Tehnici audio video

Mihai Onia

Evoluie?

Evoluie?

Recepie

Emisie

Transmisie video digital

Eantionare Cuantizare

Byte-bii Valori posibile1 byte (8 bii) 256 (28)2 bytes (16 bii) 65 535 (216)4 bytes (32 de bii) 232

8 bytes (64 de bii) 264

Transmisie video digital

Eantionare temporal i spaial a imaginii

Eantionarea i cuantizarea sunetului

Spaii de culoare

Standarde

SD TV - PAL

Rezoluii HD - SDDenumire Rezoluie Raport aspect

NTSC-M (SD) 720480 3:2

PAL-I (SD) 720x576 5:4

HD Ready 1280x720 16:9

full HD 1920x1080 16:9

4K 3840x2160 16:9

8K 76804320 16:9

Producie

Compacte: Point - and - Shoot

Bridge

DSLR (Digital Single Lens Reflex)

Producie

Achiziie - editare

Compresie i distribuie video

Formate audio-video

Format - container (wrapper) aduce impreuna mai multe tipuri de date (date audio -video, subtitrare, metadata)

Audio: WAV, AIFF, MP3 Video AVI, MOV, MP4, M4V,

MPG, VOB, FLV, WMV, MKV, RM, 3GP, WebM, M2TS, MXF

Codecuri

COder-DECoder - cu pierderi / fara pierderi Exemple de codecuri video: DV, MPEG4-H264,

MPEG2, VC-1, WMV9, VP6, DivX, XVID, MJPEG Audio: AAC, MP3, PCM SCOPUL CODECULUI

editare sau distributie?

Transcodare Transcodare conversia fisierelor video Softuri profesionale: Adobe Media Encoder,

GrassValley Procoder, Rhozet Carbon Coder Softuri gratuite: MediaCoder,

AnyVideo Converter, Super, VLCz

http://www.dvdvideosoft.com/free-dvd-video-software.htmhttp://www.wondershare.com/http://www.any-video-converter.com/products/for_video_free/http://mediainfo.sourceforge.net/enhttp://www.xilisoft.com/video-converter.html

Parametrii de codare

Rata de bit (Bit Rate) VBR sau CBR

Rezoluia video (Video Frame Size)

Raport de aspect - imagine si pixel (Aspect Ratio)

Cadre pe secunda (fps) (video frame rate)

Adncimea de bit (Bith Depth)

Numr de canale audio (Audio Channels)

Rata de eantionare (Sampling Rate)

Broadcast TV (SD)

Container video: MPG, MP4Cadre pe secund: 25fpsRata de bit: 2-8 MbpsRezoluie: 720 x 576Raport de aspect: 16:9

IPTV(HD)

Container video: MP4Cadre pe secund: 25fpsRata de bit: 2-13 MbpsRezoluie: 1280 x 720, 1920 x 1080Raport de aspect:16:9

DVD

Container video: VOBCadre pe secund: 25fpsRata de bit: variabil 0 - 7 MbpsRezoluie: 720 x 576Raport de aspect: 4:3 sau 16:9

Blu-Ray

Container video: M2TS - MPEG Transport StreamCadre pe secund:

Web video - Youtube

Container video: FLV, MP4Cadre pe secund: 25-30fpsRata de bit: 0,3 - 1 MbpsRezoluie: 320 x 240, 480 x 360, 640 x 480, 1280 x 720, 1920 x 1080

Raport de aspect: 4:3 sau 16:9

iPhone

Container video: MP4Cadre pe secund: 25fpsRata de bit: ~1 MbpsRezoluie: max 1136 x 640

Tehnici audio videoEvoluie?Evoluie?Slide Number 4Transmisie video digitalTransmisie video digitalSpaii de culoareStandardeSD TV - PALRezoluii HD - SDProducieProducieSlide Number 13Compresie i distribuie videoFormate audio-videoCodecuriTranscodareSlide Number 18Parametrii de codareBroadcast TV (SD)IPTV(HD)DVD Blu-RayWeb video - YoutubeiPhoneSlide Number 26