View Single Post
Old 10-12-2003, 06:30 AM   #12 (permalink)
Scorpion23
Psycho
 
Scorpion23's Avatar
 
Sorry about the confusion.
damhna: You are correct about not being able to access the file system directly. A program is needed (Premiere) to pull the movie off the camera and onto the computer.

The thing that makes miniDV, DV, and DVpro great is that the camera takes the digital signal coming from the CCD, and converts it into a digital video file with the DV format using encoding hardware in the camera. This file is a constant 3.5Mbits/sec. in bandwidth. This results in a digital video file recorded onto a video tape in much the same way as computer systems use tape drives, they can store a lot of information but must be accessed linearly. In this way a miniDV tape can hold about 13GB of data. This differs from traditional camcorders, which record an analog signal onto the tape.

Since the miniDV tape is in a digital format it allows for lossless data transfer to another camcorder, computer, etc. as long as a digital transfer method such as Firewire is used.
Although the video file on the tape is in digital format, it must still be accessed through a program such as premiere in order to transfer it to a computer. However, since the file is already digital the computer only has to write it to the hard drive as it comes in from the camera. This is why you must have a HD capable of sustained write speeds >3.5Mbits/sec.. A slower write speed will result in errors since the miniDV tape transfers data at a steady rate and can’t recover from lag in the same way as a HD. This process is referred to as capturing.

When you capture an analog video file the computer must use considerable CPU time to convert the analog signal into a digital file, as well as write to the HD at a constant speed. This can cause dropped frames, lower quality video, and a host of other problems.

damhna’s method of capture in Premiere is the standard way to do it. Settings located elsewhere in the program determine what format it expects the file to be in, although if your Firewire cable is hooked up and you’re seeing video then it’s a digital transfer.

In short, the media on a miniDV tape is a digital file, although it must be accessed through a proxy program such as Premiere in order to transfer it to the computer.
And miniDV with digital transfer is superior to analog in every way I’ve seen.

I hope I’ve cleared up any questions, I’ll post some links to a few guides on miniDV and DV editing when I get back to my apartment tonight.
__________________
"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
Scorpion23 is offline  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360