On 16/04/2018 5:21 PM, Steve Dodd wrote: > On Sun, Apr 15, 2018 at 9:59 PM, Nick Payne <njh...@gmail.com> wrote: > >> I experimented a while ago with running some GiP downloads through >> Handbrake to convert the video to the x265 codec. That reduced the file >> size to about 1/3 of the original download, with no subjective >> difference in video quality that I could see when viewing on our TV. > Figures - most of the comparison work done on H.265 v. H.264 says you > should get same subjective quality for half the bitrate. > >> A one hour 1280x720 25fps program that downloads as a 1Gb file was reduced >> in size to ~350Mb. On my PC, the re-encode runs at about 50fps for >> 1280x720, so ~2x real time for 25fps and ~real time for 50fps. For >> smaller video dimension such as 960x540, the re-encode speed was around >> 85-90FPS. > Do you know what x265 quality setting you used? I'm also experimenting > now it seems HLSHD is being turned off (series 2 of Salamander has HVF > only so far).. RF17 seems to be spitting about half the bitrate of the > BBC h.264 output, and running at ~40fps which I can live with (Core > i5-6500). Noticeable quality difference still when looking at stills, > but have tried watching it moving yet.. For re-encoding 1280x720 downloads to x265, on the Video tab in Handbrake I have the encoder preset at "Faster" and the RF quality at 23.
Nick _______________________________________________ get_iplayer mailing list firstname.lastname@example.org http://lists.infradead.org/mailman/listinfo/get_iplayer