Problems downloading Winter Olympics

fred.d fred.d at timelords.org.uk
Sun Mar 6 13:13:35 PST 2022


Re. file sizes doubling.

In my expereince some are and many aren't. I can't quite get a handle on 
why. I too have seen 1.5 hour films go to 5.5GB where before I would 
expect 2.5 - 3. Yet one episode of Killing Eve from the last series 
yields the info below for the full HD and the 1280x720 versions.

Hardly an increase in file size, but then the compression is different 
and may or may not suit the type of scenes within the episode I guess. 
Compression is a bit of a mystery to me...

I've always been impressed by the quality of the 1280 x 720 on our 4K 
UHD screen and while the quality is subjectively better in certain areas 
with the Full HD, it's not something I'd do every time if it was 
doubling the storage requirement.

To be honest I find that better sound has more impact on the 
"watchability"/enjoyment of a lot of programs than the video. We stream 
a lot these days from Netflix/Disney+/Prime... which is going to be a 
lot more compressed than the video in these files but the Atmos or DTS 
audio through the surround speakers and sub. on the streamed content 
make such an impact, which (even with all the processing the audio 
system can throw at it) the iplayer files never match.

If anyone's wondering from the info, I store most things in .TS unless 
I'm ripping my DVD's/BluRays mainly because that's what all the off air 
recordings from whenever were recorded in. Must admit I'm no longer sure 
if this is the best way to do this with iplayer files but hey.

Rgds.


----------------------------------

General
ID                                       : 1 (0x1)
Complete name                            : V:\TV\Drama E-K\Killing 
Eve\Killing Eve S03E08 Are You Leading or Am I.ts
Format                                   : MPEG-TS
File size                                : 1.38 GiB
Duration                                 : 42 min 29 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 4 650 kb/s

Video
ID                                       : 257 (0x101)
Menu ID                                  : 1 (0x1)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High at L4.2
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : 27
Duration                                 : 42 min 31 s
Bit rate mode                            : Variable
Maximum bit rate                         : 12.0 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 50.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 256 (0x100)
Menu ID                                  : 1 (0x1)
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low 
Complexity
Format version                           : Version 4
Muxing mode                              : ADTS
Codec ID                                 : 15-2
Duration                                 : 42 min 31 s
Bit rate mode                            : Variable
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Language                                 : English

Menu
ID                                       : 4096 (0x1000)
Menu ID                                  : 1 (0x1)
Duration                                 : 42 min 29 s
List                                     : 256 (0x100) (AAC, English) / 
257 (0x101) (AVC)
Language                                 : English
Service name                             : Service01
Service provider                         : FFmpeg
Service type                             : digital television


General
ID                                       : 16727 (0x4157)
Complete name                            : V:\Alternates\Killing 
Eve\Killing Eve S03E08 Are You Leading or Am I.ts
Format                                   : MPEG-TS
File size                                : 1.29 GiB
Duration                                 : 42 min 31 s
Overall bit rate mode                    : Variable
Overall bit rate                         : 4 358 kb/s

Video
ID                                       : 33 (0x21)
Menu ID                                  : 16727 (0x4157)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High at L3.2
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : 27
Duration                                 : 42 min 31 s
Maximum bit rate                         : 5 070 kb/s
Width                                    : 1 280 pixels
Height                                   : 720 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 50.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709

Audio
ID                                       : 34 (0x22)
Menu ID                                  : 16727 (0x4157)
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low 
Complexity
Format version                           : Version 4
Muxing mode                              : ADTS
Codec ID                                 : 15-2
Duration                                 : 42 min 31 s
Bit rate mode                            : Variable
Maximum bit rate                         : 128 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Delay relative to video                  : -20 ms
Language                                 : English


On 06/03/2022 18:45, MacFH - C E Macfarlane - News wrote:
> On 06/03/2022 18:07, Paul Phillips wrote:
>>
>> The change in video quality available is described on this page for
>> version 3.29.
>>
>> https://github.com/get-iplayer/get_iplayer/wiki/release320to329#release329 
>>
>>
>> I've seen a doubling in file sizes to approx 4GB per hour when
>> selecting fhd video quality
>
> Both my simple mathematical calculation and the above linked page 
> suggests that they shouldn't be more than about 1.5 to 1.6 times the 
> size of an HD download.
>
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> get_iplayer at lists.infradead.org
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