Hi, I have a number of VOB files which all feature the same strange behaviour. After a certain period, the pts/dts timestamps on the packets reset to almost zero.
For example: 933, 375121777, 0000/01/01 00:00:37.512, 373200000, 1921777 934, 375521777, 0000/01/01 00:00:37.552, 373600000, 1921777 935, 375921777, 0000/01/01 00:00:37.592, 374000000, 1921777 936, 4751111, 0000/01/01 00:00:00.475, 374400000, -369648889 937, 5151111, 0000/01/01 00:00:00.515, 374800000, -369648889 938, 5551111, 0000/01/01 00:00:00.555, 375200000, -369648889 The columns are sample index, reported pts (from av_read_frame), formatted pts, predicted pts, difference. The predicted pts is simply the sample index multiplied by 40ms (I'm assuming 25fps video). Time basis is in 100ns ticks. The small difference (19221777) is due to the fact that I'm incorrectly assuming a zero timestamp for the first frame. My best guess is that this stream was produced by concatenating two streams, and failing to fix up the time stamps. Does that sound reasonable? Is there any way I can use lavformat/lavutil/lavcodec to correct this problem, *without* tracking the sample index myself? (I want to be able to produce corrected timestamps following an arbitrary seek.) Note: When these files are played in something like VLC, the timestamps are wrong (VLC's time indication stops incrementing past the 37s point in this example.) However, if I use VLC to load the VIDEO_TS folder, the time indication is correct. This is probably the wrong mailing list, but: how is VLC determining the correct time? Many thanks, Rob Sira Defence & Security Ltd - Registered Office: York House, 74-82 Queen Victoria Street, London, EC4N 4SJ - Registered in England and Wales - Company number 05589861 CONFIDENTIALITY NOTICE: This email message, and any accompanying attachments, is for the sole use of the intended recipient(s) and may contain information that is classed as Company-in Confidence. If you are not the intended recipient, you are notified that any use, dissemination, distribution or copying of this message and any accompanying attachments, is prohibited. If you received this email message in error, please notify us immediately and erase all copies of this message and attachments. Please note that Sira Defence & Security Ltd monitors incoming and outgoing mail for compliance with its Email Policy. This will include scanning incoming and outgoing emails to detect viruses and any spam mail. _______________________________________________ libav-user mailing list libav-user@mplayerhq.hu https://lists.mplayerhq.hu/mailman/listinfo/libav-user
