an alle filmfreaks, divx5-ac3 |
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an alle filmfreaks, divx5-ac3 |
15 May 2003, 15:14
Beitrag
#1
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Weltensegler Gruppe: Members Beiträge: 203 Mitglied seit: 3-May 03 Wohnort: Tirol - Ibk Mitglieds-Nr.: 1.647 |
so steh wieder mal am ende meiner weisheiten...
so als erklärung der film beinhaltet 2 sprachen deutsch englisch. ich hab probiert den film mit dem divx player anzusehn da schreibt er mir ne meldung the file contains unknown audio data... dann kann ich auswählen: stop playback oder play video only... (bei play video only spielt er mir den film ohne ton) was kann bzw. muss ich beachten bzw. machen damit ich den film mit ton höre... filename Good.Fellas-ger+eng-1of2-DivX5-AC3--DVDrip.avi (keina ahnung für was ac3 steht) lg devilrocker |
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16 May 2003, 12:04
Beitrag
#2
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da best hardware moderator ever:-) Gruppe: Members Beiträge: 5.479 Mitglied seit: 19-April 02 Wohnort: vienna rulez ! Mitglieds-Nr.: 120 |
1. Introduction
AC-3 is a high quality audio codec designed to encode multiple channels of audio into a low bit-rate format. AC-3 achieves its large compression ratios via encoding a multiplicity of channels as a single entity. Dolby digital, which is a branded version of AC-3 encodes up to 5.1 channels of audio. AC-3 has been adopted as an audio compression scheme for many consumer and professional applications. AC-3 is the mandatory codec for DVD- video, ATSC digital terrestrial television, laser disc, and DVD-audio (as an optional multichannel audio format). AC-3 is also a common audio format for film. Presently there exists a tremendous amount of content encoded in AC-3. The majority of AC-3 content is comprised of more then two channels. It is highly likely that people may wish to stream AC-3 data over computer networks. Applications for streaming AC-3 range from video on demand to multichannel Internet radio. RTP provides a mechanism for stream synchronization and hence serves as the best transport solution for AC-3, which is a codec primarily used in audio for video applications. The RTP payload described in this document also provides a method of ensuring a continuous high quality AC-3 stream. 1.1 Overview of AC-3 AC-3 can deliver upwards of 5.1 channels of audio at data rates approximately equal to half of one PCM channel [2], [3], [4]. The ".1" refers to a band limited optional low-frequency enhancement channel. AC-3 was designed for signals sampled at rates of 32, 44.1, or 48 kHz. Data rates can vary between 64 kbps and 640 kpbs depending the number of channels and desired quality. AC-3 exploits psychoacoustic phenomenon that reveal large amounts of inaudible information contained in a typical audio signal. Substantial data reduction occurs via the removal of all inaudible information contained in an audio stream. Source coding techniques are further used to reduce the data used to code an audio signal. Like most perceptual coders, AC-3 operates in the frequency domain. A 512-point TDAC transform is take with 50% overlap, providing 256 new frequency samples. Frequency samples are then converted to exponents and mantissas. Exponents are differentially encoded. Mantissas are allocated a varying number of bits depending on the audibility of the spectral component associated with it. Audibility is determined via a masking curve. Bits for mantissas are allocated from a global bit pool. |
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