[mythtv-users] IPTV recorder seems broken -- large jumpy files

Rajil Saraswat rajil.s at gmail.com
Fri Apr 6 13:54:58 UTC 2018


On 04/06/2018 08:35 AM, Dan Wilga wrote:
> On 4/6/18 8:56 AM, Rajil Saraswat wrote:
>> On 04/06/2018 06:52 AM, Greg Thompson wrote:
>>> Why are your fps jumping around so much? It looks like maybe your
>>> ffmpeg command line needs tweaked.
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>> It seems to work fine if I run it independently in cli. Also, I have
>> noticed that if i use the IPTV recorder in mythtv the stream works fine.
>> It is only when using External recorder with ffmpeg when things break
>> down. Could this be related how fast Mythtv wants to read from ffmpeg
>> and how quickly can ffmpeg deliver?
> In my attempts to get the Blackmagic DeckLink to record with Myth, I
> ran into similar problems. It wasn't until I modified mythfilerecorder
> to allow for the stdout of a program (like ffmpeg) to be sent
> unbuffered to the backend that things started to work. You can see my
> patch here, if you want to try it:
>
> https://code.mythtv.org/trac/ticket/13251

Does your patch improve the External Recorder or do i need to setup a
new tuner type?

At the moment i simply use ffmpeg like so with External Recorder,

ffmpeg -i "udp://@239.255.42.42:5004" -acodec copy -vcodec copy -f
mpegts - &



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