[mythtv-users] Audio source not available to ExternalRecorder in LiveTV

Thu Dec 6 18:19:04 UTC 2018

The only issue I've run into with ffmpeg is sometimes the V4l2 buffer is
not ready. I'm watching for that and relaunching ffmepg if that happens. My
ffmpeg command is:
2018-12-06 10:45:00,247 DEBUG - mythuc.py:194 - __init__() ffmpeg command:
ffmpeg -f v4l2 -video_size 1920x1200 -framerate 60.0 -input_format yuyv422
-thread_queue_size 2048 -i /dev/video0 -f alsa -thread_queue_size 2048 -i
hw:1,0 -map 0:v -map 1:a -f mpegts -acodec mp3 -loglevel error -pix_fmt
yuv420p -preset superfast -vcodec libx264 - -nostdin

Here is my logs when the v4l2 buffer isn't ready:
2018-12-06 10:45:00,259 DEBUG - mythuc.py:209 - start() Wating for ffmpeg
to warm up.
2018-12-06 10:45:00,600 DEBUG - mythuc.py:278 - loggy() Ffmpeg:
b'[video4linux2,v4l2 @ 0x556843eeaf00] Dequeued v4l2 buffer contains
1579180 bytes, but 4608000 were expected. Flags: 0x00012001.\n'
2018-12-06 10:45:00,600 WARNING - mythuc.py:280 - loggy() Ffmpeg not
getting v4l2 stream. Going to restart ffmpeg...
2018-12-06 10:45:00,601 DEBUG - mythuc.py:212 - start() ffmpeg warmed up
with state: ERROR
2018-12-06 10:45:00,601 DEBUG - mythuc.py:215 - start() Ffmpeg in error
state. Restart (1)
2018-12-06 10:45:00,602 DEBUG - mythuc.py:217 - start() ffmpeg sent
terminate
2018-12-06 10:45:01,352 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 54400 to 48692
2018-12-06 10:45:01,368 DEBUG - mythuc.py:219 - start() Restarting
FFmpeg...
2018-12-06 10:45:01,372 DEBUG - mythuc.py:271 - loggy() Loggy thread
running...
2018-12-06 10:45:01,373 DEBUG - mythuc.py:209 - start() Wating for ffmpeg
to warm up.
2018-12-06 10:45:01,674 DEBUG - mythuc.py:278 - loggy() Ffmpeg: b'[alsa @
0x5625c200b500] cannot open audio device hw:1,0 (Device or resource
busy)\n'
2018-12-06 10:45:01,674 DEBUG - mythuc.py:278 - loggy() Ffmpeg: b'hw:1,0:
Input/output error\n'
2018-12-06 10:45:02,108 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 48692 to 52640
2018-12-06 10:45:02,308 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 52640 to 57904
2018-12-06 10:45:02,373 DEBUG - mythuc.py:212 - start() ffmpeg warmed up
with state: INIT
2018-12-06 10:45:02,374 DEBUG - mythuc.py:99 - ms_run() MythtvSend main
thread starting...
2018-12-06 10:45:02,374 DEBUG - mythuc.py:415 - cmd_resp() Command reply:
OK:Started
2018-12-06 10:45:02,375 INFO - mythuc.py:439 - get_cmd() Received command:
'XON'
2018-12-06 10:45:02,376 DEBUG - mythuc.py:415 - cmd_resp() Command reply:
OK
2018-12-06 10:45:02,509 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 57904 to 63168
2018-12-06 10:45:02,709 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 63168 to 126336
2018-12-06 10:45:02,910 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 126336 to 252672
2018-12-06 10:45:03,110 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 252672 to 505344
2018-12-06 10:45:03,311 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 505344 to 1010688
2018-12-06 10:45:03,511 INFO - mythuc.py:304 - adjust_chunksize() Stream
read block size changed from 1010688 to 1048576
2018-12-06 10:50:00,320 INFO - mythuc.py:439 - get_cmd() Received command:
'CloseRecorder'
2018-12-06 10:50:00,320 INFO - mythuc.py:243 - close() Shutting down ffmpeg
2018-12-06 10:50:00,321 INFO - mythuc.py:252 - close() Ffmpeg shut down
successfully.
2018-12-06 10:50:00,321 INFO - mythuc.py:84 - close() Shutting down the
MythTV sender.
2018-12-06 10:50:00,321 INFO - mythuc.py:96 - close() MythTV sender queue
drained.
2018-12-06 10:50:00,321 DEBUG - mythuc.py:415 - cmd_resp() Command reply:
OK:Terminating

----------------
Robert LeBlanc
PGP Fingerprint 79A2 9CA4 6CC4 45DD A904  C70E E654 3BB2 FA62 B9F1

On Thu, Dec 6, 2018 at 10:55 AM John P Poet <jppoet at gmail.com> wrote:

> On Thu, Dec 6, 2018 at 10:48 AM Robert LeBlanc <robert at leblancnet.us>
> wrote:
>
>> I've got just about everything set up to capture from my USB capture
>> device. When my script is run from Mythbackend, the hw:1 device is not
>> available to my recorder script when watching LiveTV (frontend on the same
>> box). When I run the script stand alone with Mythbackend and Mythfrontend
>> running but not watching LiveTV get both video and audio. I tried setting
>> the Mythfrontend to use the null sound device and it still holds on to
>> hw:1. I tried both hw:1 and hw:1,0 with the same results.
>>
>> The backend segfaults probably because of a corrupted stream from ffmpeg
>> because of this. If I don't try to capture the audio, then I can see the
>> LiveTV stream just fine of course there is no audio.
>>
>>  Any ideas how to get around this problem?
>>
>> Here is some logs from my ExternalRecorder script.
>>
>> 2018-12-06 10:25:20,226 DEBUG - mythuc.py:209 - start() Wating for ffmpeg
>> to warm up.
>> 2018-12-06 10:25:20,506 DEBUG - mythuc.py:278 - loggy() Ffmpeg: b'[alsa @
>> 0x55838b4c2500] cannot open audio device hw:1,0 (Device or resource
>> busy)\n'
>> 2018-12-06 10:25:20,506 DEBUG - mythuc.py:278 - loggy() Ffmpeg: b'hw:1,0:
>> Input/output error\n'
>> 2018-12-06 10:25:20,728 INFO - mythuc.py:304 - adjust_chunksize() Stream
>> read block size changed from 48692 to 52640
>> 2018-12-06 10:25:20,929 INFO - mythuc.py:304 - adjust_chunksize() Stream
>> read block size changed from 52640 to 57904
>>
>> Scheduling a recording and not running Mythfrontend also has the same
>> error opening the audio device, so it must be something with the backend.
>> There is only the one Capture device (ExternalRecorder) configured so I'm
>> not sure why Mythbackend is even messing with that device. I'm running 29.1
>> from deb-multimedia(mythbackend version:  [v29.1] www.mythtv.org)
>>
>
> Can you post the complete ffmpeg command with arguments that you are
> using?   At least when I was playing around with mythexternrecorder
> configurations (https://www.mythtv.org/wiki/ExternalRecorder and
> https://www.mythtv.org/wiki/Example_Configuration_files) I found that
> using cvlc was much more reliable than ffmpeg, so you may want to try that.
>
> John
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