[nut]: r512 - docs/draft-niedermayer-nut-00.xml
Author: lu_zero Date: Sun Oct 28 16:28:21 2007 New Revision: 512 Log: slightly less broken grammar Modified: docs/draft-niedermayer-nut-00.xml Modified: docs/draft-niedermayer-nut-00.xml ============================================================================== --- docs/draft-niedermayer-nut-00.xml (original) +++ docs/draft-niedermayer-nut-00.xml Sun Oct 28 16:28:21 2007 @@ -101,8 +101,8 @@ synchronous 1-in-1-out decoder. </t> <t hangText="frame"> Minimal unit of information that can be - decoded, it is usually holds a video frame, a group of - audio samples or a subtitle line. + decoded, e.g. a video frame, a group of audio samples or a + subtitle line. </t> <t hangText="Keyframe"> A keyframe is a frame from which you can start decoding.
On Sun, Oct 28, 2007 at 04:28:22PM +0100, lu_zero wrote:
Author: lu_zero Date: Sun Oct 28 16:28:21 2007 New Revision: 512
Log: slightly less broken grammar
Modified: docs/draft-niedermayer-nut-00.xml
Modified: docs/draft-niedermayer-nut-00.xml ============================================================================== --- docs/draft-niedermayer-nut-00.xml (original) +++ docs/draft-niedermayer-nut-00.xml Sun Oct 28 16:28:21 2007 @@ -101,8 +101,8 @@ synchronous 1-in-1-out decoder. </t> <t hangText="frame"> Minimal unit of information that can be - decoded, it is usually holds a video frame, a group of - audio samples or a subtitle line. + decoded, e.g. a video frame, a group of audio samples or a + subtitle line.
It's not always the minimal unit capable of being decoded. For instance with pcm audio and uncompressed video, it's not a single sample, and with slice-based video codecs it's not a slice. It's roughly "the unit of decoding corresponding to a single presentation moment" but this is also incorrect (audio, interlaced video). Writing a general definition is just error-prone, imo. The broken-down definition is, I think: - noninterlaced video: the unit of data corresponding to exactly one moment of presentation; the common notion of a video frame. - interlaced video: the unit of data corresponding to either one moment of presentation, if the encoded format is divisible into single-field units, or two moments of presentation implicitly separated in time by a codec-defined interval if the encoding uses indivisible paired-field storage. - packetized audio: if the encoding of audio has nontrivial minimal units of decoding, the minimal decodable unit - continuous audio: if the encoding of audio does not have nontrivial minimal units of decoding, an implementation- or user-chosen number of samples that need not be constant. - subtitles: any atomic change in the presentation. examples include adding or removing one or more lines, change in formatting, clearing all subtitles, etc. These may contain some errors. Feel free to discuss. I just wrote them off the top of my head. Rich
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Rich Felker