2009. 02. 22, vasárnap keltezéssel 23.35-kor Michael Riepe ezt írta: > 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. >
Nice! > 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. > Concerning teletext, AFAIK the ivtv cards are capable to embed VBI in the MPEG stream (but I never tried this). > 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. > I am eagerly waiting a release (or a SVN tree). Keep up the work and thank you a lot for your efforts! Once there is something out, I would be pleased to test it and report my observations. Levente ------------------------------------------------------------------------------ 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
