On Fri, Sep 25, 2015 at 2:46 PM, Ståle Kristoffersen <staal...@ifi.uio.no> wrote: > On 2015-09-01 at 16:27, Rainer Hochecker wrote: >> >> fix splitting extradata from ts > > Hi, > this commit introduces a regression for me. > I'm trying to extract a thumb from the middle of a live TS, containing one > HEVC-stream. > Unfortunately I'm not sure if I can provide a sample, but before this patch > I would always get a good looking thumb, but with this patch I would for > the most part get a mostly gray frame. > > If I generates a few more thumbnails i see that it eventually spits out the > same frame that ffmpeg before this patch produced as the first thumb, and > it looks OK. > > However it is much more blocky than what the previous ffmpeg produced: > This is the command I want to run: > > ffmpeg -nostdin -y -an -i hevc_fail.ts -vframes 1 -vf scale=iw*sar:ih > thumb%d.jpg -v 100 > > > Before this patch: > http://kolbu.ws/~chiller/thumb1.jpg > > with this patch: > http://kolbu.ws/~chiller/thumb1.62bd8deef9005dbc9750e3bdc12fbf9b50392adc.jpg > > If i let it generates a few more thumbs I end up with a "good" thumb: > http://kolbu.ws/~chiller/thumb18.62bd8deef9005dbc9750e3bdc12fbf9b50392adc.jpg > > However, if you compare the two you will see that even the good thumb with > this patch is much more blocky.
It seems unlikely that this patch is the cause of that, but regardless - please open an issue on Trac, preferably with a small sample and command line to test the difference. - Hendrik _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
