Subtitle (captioning) The texts are displayed on the screen to: Support people of different language ordisable to hear. May contain effects to make themovie/music video more attractive.
Types of subtitle Real-time captioning: are created andadded during live broadcasts or events. Offline captioning: are created andadded after a production has beenrecorded and before it is aired or played.
Soft• Separate subtitle file.• Located at the samefolder with video file.Built- in• Embedded into videofile.• Users can switch onand off.Hard• Embedded into videofile.• Appeared concurrentlywith video file
Soft subtitle Frame rate: how fast a new still image isavailable, measured in frame per second.Clip: Flip book animation Character encoding: ASCII: American Standard Code forInformation Interchange, based on Englishalphabet. UTF-8: UCS Transformation Format-8 bit:represent characters in the Unicodecharacter set.
Processing video file Sampling and quantization. Bit depth: the number of possible levels. Aspect ratio: ratio of the width of the pictureto the height (e.g.: 4:3; 16:9, etc.) Frame size/resolution: is measured in pixeldimension of a frame (e.g. 720x576 pixels). Video compression: the process of convertingdigital video into a format suitable fortransmission or storage which contains a smallamount of bits.
Video conversion The process of preparing the video foroutput, where the digital video isencoded to meet proper formats andspecifications for recording and playbackthrough the use of video encodersoftware. E.g.: convert from .mkv movie file to .avimovie file.
Pixel aspect ratio Digital image editing: use square pixels bydefault, some video formats use non-squarepixels to make up the frame. Pixel aspect ratio: The ratio of pixel’s widthto its height. Square pixel: 1 Standard Digital Video format: 0.9 Wide-screen Digital Video format: 1.2 Width: height = 720 x 1.2 : 480 ~ 852 : 480 ~ 16:9
Counting time Timecode: is used to number frames. SMPTE (Society of Motion Pictures andTelevision Engineers) video timecode, themost common timecode for digital video,numbers frames in hours, minutes,seconds, and frames. Timing:
Hardware for encoding Minimum: Pentium IV 2.0 Ghz, RAM 512MB, card onboard. Suggest: Intel celeron, RAM 1GB 3.0 Ghz,card 8500GT. Ideal: Intel Core 2 Duo 3.0 Ghz (x2), RAM2GB, card Gefore 9600 GT or above.
Software requirements Directly add subtitles while editing movie:Adobe Premier, Magix Movie Editor, ProShowProducer, etc. Timing and typesetting: Aegisub, SubtitleWorkshop, etc. Encoding video: MeGUI, VirtualDub, StaxRip,etc. Other tools to read and process different videoformats: Avisynth, K-Lite Codec Pack, .NETFramework, NerAacEnc etc.
Subtitle configuration What you can do with subtitle? Shift time to fit the original movie. Turn on and off with built-in subtitle:Youtube Close Caption, television. Add effects (Typesetting).
Example Remember when (“Up” OriginalSoundtrack)
References Wong, Y.-L. (2009). Digital Media Primer: Digital Audio,Video, Imaging and Multimedia Programming. UpperSaddle River (NJ) : Pearson, Prentice-Hall. Berke, J. (2010, 26 2). Deafness. Retrieved 2 19, 2012, fromAbout.com. Peters, O. (2003, December 18). A Different Drummer -Understanding Frame Rates and Timecode. RetrievedJanuary 13, 2012, from digitalfilms.wordpress.com. Typesetting. (n.d.). Retrieved December 13, 2012, fromAegisub Manual. How to add Subtitles to your videos on YouTube (easy)1080p HD
References Richardson, I. (2010, May). H. 264 Advanced VideoCompression Standard. (2). Hoboken, New Jersey,USA: Wiley. Clark, J. (1994, July). Reading the silver screen.Technology Review. Jack, K. (2008). Digital Video and DSP. Elsevier Inc. Nowlin, D. (2009, June 19). Video Frame DisplaySynchronization. Retrieved January 13, 2012, fromIntel. Silva, R. (2012, January 13). Video Resolution - AnOverview - What You Need to Know About VideoResolution. Retrieved January 13, 2012, fromAbout.com Guide.