GiP-2.95-develop & list archives

[Paul Phillips]

Thanks for this info.

Disk space aside, and frame rate aside, is the picture quality better
if you use "best" with 2.95?  (I would be plugging this into WebPVR
and using quick URL)

On 7 April 2016 at 19:41, Vangelis forthnet <northmedia1 at the.forthnet.gr> wrote:
> On Thu Apr 7 12:09:34 BST 2016, artisticforge . wrote:
>
>> I spent part of yesterday reading the list archives
>> and have a better understanding now
>> as to why GiP-2.95-dev is so slow.
>> (snip)
>> interesting reading the archives.
>
>
> Hello terry :-)
> (I do hope the pain relievers are still doing their job fine...)
>
> 2.95-dev is indeed unsupported and undocumented,
> plus it is under constant change - the best source to
> read if you have time and want to get a clue as to how
> things work in 2.95dev is to trace the individual commit
> logs in the Github repo - start from
> https://github.com/get-iplayer/get_iplayer/commit/8946c25446f38dea4baf9b4db813c8354e05a73e
> in page 4 of main script commit history
> https://github.com/get-iplayer/get_iplayer/commits/develop/get_iplayer?page=4
> opening each commit in a separate tab
> and reading the commit log (where available)
> and work your way up to latest commit
> https://github.com/get-iplayer/get_iplayer/commit/53e9c7f6f8635b1907609291ca20bbdd49e17978
> in page 1:
> https://github.com/get-iplayer/get_iplayer/commits/develop/get_iplayer
>
> Then you'll get a good grasp of the features
> removed/added during the development process...
>
>> Part of that slowness is from perl
>> doing a main part of the work.
>
>
> 2.95dev implements by default a native - pure perl -
> HLS/DASH streamer; container change
> (lossless remux) and transcoding, when specified,
> is still being realised by FFmpeg.
>
> HLS modes for video and (re-introduced) DASH
> modes for audio are now the default in latest snapshot.
> FWIW, I do not find the native downloader to be
> that much slower to FFmpeg...
> FFmpeg itself cannot handle DASH downloads,
> but if you'd like to re-assign FFmpeg to manage
> HLS downloads (current - and only - behaviour
> in GiP 2.94), you can do so via the --hls-ffmpeg switch.
>
>> Nearly all downloads are hls
>> with two to four times the bit rate.
>
>
> You can get a glimpse of available modes/modesizes
> for a specific pid via the --info (-i) switch.
>
> perl get_iplayer-295dev-g53e9c7f6.pl --pid=b073rfc0 -i
> =>
> ===================================================
> modes:          original:
> flashhd1,flashvhigh1,flashvhigh2,flashhigh1,flashhigh2
> ,flashstd1,flashstd2,flashlow1,flashlow2,hlshd1,hlsvhigh1,hlshigh1,hlslow1,hlslo
> w2,hvfhd1,hvfhd2,hvfsd1,hvfsd2,hvfvhigh1,hvfvhigh2,hvfhigh1,hvfhigh2,hvfstd1,hvf
> std2,hvflow1,hvflow2,subtitles1
>
> modesizes:      original:
> flashhd1=499MB,flashvhigh1=314MB,flashvhigh2=314MB,fla
> shhigh1=168MB,flashhigh2=168MB,flashstd1=107MB,flashstd2=107MB,flashlow1=84MB,fl
> ashlow2=84MB,hlshd1=510MB,hlsvhigh1=321MB,hlshigh1=171MB,hlslow1=109MB,hlslow2=1
> 09MB,hvfhd1=1182MB,hvfhd2=1182MB,hvfsd1=669MB,hvfsd2=669MB,hvfvhigh1=386MB,hvfvh
> igh2=386MB,hvfhigh1=210MB,hvfhigh2=210MB,hvfstd1=121MB,hvfstd2=121MB,hvflow1=86M
> B,hvflow2=86MB,subtitles1=60KB
> ===================================================
>
> The flash* and hls* tvmodes are exactly the same
> as you know them from GiP 2.94. If you'd like to
> download one of those, indicate so via the --modes
> (or --tvmode) switch.
> The hvf* tvmodes are new to 2.95dev, they are the
> "Video Factory" ones.
> - hvfvhigh is comparable to hlsvhigh, but slightly better
> both in resolution (540p) and BR (ca. 1700kbps).
> - hvfsd is again 540p, but the doubled size is due to
> 50FPS, not to a mere increase of BR in the 25FPS file.
> - hvfhd is 720p (same resolution as flashhd/hlshd),
> but again the huge filesize is due to 50FPS.
>
> I am not following this currently, as I have
> no interest in the 50FPS files, however it was
> posted previously in the Support Forum
> that the vast plethora of TV content on iplayer
> is not 50FPS originally, so for most 50FPS files
> there is a simple dublication of 25FPS=>50FPS,
> IOW in a minute's worth of video stream, there
> exist only 25 unique different frames.
> One notable exception to the above are sports
> events (and possibly other genres where quick
> motion is involved...).
>
> Due to the excessive toll on bandwidth and
> disk space storage, plus some issues pertaining to
> 1) older FFmpeg versions (<2.5), which do not
> work with hvf streams,
> 2) the absence of AD versions in hvf format,
> hls tvmodes are still the default for VOD.
>
> Just some useful info for those trialing the dev version...
>
> To you, terry, and all the rest,
> take care!
>
> Vangelis
>
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-- 
Paul Phillips