Thank you so much Moritz Barsnick... You made my day... God bless you...That worked great for me...........
M S Rohit B.E, M.Tech, Assistant Professor, Dept of Computer Science & Engineering, Jain Institute of Technology, Davanagere. 9663861707 On Mon, Jan 5, 2015 at 3:54 PM, Moritz Barsnick [via FFmpeg-users] < [email protected]> wrote: > Hi Rohit, > > On Sun, Jan 04, 2015 at 23:46:26 -0800, Rohit wrote: > > ffmpeg -i delta.mpg -vf select="eq(pict_type\,PICT_TYPE_I)" -s 400x300 > -f image2 frame.mpg-%03d.tif > > You should always show us the complete, uncut output of your command. > > > which should extract all the I frames(as per -vf > > select="eq(pict_type\,PICT_TYPE_I)" ) in the input file. But I got 197 > > frames instead of 17 from this command and it looked like command has > just > > shown me all the frames. > > There's a Wiki entry covering this: > > https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video > > And though it doesn't explain why, it does hint that you need to use: > -vsync vfr > > This works for me. > > I believe the image2 muxer automatically assumes the same frame rate as > the input (i.e. automatically chooses "-vsync cfr"). Since you are > dropping all none-I-frames, it interpolates the missing frames to > produce the correct rate. BTW, I get less frames than the (my) source > video, because the muxers stops creating output at the last input > I-frame. > > Another BTW: The value PICT_TYPE_I, which is also used in the Wiki > entry, does not correspond to the documentation which says: > > > ‘pict_type (video only)’ > > > > The type of the filtered frame. It can assume one of the following > values: > > > > ‘I’ > > ‘P’ > > ‘B’ > > ‘S’ > > ‘SI’ > > ‘SP’ > > ‘BI’ > > But the source (libavfilter/f_select.c) tells me that the prefix > PICT_TYPE_ is also accepted. > > Moritz > _______________________________________________ > ffmpeg-user mailing list > [hidden email] <http:///user/SendEmail.jtp?type=node&node=4668752&i=0> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > http://ffmpeg-users.933282.n4.nabble.com/Extracting-I-P-B-frames-from-a-mpg-video-tp4668751p4668752.html > To unsubscribe from Extracting I P B frames from a mpg video, click here > <http://ffmpeg-users.933282.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4668751&code=cG93ZXJvaGl0QGdtYWlsLmNvbXw0NjY4NzUxfC02NzYyMDg1MTA=> > . > NAML > <http://ffmpeg-users.933282.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > -- View this message in context: http://ffmpeg-users.933282.n4.nabble.com/Extracting-I-P-B-frames-from-a-mpg-video-tp4668751p4668755.html Sent from the FFmpeg-users mailing list archive at Nabble.com. _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
