On Thu Oct 1 19:37:36 BST 2015, Kenny Routledge wrote:
Is there a way of checking if the HLS downloads
have retried midstream, RTMP gives a retry response,
then I would start a fresh download
as otherwise there will be glitch in the file.
Hello Kenny
When GiP downloads TV through a hls tvmode,
ffmpeg is actually being used for the fetch (no
doubt you already know that); however, the console
output ffmpeg produces while downloading TV is
quite voluminous when compared to hls radiomodes
or the output produced by rtmpdump in flashmodes...
So it's not easy to inspect the Command Prompt
Window for stream interruptions post download...
One half-solution (if on windows) is to increase
the Command Prompt window's (used for GiP CLI)
"Screen Buffer Size -> Height" value to a big
number (search google on how to do that); I
have mine set to 900 (default is 300) - by doing
that you can use the vertical scroll line upwards
to "go back" quite a bit into the stream downloading
and look out for error messages...
But a nicer solution would be to redirect the
ffmpeg output from the CPW to a log file,
which you can inspect post download by
opening it up in a text editor (do not use notepad).
E.g., as a test I've issued the command:
get_iplayer --pid=b007v15w --tvmode=hlshigh --raw --force 2> D:\HLS.log
(you can specify your path of choice for the log...).
I've set --raw just for this test, so as to exclude
ffmpeg output from ts remuxing to mp4, thus
reducing log size.
If latency is introduced during download,
it will result in missed segments and ffmpeg will print warnings
accordingly - my connection is pretty robust
and I've not experienced (yet) completely broken hls
downloads, but I'm sure if that was the case
with you, you'd see it printed inside the log...
You can find my test log at:
http://pastebin.com/LN9eyfcr
As you can see, no incidents during download -
end .ts file is absolutely fine!
With HLS, I'm downloading, renaming the downloaded file
and then downloading a 2nd time.
If the two file sizes are identical
then I know the download is clean.
Isn't this an unjustified waste of bandwidth?
And in the event the two file sizes are not the same,
how can you tell if both files aren't truncated due to
missing HLS segments during download?
The "bigger" file may also be "incomplete",
just have fewer segments missing than its "smaller"
counterpart; would you then
attempt a third download?
And last time I checked, all the flashmodes
were still working from within the UK;
is there some other reason you've
changed already to the HLS modes?
Regards,
Vangelis.
_______________________________________________
get_iplayer mailing list
[email protected]
http://lists.infradead.org/mailman/listinfo/get_iplayer
