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Essentials of DVD Production
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Tips and Tricks The following tips will help you with the authoring process:
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Make sure you have more hard disk storage space than you think you could possibly need; DVD assets take up huge amounts of space The first time you have to suspend a project because of a bottleneck and start work on a different project, you will either be driven mad by the amount of time it takes to offload a project to tape, or you will be glad you have the disk space needed to work on another project on the same station If you must do a layer change in the middle of the video, look for slowmoving pictures, a still, or a fade to black The secret to a smooth transition is low data rate, which gives more time to the DVD player to refocus on the second layer before the buffer underflows At the encoding stage, make the data rate as low as possible for a few seconds going into the layer change, as well as a few seconds coming out of the layer change
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Formatting and Output
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Once the authoring process is complete and everything works in simulation, it s time to create the final disc image The authoring system will multiplex all the assets together, adding navigation and control information according to the DVD specification, and it will write out a special set of VOB, AOB, IFO, and BUP files in a VIDEO_TS directory (for DVD-Video or DVDAudio discs with video) or an AUDIO_TS directory (for DVD-Audio-only discs) You will often end up going through this step more than once after finding a problem during emulation or when testing with a DVD-R test disc The data files can be written to a hard drive This is useful for emulation testing, where you use a computer software player to test for problems that don t show up when simulating the disc in the authoring system The data files can be written to DVD-R (or other writable DVD media) using the UDF bridge format This creates a fully functional DVD disc that can be tested on standard players and other computers Once everything is working perfectly, the output can be directed to digital linear tape (DLT) The disc image is written as an ANSI tape file, along with a DDP control file that includes additional information to be used by the replicator All DVD replicators accept compact DLT type III or type IV in DDP 20 format Some replicators will also accept DVD-Rs (which they
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usually turn around and write to DLT) Discs to be protected with CSS or CPPM must be submitted on DLT, since DVD-Rs have only 2048-byte sectors without extra header information A dual layer disc takes two DLTs Only one layer can be written per tape
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Testing is the most important factor in the success of a project If you work with clients, quality control is vital to your reputation Testing should never be left to the end; it must be an ongoing process from the beginning The first testing stage is source asset checking Never assume that your supplier will get it right QC all incoming assets, at least until you have verified which suppliers you can rely on to always get it right Although it seems like a redundancy and drain on time and resources, it will save you money and time in the long run Screen all incoming assets for quality and accuracy View every video tape and encoded video file Audition all audio tapes and audio files View every graphic and subpicture file, checking for spelling mistakes and missing elements If you can t check foreign language subtitles, make sure the supplier guarantees accuracy and takes responsibility for costs associated with reauthoring the disc in case of subtitle errors Check timecodes and synchronization between audio and video and between subtitles and video Review video and audio during and after compression Check encoded audio against the master to spot sync, level, and equalization problems Check all text before it goes to the graphic artist Provide text to the graphic artist as text files that they copy and paste (or otherwise import) into the graphics application Do not let them type text they always misspell If you work with clients, have the client proof and sign off on all the prepared assets (video, audio, and graphics) before authoring Check navigation, layout, and general functionality with the simulation features of the authoring system Don t worry about audio and video quality checking at this point, since simulation is not accurate enough After outputting formatted files, do emulation testing with computer software players At this point, check whether the computer has reliable playback, and QC video and audio, especially synchronization Since the computer displays the video in progressive mode, this is a good time to check for unanticipated effects of progressive display Also be sure to check menu functionality, since the mouse-based user interface changes the way things work Emulation testing can catch errors before you spend the time and expense of writing a DVD-R for further testing
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