does this plugin support Kindle e-readers? (not working on kindle basic 2022)

[thisf272-lang]

i paired my bluetooth headphones using the kindle's native top-swipe menu.

...
03/24/26-20:27:56 WARN Audiobook: Found word ' wailing ' via screen-pos at 3 (approx_offset= 9 screen_y= 36 dist= 6 )
03/24/26-20:27:56 WARN SyncController: start() — screen 1072 x 1448 mode= portrait rotation= 0
03/24/26-20:27:56 WARN SyncController: readNextSentence idx= 1 / 13 state= loading
03/24/26-20:27:56 WARN SyncController: Synthesizing sentence 1 ( A wailing at the back door demands my at )
03/24/26-20:27:57 WARN SyncController: beginSentencePlayback sentence 1 has_audio= true
03/24/26-20:27:57 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774394876_1.wav is_speaking= false
03/24/26-20:27:57 ERROR TTSEngine: No audio player found
03/24/26-20:27:57 WARN SyncController: Completion callback, concat ending at sentence 1 state= playing
03/24/26-20:27:57 WARN SyncController: Scheduling next sentence in 0.1 s
03/24/26-20:27:57 WARN SyncController: play() failed, stopping read-along
03/24/26-20:27:58 WARN SyncController: Chain BLOCKED — state is STOPPED when timer fired
03/24/26-20:28:17 WARN Audiobook: Found word ' wailing ' via screen-pos at 3 (approx_offset= 9 screen_y= 36 dist= 6 )
03/24/26-20:28:17 WARN SyncController: start() — screen 1072 x 1448 mode= portrait rotation= 0
03/24/26-20:28:17 WARN SyncController: readNextSentence idx= 1 / 13 state= loading
03/24/26-20:28:17 WARN SyncController: Synthesizing sentence 1 ( A wailing at the back door demands my at )
03/24/26-20:28:17 WARN SyncController: beginSentencePlayback sentence 1 has_audio= true
03/24/26-20:28:17 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774394897_2.wav is_speaking= false
03/24/26-20:28:17 ERROR TTSEngine: No audio player found
03/24/26-20:28:17 WARN SyncController: Completion callback, concat ending at sentence 1 state= playing
03/24/26-20:28:17 WARN SyncController: Scheduling next sentence in 0.1 s
03/24/26-20:28:17 WARN SyncController: play() failed, stopping read-along
03/24/26-20:28:18 WARN SyncController: Chain BLOCKED — state is STOPPED when timer fired
03/24/26-20:32:36 WARN PiperQueue: Servers stopped, rescued 0 pending entries
03/24/26-20:32:37 WARN PiperQueue: Servers stopped, rescued 0 pending entries
03/24/26-20:32:37 INFO UIManager: No dialogs left to show
03/24/26-20:32:37 INFO Tearing down UIManager with exit code: 0
[ko-input] Closed input device with fd: 10 @ idx: 1 (matched by idx)
[ko-input] Closed input device with fd: 9 @ idx: 0 (matched by idx)
lipc-wait-event exited normally with status: 0

[stradichenko]

Thank you for sharing.
The findAudioPlayer() function was skipping aplay on Kindle because reports "no soundcards" - even when BT headphones are paired through the OS.

I'd:

1. Pair BT headphones via the Kindle top-swipe menu before starting playback
2. Update to the next release (which includes this fix) v.0.1.5 ant lion (coming in the following hour).
3. If it still fails, the bug report will now log has_soundcard and is_kindle status which will help diagnose further

In 2h give me a thumbs up to know if the issue was solved.
Cheers.

[thisf272-lang]

sure, i'll let you know.

btw, i asked gemini about it and it said this is likely an OS limitation. Apparently, Amazon completely locks down the Kindle's audio/Bluetooth API, so third-party apps (like KOReader) just don't have permission to use it?

Thought I'd pass that along so if the AI is right, you don't end up chasing a dead end

[thisf272-lang]

