On 10/24/2013 11:52 PM, Ronald S. Bultje wrote: > Hi, > > On Thu, Oct 24, 2013 at 5:29 PM, Peter B. <p...@das-werkstatt.com> wrote: > >> On 10/21/2013 12:43 AM, Luca Barbato wrote: >>> Basically you should make sample files (so 1 frame or 3 frame sample) >>> that sports specific corner cases or common cases. >>> >>> e.g. all the kind of capture you want to make using it. >> Like, e.g. VHS, DigiBeta, etc? >> If so, then how many different samples should I provide? >> The ones I have are usually in yuv422p. > > People typically use more standardized existing content, such as: > http://media.xiph.org/video/derf/
Hm... So, it seems that I didn't yet fully understand the purpose of the provided samples. I know the "Derf Collection" at Xiph.org very well, and I've ran mass-tests for FFV1 on them during FFV1.3 development [1]. Luca Barbato said to provide 1-3 frame samples of "all the kind of capture you want to make using it". Comparing the results from tests with the Derf Collection (and others, e.g. VQEG [2]) to our archive material, I've noticed that there are big differences, regarding the original source media of the video. The Derf collection, btw. also does not contain any material in 720x576 [3] - which is a common resolution for capturing PAL material. So, which samples would you like? I would also appreciate it, if you could point me somewhere to read up on what you are actually testing in this case, so I could understand the choice of samples myself :) Regards, Pb == References: [1] http://download.das-werkstatt.com/pb/mthk/ffv1_stats/latest/ [2] ftp://vqeg.its.bldrdoc.gov/ [3] http://download.das-werkstatt.com/pb/mthk/ffv1_stats/latest/ffv1_gopdiff-sd-yuv.html _______________________________________________ libav-devel mailing list libav-devel@libav.org https://lists.libav.org/mailman/listinfo/libav-devel
