Tom Metro wrote: > Tom Metro wrote: >>> ...and whether the "harddup video filter" documented here: >>> http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-dvd-mpeg4.html#menc-feat-dvd-mpeg4-muxing-filter-issues >>> >>> helps... >> I'm not entirely convinced that this filter even did anything, and that >> there was a difference from the prior transcodes I did with no audio >> sync options. One thing that makes me skeptical is that I still saw the >> warnings about skipped frames (same as with no options), and never a >> warning about a frame being added. I also am not sure that mencoder >> applies video filters when you are using the copy codec. >> >> I'll have to test more files, and see if there is any difference in the >> file size between a run with "-vf harddup" and a run without. In theory, >> they should be different. > > My test showed: > > 683241472 2010-04-11 20:13 2061_20100408233000-hard.mpg > 683241472 2010-04-11 20:49 2061_20100408233000.mpg > > Identical file size suggests the filter does nothing. I couldn't find > anything in the man page or user guide explaining whether filters > applied to the 'copy' codec, but the built-in help text says: > > % mencoder -ovc help > Available codecs: > copy - frame copy, without re-encoding. Doesn't work with filters. > > So that answers that question. > > I don't entirely understand why this is the case, as mencoder should > still be dissecting the stream enough to be able to add frames. This is > implied by its warnings that it is dropping frames. > > While doing a video transcode should correct this, I don't know whether > the loss in quality and time needed for the transcode warrant the slight > improvement in sync. > > I also experimented with -noskip, -audio-density, -audio-preload, and > dropping the audio bitrate, and none has produced any better results. > > I guess I'll have to post to the mencoder user's list to see if someone > with an understanding of mencoder internals can offer advice. > > -Tom
I have a single channel that started being way out of sync, all of the other channels that I have seem to stay in sync (or at least around .1 seconds off or so), but this one gets 30+ seconds out of sync...and that is with a full video+audio trancode. Not sure of the cause, I am going to have to record a sample and keep it and see why it fails. That is one of the reason my script was so large, each broadcaster seems to put out different audio+video stream, so you need lots of special cases, there are probably a few more cases that I have not seen once someone includes in the various cable broadcasters that reformat into their own bizarre streams and resolutions. ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Mvpmc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mvpmc-users mvpmc wiki: http://mvpmc.wikispaces.com/