this is on 0.1.5, no sound is coming through on the earbuds

03/24/26-23:03:24 WARN  Audiobook: Found word ' like ' via screen-pos at 3 (approx_offset= 6 screen_y= 36 dist= 3 ) 
03/24/26-23:03:24 WARN  SyncController: start() — screen 1072 x 1448 mode= portrait rotation= 0 
03/24/26-23:03:24 WARN  SyncController: readNextSentence idx= 1 / 12 state= loading 
03/24/26-23:03:24 WARN  SyncController: Synthesizing sentence 1 ( I like Hazelle. ) 
03/24/26-23:03:24 WARN  SyncController: beginSentencePlayback sentence 1 has_audio= true 
03/24/26-23:03:24 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404204_21.wav is_speaking= false 
03/24/26-23:03:24 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:24 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:24 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24416 
03/24/26-23:03:25 WARN  SyncController: Highlighting sentence 1 (scheduled+358ms) 
03/24/26-23:03:25 WARN  TTSEngine: Process watcher → normal completion, elapsed= 685 ms 
03/24/26-23:03:25 WARN  TTSEngine: onPlaybackComplete gen= 40 pid= 24416 
03/24/26-23:03:25 WARN  SyncController: Completion callback, concat ending at sentence 1 state= playing 
03/24/26-23:03:25 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:25 WARN  SyncController: readNextSentence idx= 2 / 12 state= playing 
03/24/26-23:03:25 WARN  SyncController: Using prefetched audio for sentence 2 
03/24/26-23:03:25 WARN  SyncController: beginSentencePlayback sentence 2 has_audio= true 
03/24/26-23:03:25 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404205_22.wav is_speaking= false 
03/24/26-23:03:25 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:25 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:25 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24422 
03/24/26-23:03:26 WARN  SyncController: Highlighting sentence 2 (scheduled+339ms) 
03/24/26-23:03:26 WARN  TTSEngine: Process watcher → normal completion, elapsed= 339 ms 
03/24/26-23:03:26 WARN  TTSEngine: onPlaybackComplete gen= 42 pid= 24422 
03/24/26-23:03:26 WARN  SyncController: Completion callback, concat ending at sentence 2 state= playing 
03/24/26-23:03:26 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:26 WARN  SyncController: readNextSentence idx= 3 / 12 state= playing 
03/24/26-23:03:26 WARN  SyncController: Using prefetched audio for sentence 3 
03/24/26-23:03:26 WARN  SyncController: beginSentencePlayback sentence 3 has_audio= true 
03/24/26-23:03:26 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404205_23.wav is_speaking= false 
03/24/26-23:03:26 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:26 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:26 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24428 
03/24/26-23:03:26 WARN  SyncController: Highlighting sentence 3 (scheduled+82ms) 
03/24/26-23:03:26 WARN  TTSEngine: Process watcher → normal completion, elapsed= 454 ms 
03/24/26-23:03:26 WARN  TTSEngine: onPlaybackComplete gen= 44 pid= 24428 
03/24/26-23:03:26 WARN  SyncController: Completion callback, concat ending at sentence 3 state= playing 
03/24/26-23:03:26 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:26 WARN  SyncController: readNextSentence idx= 4 / 12 state= playing 
03/24/26-23:03:26 WARN  SyncController: Using prefetched audio for sentence 4 
03/24/26-23:03:26 WARN  SyncController: beginSentencePlayback sentence 4 has_audio= true 
03/24/26-23:03:26 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404206_24.wav is_speaking= false 
03/24/26-23:03:26 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:26 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:26 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24434 
03/24/26-23:03:27 WARN  SyncController: Highlighting sentence 4 (scheduled+349ms) 
03/24/26-23:03:27 WARN  TTSEngine: Process watcher → normal completion, elapsed= 349 ms 
03/24/26-23:03:27 WARN  TTSEngine: onPlaybackComplete gen= 46 pid= 24434 
03/24/26-23:03:27 WARN  SyncController: Completion callback, concat ending at sentence 4 state= playing 
03/24/26-23:03:27 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:27 WARN  SyncController: readNextSentence idx= 5 / 12 state= playing 
03/24/26-23:03:27 WARN  SyncController: Using prefetched audio for sentence 5 
03/24/26-23:03:27 WARN  SyncController: beginSentencePlayback sentence 5 has_audio= true 
03/24/26-23:03:27 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404207_25.wav is_speaking= false 
03/24/26-23:03:27 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:27 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:27 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24440 
03/24/26-23:03:28 WARN  SyncController: Highlighting sentence 5 (scheduled+82ms) 
03/24/26-23:03:28 WARN  TTSEngine: Process watcher → normal completion, elapsed= 476 ms 
03/24/26-23:03:28 WARN  TTSEngine: onPlaybackComplete gen= 48 pid= 24440 
03/24/26-23:03:28 WARN  SyncController: Completion callback, concat ending at sentence 5 state= playing 
03/24/26-23:03:28 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:28 WARN  SyncController: readNextSentence idx= 6 / 12 state= playing 
03/24/26-23:03:28 WARN  SyncController: Using prefetched audio for sentence 6 
03/24/26-23:03:28 WARN  SyncController: beginSentencePlayback sentence 6 has_audio= true 
03/24/26-23:03:28 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404207_26.wav is_speaking= false 
03/24/26-23:03:28 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:28 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:28 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24446 
03/24/26-23:03:29 WARN  SyncController: Highlighting sentence 6 (scheduled+349ms) 
03/24/26-23:03:29 WARN  TTSEngine: Process watcher → normal completion, elapsed= 349 ms 
03/24/26-23:03:29 WARN  TTSEngine: onPlaybackComplete gen= 50 pid= 24446 
03/24/26-23:03:29 WARN  SyncController: Completion callback, concat ending at sentence 6 state= playing 
03/24/26-23:03:29 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:29 WARN  SyncController: readNextSentence idx= 7 / 12 state= playing 
03/24/26-23:03:29 WARN  SyncController: Using prefetched audio for sentence 7 
03/24/26-23:03:29 WARN  SyncController: beginSentencePlayback sentence 7 has_audio= true 
03/24/26-23:03:29 WARN  TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774404208_27.wav is_speaking= false 
03/24/26-23:03:29 WARN  TTSEngine: play() findPlayer took 0 ms 
03/24/26-23:03:29 WARN  TTSEngine: play() pre-launch took 0 ms 
03/24/26-23:03:29 WARN  TTSEngine: io.popen launch took 0 ms, PID= 24454 
03/24/26-23:03:29 WARN  SyncController: Highlighting sentence 7 (scheduled+82ms) 
03/24/26-23:03:29 WARN  TTSEngine: Process watcher → normal completion, elapsed= 466 ms 
03/24/26-23:03:29 WARN  TTSEngine: onPlaybackComplete gen= 52 pid= 24454 
03/24/26-23:03:29 WARN  SyncController: Completion callback, concat ending at sentence 7 state= playing 
03/24/26-23:03:29 WARN  SyncController: Scheduling next sentence in 0.1 s 
03/24/26-23:03:30 WARN  SyncController: Chain BLOCKED — state is STOPPED when timer fired 

