Isn't the simple solution to just not change the encoding profiles? We opt for multiple encoding processes to run concurrently rather than supporting multithreading in a single encoding job. We can stick with that approach.
With all of this said, we are planning on cutting 1.2 in about a week. I'm fine waiting until that release branch is cut, so the new features are released as part of 1.3. Josh On Thu, May 5, 2011 at 6:54 AM, Christopher Brooks <[email protected]>wrote: > I disagree. While it might be likely that we won't run into problems there > is still a lot of work that needs to be done to verify that when we change > such an important third party tool. Your comment on multithreading > demonstrates the potential for subtle 'improvements' to cause issues if > untested; if our ffmpeg profiles use multithreading and we're on a 4 core > worker with four jobs in the encoding stage how many threads are actively > vying for cpu? 4 or 16? Which is our intent? > > I'm a -1 on upgrading ffmpeg for the 1.2 release unless there is going to > be a significant qa effort on the processing side. I would love an updated > ffmpeg, but I want to know someone is going to verify that it works as > expected throughout. > > Chris > -----Original Message----- > From: Ruediger Rolf <[email protected]> > Date: Thu, 05 May 2011 09:34:49 > To: Christopher Brooks<[email protected]> > Cc: Opencast Matterhorn<[email protected]> > Subject: Re: [Opencast Matterhorn] Multi quality streams workflow > definition: > update ffmpeg version for 1.2? > > I don't think that changing the ffmpeg version is something that need > many QA work. For 1.0 and 1.1 we always used a ffmpeg trunk version (to > get the -vf option). I have never encountered a problem with the ffmpeg > version with matterhorn. > > By the way the recent versions have a better multi-threading support, > just as an additional bonus for switching. > > Rüdiger > > Am 04.05.2011 18:33, schrieb Christopher Brooks: > > On Wed, 04 May 2011 17:37:51 +0200 > > Ruediger Rolf<[email protected]> wrote: > > > >> Hi list, > >> > >> in our local 1.1 system we added a new workflow that creates videos > >> in different qualities for different internet bandwith: > >> http://video.virtuos.uni-osnabrueck.de:8080/engage/ui/watch.html?id=195 > >> Change the "Quality" setting in the lower right to see the different > >> qualities. > >> > >> We would like to too add this feature to the trunk too, but the > >> creation of the different qualities requires a more recent ffmpeg > >> version that supports the -vf (video filter) option. With -vf scale > >> it is possible use different resolutions for each quality and still > >> keep the correct aspect ratio. > >> > >> I added an additonal workflow definition that encodes the video in > >> different qualities. If we keep our ffmpeg version these videos might > >> get the wrong aspect ratio if they are not in 4:3 ratio. > >> > >> Any objections against an update of ffmpeg? > >> > >> Rüdiger > >> > > I like the idea of upgrading to a newer version, but it means a big qa > > effort..... > > > > Chris > > > > > -- > > ________________________________________________ > Rüdiger Rolf, M.A. > Universität Osnabrück - Zentrum virtUOS > Heger-Tor-Wall 12, 49069 Osnabrück > Telefon: (0541) 969-6511 - Fax: (0541) 969-16511 > E-Mail: [email protected] > Internet: www.virtuos.uni-osnabrueck.de > > _______________________________________________ > Matterhorn mailing list > [email protected] > http://lists.opencastproject.org/mailman/listinfo/matterhorn > > > To unsubscribe please email > [email protected] > _______________________________________________ >
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