Re: Using ffmpeg to halve frame rate

2018-04-18 Thread RS
On 17/04/18 22:27, Nick Payne wrote: I just ran another test on some 1280x720 50fps and 1280x720 25fps downloads from the last UK snooker championship. As before, the 25fps downloads were reduced to about 1/3 previous size by Handbrake (eg a 4h58m match that was 5.03Gb came down to 1.55Gb).

Re: Using ffmpeg to halve frame rate

2018-04-17 Thread Nick Payne
On 16/04/2018 6:59 AM, Nick Payne wrote: > On 16/04/2018 2:18 AM, RS wrote: >> A couple of years ago there were problems with HLS and there was >> speculation that we might have 50 fps HVFhd and DVFhd as the only HD >> modes.  At that time I wondered if it would be feasible to drop every >> other

Re: Using ffmpeg to halve frame rate

2018-04-16 Thread RS
On 16/04/18 09:27, Nick Payne wrote: On 16/04/2018 5:21 PM, Steve Dodd wrote: On Sun, Apr 15, 2018 at 9:59 PM, Nick Payne 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

Re: Using ffmpeg to halve frame rate

2018-04-16 Thread RS
On 15/04/18 17:47, Anthony Kehoe wrote: I actually worked on this on Friday. I do a lot of work with ffmpeg to get encodes working nicely with my 4K telly along with putting things in iTunes for the AppleTVs. I added a new option for my copy of get_iplayer, akfps, that changes the ffmpeg

Re: Using ffmpeg to halve frame rate

2018-04-16 Thread RS
On 16/04/18 08:21, Steve Dodd wrote: > > Incidentally, has anyone else noticed HE-AAC coming through in the > downloads recently? > Another advantage of HLShd was that there was no HE-AAC when the audio was 96kbit/s. HVF has used HE-AAC with 96kbit/s audio for some time, but only at the

Re: Using ffmpeg to halve frame rate

2018-04-16 Thread Nick Payne
On 16/04/2018 5:21 PM, Steve Dodd wrote: > On Sun, Apr 15, 2018 at 9:59 PM, Nick Payne 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

Re: Using ffmpeg to halve frame rate

2018-04-16 Thread Steve Dodd
On Sun, Apr 15, 2018 at 9:59 PM, Nick Payne 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

Re: Using ffmpeg to halve frame rate

2018-04-15 Thread Nick Payne
On 16/04/2018 2:18 AM, RS wrote: > A couple of years ago there were problems with HLS and there was > speculation that we might have 50 fps HVFhd and DVFhd as the only HD > modes.  At that time I wondered if it would be feasible to drop every > other frame to reduce the frame rte to 25 fps.  I

Re: Using ffmpeg to halve frame rate

2018-04-15 Thread Anthony Kehoe
I actually worked on this on Friday. I do a lot of work with ffmpeg to get encodes working nicely with my 4K telly along with putting things in iTunes for the AppleTVs. I added a new option for my copy of get_iplayer, akfps, that changes the ffmpeg resolutions should a 50fps version be

Using ffmpeg to halve frame rate

2018-04-15 Thread RS
A couple of years ago there were problems with HLS and there was speculation that we might have 50 fps HVFhd and DVFhd as the only HD modes. At that time I wondered if it would be feasible to drop every other frame to reduce the frame rte to 25 fps. I thought because of the H.264 delta