3.05 separate downloads for video+audio and audio

[Alan Milewczyk]

On 19/10/2017 04:18, Nick Payne wrote:
> I recently upgraded from 3.02 to 3.05. I notice that with the new
> version, when I download a TV programme GiP performs two separate
> downloads. The first is shown in the terminal output as being
> [audio+video], the second much smaller download as just being [audio].
> Why the two separate downloads? If I play the first [audio+video]
> download (this file has an hls.ts extension) while the separate [audio]
> download has not yet completed, the audio is already there in the file,
> so why the second download?
>
> This is what I see on the console:
>
> ====================================================================
> INFO: Downloading tv: 'Kaufmann's Otello at the Royal Opera House - -
> (b099tpcb) [original]'
> INFO: Downloaded: 2685.38 MiB (02:30:10) @ 7.92 Mibit/s (hlshd1)
> [audio+video]
> INFO: Downloaded: 363.78 MiB (02:30:10) @ 7.35 Mibit/s (hvfhd1) [audio]
> INFO: Converting to MP4
> INFO: Tagging MP4
> ====================================================================
>
> Nick
>

There's been a certain amount of user comment about the fact that high 
quality video downloads are let down by relatively poor audio at only 
96k which is the default. In previous versions the only way to get 128k 
or 320k audio was to have video at 50fps rather than the usual 25fps - 
this had the effect of bloating downloads to 2GB for a one hour download 
which was complained about as being excessive.

So the new version does two downloads (where higher quality audio at 
128k or 320k is available, which is not the case for all programmes) - 
the first does a standard video download (1GB per one hour of video) and 
then another one, of just the audio where it's available at 128k/320k. 
Then the files are combined, which does rather lengthen the time taken 
for the whole process. It's taking around twice the time to fully 
download and convert but I do like the improved audio despite the hit on 
processing time.

This is covered in the release notes 
https://github.com/get-iplayer/get_iplayer/wiki/release300to309#release303. 
If you don't want this new option, then you should specify --no-hq-audio.

HTH


Alan


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