[mythtv-users] IPTV recorder seems broken -- large jumpy files
Brian J. Murrell
brian at interlinx.bc.ca
Sun Mar 18 17:57:06 UTC 2018
On Sat, 2018-03-17 at 22:58 +0000, Mark Perkins wrote:
> On 18/03/18 08:41, Mark Perkins wrote:
> > Have you tried using ffmpeg -i or mediainfo or something equivalent
> > to
> > compare the file created by mythtv to the file created from ffmpeg?
I didn't. I ended up replacing the IPTV recorder with my own External
recorder based on "ffmpeg -i "$URL" -acodec copy -vcodec copy -f
> Just to put some additional words around this. I use the IPTV
> functionality for my recordings. I have a box with USB DVB-T tuners
> attached that runs mumudvb to rebroadcast the streams to multicast
> IP. I
> can then subscribe to those streams from as many mythbackends as I
> simultaneously from anywhere on my network. I picked a SD recording
> the news last night which was 588MiB for 27min which is fairly
> comparable to your 1GB per hour. So I don't think your large file
> are necessarily a problem with the IPTV recorder functionality but
> perhaps related to what is specifically being transmitted in the
No disagreement. ffmpeg seems to handle whatever is in the stream
better than mythtv though, which is what is interesting about it. The
URL I am recording from is:
I wouldn't be surprised if it's geoblocked outside of Canada though.
> If I had to guess, based on your sizes, perhaps the IPTV recorder
> recorded an entire multiplex not just a specific channel / stream?
I'm not sure it's that simple. I think it's more related to the
jumpiness. By jumpiness I mean that it will play a few minutes of the
recording and then seemingly go back to the beginning but this time
play a few more minutes than last time but then again, jump back to the
beginning and play yet a longer segment. I doubt there is any actual
jumping around in the stream and it's more like the stream is being
repeatedly written to the file from the beginning with each segment
writing a few more minutes than the last one.
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