the colors in a shot; whereas you may export the movie using a lossy encoding scheme (for example, H.264) when you need approval for the timing of the animation.
Output module settings apply to each render item and determine how the rendered movie is processed for final output. Use output module settings to specify file format, output color profile, compression options, and other encoding options for final output.
You can also use output module settings to crop, stretch, or shrink a rendered movie; doing this after rendering is often useful when you are generating multiple kinds of output from a single composition.
You can apply multiple output modules to each render item, which is useful when you want to make more than one version of a movie from one render. For example, you can automate the creation of a movie and its alpha matte, or you can create high-resolution and low-resolution versions of a movie.
You can choose a custom output module settings template or one of the preset output module settings templates. Several templates are provided, including the Lossless template for creating movies for transfer to video, film, or an NLE system.
The output channels are contained in the output movie. After Effects creates a movie with an alpha channel if you choose RGB+Alpha, implying a depth of Millions of Colors+. Not all codecs support alpha channels.
Specifies the size of your output movie. Select Lock Aspect Ratio To if you want to retain the existing frame aspect ratio when resizing the frame. Select Low Resize Quality when rendering tests, and select High Resize Quality when creating a final movie. See Scaling a movie down and Scaling a movie up.
Used to subtract or add rows or columns of pixels to the edges of the output movie. You can specify the number of rows or columns of pixels to be added or subtracted from the top, left, bottom, and right sides of the movie. Use positive values to crop, and use negative values to add rows or columns of pixels. Select Region Of Interest to export only the region of interest selected in the Composition or Layer panel. See Region of interest (ROI).
Compression is essential for reducing the size of movies so that they can be stored, transmitted, and played back effectively. Compression is achieved by an encoder; decompression is achieved by a decoder. Encoders and decoders are known by the common term codec. No single codec or set of settings is best for all situations. For example, the best codec for compressing cartoon animation is generally not efficient for compressing live-action videos. Similarly, the best codec for playback over a slow network connection is generally not the best codec for an intermediate stage in a production workflow. For information on planning your work with the final output in mind. See Planning your work.
After Effects uses an embedded version of the Adobe Media Encoder to encode most movie formats through the Render Queue panel. When you manage render and export operations with the Render Queue panel, the embedded version of the Adobe Media Encoder is called automatically. The Adobe Media Encoder appears only in the form of the export settings dialog boxes with which you specify some encoding and output settings.
In QuickTime terminology, the term key frames refers to something different from the change-over-time keyframes placed in the Timeline panel. In QuickTime, key frames are frames that occur at regular intervals in the movie. During compression, they are stored as complete frames. Each intermediate frame that separates them is compared to the previous frame, and only changed data is stored. Using key frames greatly reduces movie size and greatly increases the memory required to edit and render a movie. Shorter intervals between key frames enable faster seeking and reverse playback, but can significantly increase the size of the file.
Use the Import & Replace Usage option to create a chain of dependent render items. For example, you can set one render item to use a watch folder and multiple computers to create a still-image sequence, and then the next render item can render a single movie file from that still-image sequence. See Network rendering with watch folders and render engines.
Sound media is used to store compressed and uncompressed audio data in QuickTime movies. It has a media type of 'soun'. This section describes the sound sample description and the storage format of sound files using various data formats.
All extensions to the SoundDescription record are made using atoms. That means one or more atoms can be appended to the end of the SoundDescription record using the standard [size, type] mechanism used throughout the QuickTime movie architecture. Extensions were first added with sound sample description v1.
If a timed metadata track includes a key in the metadata sample description but has values using the key in associated media samples, the metadata sample description can still be rewritten to eliminate the key from the metadata key table atom. While the metadata values remain in associated media samples, the data is no longer reachable because the key is now gone. Care should be exercised if the values should themselves be removed from the movie file. Although not a requirement, the remaining but now unreachable data can be removed by copying only referenced metadata values when copying media samples to a new track.
There is a potential conflict if more than one metadata value of the same type is in the metadata tracks. In this case, the layer of the metadata tracks should be used to establish which should be used. Tracks with lesser layer values (that is, -1 is less than 0) take priority and their metadata values should be used. If two tracks have the same layer value, the last track in movie track order (the order of 'trak' atoms in the 'moov' atom) shall override metadata values from tracks earlier in order. 2ff7e9595c
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