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

[John Pilkington]

On 25/10/2022 15:27, Hika van den Hoven wrote:
> 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.

Hi Hika:  You maybe right.  My 'new project' interactions with ffmpeg 
are usually on a 'what you get is not necessarily what you expect' 
basis. :-)

John
> 
> 
> Tot mails,
>    Hika                            mailto:hikavdh at gmail.com
> 
> "Zonder hoop kun je niet leven
> Zonder leven is er geen hoop
> Het eeuwige dilemma
> Zeker als je hoop moet vernietigen om te kunnen overleven!"
> 
> De lerende Mens
> 
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