[mythtv-users] next step the player, any suggestions?

[Hika van den Hoven]

Hoi John,

Tuesday, October 25, 2022, 3:07:37 PM, you wrote:

> On 25/10/2022 12:58, Hika van den Hoven wrote:
>> Hoi Stephen,
>> 
>> Tuesday, October 25, 2022, 1:29:59 PM, you wrote:
>> 
>>> On Tue, 25 Oct 2022 12:58:39 +0200, you wrote:
>> 
>>>> Hoi Mike,
>>>>
>>>> Tuesday, October 25, 2022, 11:21:09 AM, you wrote:
>>>>
>>>>> On 25/10/2022 09:55, Stephen Worthington wrote:
>>>>>> On Tue, 25 Oct 2022 03:15:42 +0200, you wrote:
>>>>>>
>>>>>>> Hoi All,
>>>>>>>
>>>>>>> I now have hdhomerun_config working which outputs a ts stream with
>>>>>>> only audio. But I can not use mplayer as that again won't install
>>>>>>> without the graphical toolchain.
>>>>>>> As far as I have found the alsa tools won't work either, I have tried
>>>>>>> mpg321 and madplay, but either I haven't jet found the right options
>>>>>>> or they cannot handle ts. Any suggestions?
>>>>>>
>>>>>> Last time I tried VLC with our NZ DVB-T radio stations it worked. They
>>>>>> are .ts files with AAC audio in an MPEG2 transport stream container.
>>>>>> I have not tried the RPi version of VLC though.  But VLC will likely
>>>>>> need a lot of graphics stuff to install it.  Once installed, this
>>>>>> might do what you want:
>>>>>>
>>>>>> cvlc --no-video /path/to/.ts
>>>>>>
>>>>> I would add that a .ts stream is not an audio stream and therefore has to be decoded first.
>>>>
>>>>> Perhaps a simpler option would be to use ffmppeg to select out the audio which, by rights, should
>>>>> then be readable by the ALSA tools?
>>>>
>>>> Nice thought Mike! Do you perchance know the commands to use ffmpeg
>>>> like that? I will find them but it will save some time.
>>>>
>>>> I even came onto the mentioning of a ffmgeg-python module and
>>>> audio streams I have handled in python before in the analog radio
>>>> times. I already have build a python shell around  hdhomerun_config
>>>> for scanning and tuning. I'll share it when it is working.
>> 
>>> FFmpeg can be a pain if you want it to select out a stream for you.
>>> There are various things that you would think would work, but actually
>>> do not.  I tried using it to extract the MHEG5 EPG stream from our
>>> local DVB-T service, and it just could not do it.  It could create a
>>> transport stream with just that stream in it, but it could not provide
>>> just a copy of that single stream without the transport stream
>>> container.  A tool that will work for extracting a stream from a .ts
>>> file is TSDuck:
>> 
>>> https://tsduck.io
>> 
>>> Unfortunately, TSDuck is not normally available as packages and you
>>> have to build it from source.
>>> _______________________________________________
>> 
>> 
>> How about libav? On Gentoo it's the alternative to ffmpeg.

> I guess you want a streaming solution, not file-to-file, but maybe this
> line  from mythdvbradio.pl (wiki,2006) or my 'alternative version' of it
> might suggest something:

> {{{
> #
> # Now run ffmpeg to get mp3 out of the dvb radio recording
> #
> # $command = "ionice -c3 mythffmpeg -i $filename -ab $bitrate -ac 2 
> -acodec mp3 -f mp3 '$newfilename' 2>&1";

> # That mp2 to mp3 conversion runs at around 25x real speed with one cpu
> at 100%
> # Just relabelling mp2 as mp3 is much faster and seems to work, although
> it's probably not pukka
> # can be done by mplayer or by mapping in ffmpeg. "  -map 0:1 -c:a  copy
> " Bash extract below

> $command = "ionice -c3 mplayer -nogui -vo null -dumpaudio -dumpfile 
> '$newfilename' -nojoystick -nolirc '$filename' 2>&1 ";

> }}}

> HTH, John P

>> 
>> 
>> Tot mails,
>>    Hika                            mailto:hikavdh at gmail.com
>> 
Thanks John, am I right that ffmpeg only accepts input from a
file-like object? So I have to create a fifo file-object to accept the
output from the hdhomerun and use it as input.
Does this also go for the output or can I simply pipe it to aplay?
I probably first have to sample the stream to detect the format,
before forwarding it.


Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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