Sample files are available at http://ge.tt/9Ov8eNN On Sat, Sep 8, 2012 at 1:04 PM, Jeff Richman <[email protected]>wrote:
> I was hoping someone might be able to help with a remuxing issue I've > recently encountered. > My basic process is this; while converting my DVDs to digital files for > play through a WDTV media player, I start by extracting the vob file using > K9Copy, and then I subsequently remux that file through avconv (previously > ffmpeg) into the same container format. I perform the remux because it has > helped correct an issue where the video length is incorrectly reported in > the intial vob file. This is the command I use to remux the file: > avconv -i <inputFile>.vob -map 0:0 -codec:v copy -map 0:1 -codec:a copy > -f dvd <outputFile>.mpg > After rebuilding my computer recently and installing the latest copy of > Xubuntu (11.10), all of my remuxed files have become jittery even though > I'm performing the exact same steps the same way. I'm assuming that it's a > result of a newer version of avconv (or ffmpeg, as the result is the same > in either), but I can't seem to figure out a fix. > The jitter is most obvious in Windows Media Player or playback on my > WDTV box. It seems to be automatically corrected by Xine or Mplayer, > although there is still evidence that something isn't in sync between the > video and audio. In my best guess, it seems that video frames are being > dropped even though I'm performing a simple stream copy. The jitter is more > pronounced the longer and larger the file is. > I'll follow up with two emails with video samples (too big to attach in > a single email). Video_01_Smooth.vob is an example of a smooth vob file and > Video_02_Jittery.mpg is a remuxed mpg showing the jitter created as a > result of the remux. > One final note, I can "fix" the jittery file by running the following > command, but than I loose the audio in the process: > avconv -i Video_2_Jittery.mpg -map 0:0 -codec:v copy -f mpeg2video > Video_2_Jittery_NEW.mpg > Any thoughts? > Jeff >
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