Here is the info: # isoinfo -d dev=/dev/sr0 CD-ROM is in ISO 9660 format System id: Volume id: ARV_NT5.1_DES Volume set id: UNDEFINED Publisher id: Data preparer id: Application id: Copyright File id: Abstract File id: Bibliographic File id: Volume set size is: 1 Volume set sequence number is: 1 Logical block size is: 2048 Volume size is: NO Joliet present **BAD RRVERSION (0) NO Rock Ridge present
Once I mount the drive: # mount -t iso9660 /dev/sr0 /sr0 mount: /dev/sr0 is write-protected, mounting read-only # du -sk /sr0/video_ts/ 25253528 /sr0/video_ts/ Since that is in number of k's (1024 bytes) echo "25253528 * 1024" | bc 25859612672 25859612672 So how did a 4GB volume expand into 25GB? if we assume that the reported volume size is 4096640 2K blocks: 4096640 * 2048 = 8389918720 Which is easily contained in a double density DVD optical medium. Was there an mp4 compression used such that the driver performs a conversion to VOB before handing over the data to the user process??? Just curious!!! On Tue, Sep 24, 2019 at 8:22 AM Ted Park <[email protected]> wrote: > > At anyrate, I use dd to copy the dvd to HD. > > On HD, the size of the iso file (after copying SOME dvd's) > > is in excess of 20GB. such as 22GB+, 26GB+...etc > > > > Could someone explain why this is? > > > > I thought dvd's have capacities of 4.7GB, 8.9GB for double density. > > I also know about dvd's that have slightly more than 10GB capacity. > > dd doesn’t know about any of that. Your dvd drive might handle the copy > protection in a way that causes this, or it might be the driver (did you > use srX or dvd device? Might not matter) > > Usually you determine how many blocks you want and the block size, using > isoinfo for example, before you dd from a cd/dvd drive so you know how big > the image is going to be before you start. But your case is interesting, > more often you’ll get a smaller file when content scrambling is the culprit > due to the read erroring out along the way, is the resultant image file > usable? > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
