Hi! The list may be quiet, but there are things going on behind the curtains. I've been working on a new indexer for dvbcut2 now for a while, and things look pretty good. The new code will not only be able to detect AC-3 (and Enhanced AC-3) audio tracks in MPEG transport streams more easily (and more reliably), I also have basic support for MPEG-4 AVC (aka H.264) video already.
My new MPEG-2 video indexer recognizes the use of closed captions (which are transmitted inside the video stream in ATSC). I don't know how to decode the data, however. DVB and teletext subtitles are better documented, but I haven't seen any streams that actually used them. DVD subtitles are yet another story. At least I found a somewhat complete format description somewhere on the net. The questions remain, however, which output format dvbcut2 should use, and how to convert all the different input formats to that single output format. Maybe an internal intermediate format will help with that. Since a subtitle essentially is a partially transparent image (with a timestamp and a duration attached to it), something like PNG might be appropriate. The jury is still out on other audio formats. DTS, Advanced Audio Coding (AAC), MPEG Lossless Coding and LPCM come to mind, but they aren't exactly used very often in Europe (Region 2 DVDs usually contain MPEG and AC-3 audio, and I haven't dealt with Blu-ray yet). Does any DVB or ATSC station in the world broadcast one of these formats? I'm currently working with MPEG transport streams as the container format because that's the hardest part. Adding support for program streams (including DVD VOB files) later will be relatively easy. Since the code I have so far is modular by design, it may also be possible to add support for, say, AVI files. By the way: there's a huge difference between the way dvbcut handles data and the way dvbcut2 will. dvbcut2 will be "data driven", that is, you set up a processing pipeline and then push the data through it. It should also be possible to run the pipeline in the background, in another thread. Maybe you can also assign particular parts of it to separate threads (e.g. to process audio and video in parallel). That way we might get a little more performance on the now-common multi-core machines. -- Michael "Tired" Riepe <mich...@mr511.de> X-Tired: Each morning I get up I die a little ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ DVBCUT-user mailing list DVBCUT-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dvbcut-user
