On Tue Jul 19 17:44:02 BST 2016, Anthony Kehoe wrote:
I have tested with v2.94 and the old mode still works,
however it's not exposed with the new version.
Hi Anthony!
Are you absolutely certain?
The beeb have killed the old 720p25fps Live TV feeds
(--livetvmode=hlshd) many months ago, for the record
those were 1280x720p/25fps/VideoBR ~ 3500kbps
(AVC profile High at L3.2)/AudioBR ~ 128kbps
(AAC LC), so their specs were different to the
--tvmode=hlshd in use still now for VOD
[1280x720p/25fps/VideoBR ~ 2300kbps
(AVC profile High at L4.1)/AudioBR ~ 96kbps
(AAC LC)].
If in fact they do still exist somewhere, please provide
sound proof of that! GiP surely doesn't know where
to search for/find them!
Last September (2015), issue #202 was created,
https://github.com/get-iplayer/get_iplayer/issues/202
and later closed on 05/10/2015 by commit git-6f81133
https://github.com/get-iplayer/get_iplayer/commit/6f81133
which dealt (among others) with the demise of the former
HD (720p) live TV streams:
- Removed old method of finding HLS live TV streams
from HDS data. Live TV streams now derived
from Video Factory data
720p25fps live TV AdobeHDS streams were killed-off
by the beeb, so GiP couldn't generate the AppleHLS
equivalents of them...
I have a custom Windows GiP installation so I can check
various different versions of the main get_iplayer perl script;
to test further your claim, with the vanilla "tag 2.94" script
I issued:
perl get_iplayer-294.pl --type=livetv "BBC One" -i -v
which found:
INFO: Found mode hlshigh1: (gip_hls_simulcast_978) hls h264 704x396 978kbps
stre
am (CDN: ll_hls_live/102)
INFO: Found mode hlshigh2: (gip_hls_simulcast_978) hls h264 704x396 978kbps
stre
am (CDN: akamai_hls_live/101)
INFO: Found mode hlslow1: (gip_hls_simulcast_348) hls h264 384x216 348kbps
strea
m (CDN: ll_hls_live/102)
INFO: Found mode hlslow2: (gip_hls_simulcast_348) hls h264 384x216 348kbps
strea
m (CDN: akamai_hls_live/101)
INFO: Found mode hlsstd1: (gip_hls_simulcast_564) hls h264 512x288 564kbps
strea
m (CDN: ll_hls_live/102)
INFO: Found mode hlsstd2: (gip_hls_simulcast_564) hls h264 512x288 564kbps
strea
m (CDN: akamai_hls_live/101)
INFO: Found mode hlsvhigh1: (gip_hls_simulcast_1802) hls h264 960x540
1802kbps s
tream (CDN: ll_hls_live/102)
INFO: Found mode hlsvhigh2: (gip_hls_simulcast_1802) hls h264 960x540
1802kbps s
tream (CDN: akamai_hls_live/101)
INFO: Will search for versions: default
As you (or anyone) can see, no trace of a hlshd (1280x720p 3600kbps)
livetvmode! The highest quality GiP 2.94 can currently find is
hlsvhigh (960x540 1802kbps, 25fps) - a test 1min recording confirmed it:
perl get_iplayer-294.pl --type=livetv "BBC
One" -g --livetvmode=best --hls-livetv-opts="-c copy" --force --stop 60
(my ffmpeg version is > 2.5, so I used
--hls-livetv-opts="-c copy" to avoid an
unnecessary, in my case, audio-video
recoding, the default setting in GiP 2.94)
The "hlsvhigh" livetvmode of GiP 2.94
has been re-labeled to "hvfvhigh" in GiP 2.95,
after the segregation of the "Video Factory" HLS modes...
With the vanilla 2.95 script:
perl get_iplayer-295.pl --type=livetv "BBC One" -i -v
INFO: Found mode hvfhd1: (gip_hvf_simulcast_5380) hls h264 1280x720 5380kbps
str
eam (CDN: ll_hls_live/102)
INFO: Found mode hvfhd2: (gip_hvf_simulcast_5380) hls h264 1280x720 5380kbps
str
eam (CDN: akamai_hls_live/101)
(snip)
INFO: Found mode hvfsd1: (gip_hvf_simulcast_3043) hls h264 960x540 3043kbps
stre
am (CDN: ll_hls_live/102)
INFO: Found mode hvfsd2: (gip_hvf_simulcast_3043) hls h264 960x540 3043kbps
stre
am (CDN: akamai_hls_live/101)
(snip)
INFO: Found mode hvfvhigh1: (gip_hvf_simulcast_1759) hls h264 960x540
1759kbps s
tream (CDN: ll_hls_live/102)
INFO: Found mode hvfvhigh2: (gip_hvf_simulcast_1759) hls h264 960x540
1759kbps s
tream (CDN: akamai_hls_live/101)
but the default LiveTV mode is now hvfhd for HD streams
(snip)
hvfhd downloads at twice the bandwidth (50fps stream)
compared to the old mode, however there
is negligible quality improvement in general.
As I've said in the beginning of this reply,
the actual increase in bandwidth for the 720p
live stream is not 100%, but a ~ 50%
one [(5380-3630)*100/3630].
What you describe is true only for on-demand
(file size of hvfhd roughly twice of hlshd=flashhd).
If, as you say, you feel uncomfortable
with the high bitrate of hvfhd livetvmode
for - admittedly - small quality gains, you can stay
away from it by specifically asking in your
commands for --livetvmode=hvfsd
(960x540p/3043kbps/50fps) or
--livetvmode=hvfvhigh
(960x540p/1760kbps/25fps).
Better yet, wait until the TV content you are consuming
via the live TV stream has made it to on-demand,
then record the hlshd tvmode...
Would it be possible to add
hls modes back in for LiveTV
Please provide direct instructions as to
how those elusive hlshd (720p25fps)
live TV streams can be located; in the
event your initial claim about their existence
stands true, I wouldn't hold my breath!
In 2.95, the code maintainer has
"deprecated" live stream (TV|radio)
recording functions of GiP - they do still
work at the extent they did at 2.95's release,
however he's not inclined to further continue
support for them; most probably they'll
be ripped out from GiP in the next major release!
(... a search on your website reveals you are
an IT professional, so I guess you'll feel
at ease with the somewhat "techie" nature
of my response...)
Most kind regards,
Vangelis.
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