[stradichenko]

The present racing issue has been addressed with some guards and the bug report has been extended to cover more information if issues persist (v0.1.5.2)

[thisf272-lang]

03/25/26-14:02:56 INFO Inhibiting user input
03/25/26-14:02:56 INFO Assistant: translate method overridden with AI Assistant
03/25/26-14:02:59 INFO Restoring user input handling
03/25/26-14:03:06 WARN Audiobook: Found word ' Hazelle ' via screen-pos at 8 (approx_offset= 14 screen_y= 36 dist= 6 )
03/25/26-14:03:06 WARN SyncController: start() — screen 1072 x 1448 mode= portrait rotation= 0
03/25/26-14:03:07 WARN SyncController: readNextSentence idx= 1 / 12 state= loading
03/25/26-14:03:07 WARN SyncController: Synthesizing sentence 1 ( I like Hazelle. )
03/25/26-14:03:07 WARN SyncController: beginSentencePlayback sentence 1 has_audio= true
03/25/26-14:03:07 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774458187_1.wav is_speaking= false
03/25/26-14:03:07 WARN TTSEngine: play() findPlayer took 0 ms
03/25/26-14:03:07 WARN TTSEngine: play() pre-launch took 0 ms
03/25/26-14:03:07 WARN TTSEngine: io.popen launch took 0 ms, PID= 31848
03/25/26-14:03:08 WARN SyncController: Highlighting sentence 1 (scheduled+1173ms)
03/25/26-14:03:08 WARN TTSEngine: Process watcher → normal completion, elapsed= 1676 ms
03/25/26-14:03:08 WARN TTSEngine: onPlaybackComplete gen= 1 pid= 31848
03/25/26-14:03:08 WARN SyncController: Completion callback, concat ending at sentence 1 state= playing
03/25/26-14:03:08 WARN SyncController: Scheduling next sentence in 0.1 s from sentence= 1 state= playing
03/25/26-14:03:08 WARN SyncController: readNextSentence idx= 2 / 12 state= playing
03/25/26-14:03:08 WARN SyncController: Using prefetched audio for sentence 2
03/25/26-14:03:08 WARN SyncController: beginSentencePlayback sentence 2 has_audio= true
03/25/26-14:03:08 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774458188_2.wav is_speaking= false
03/25/26-14:03:08 WARN TTSEngine: play() findPlayer took 0 ms
03/25/26-14:03:08 WARN TTSEngine: play() pre-launch took 0 ms
03/25/26-14:03:08 WARN TTSEngine: io.popen launch took 0 ms, PID= 31854
03/25/26-14:03:09 WARN SyncController: Highlighting sentence 2 (scheduled+349ms)
03/25/26-14:03:09 WARN TTSEngine: Process watcher → normal completion, elapsed= 349 ms
03/25/26-14:03:09 WARN TTSEngine: onPlaybackComplete gen= 3 pid= 31854
03/25/26-14:03:09 WARN SyncController: Completion callback, concat ending at sentence 2 state= playing
03/25/26-14:03:09 WARN SyncController: Scheduling next sentence in 0.1 s from sentence= 2 state= playing
03/25/26-14:03:09 WARN SyncController: readNextSentence idx= 3 / 12 state= playing
03/25/26-14:03:09 WARN SyncController: Using prefetched audio for sentence 3
03/25/26-14:03:09 WARN SyncController: beginSentencePlayback sentence 3 has_audio= true
03/25/26-14:03:09 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774458189_3.wav is_speaking= false
03/25/26-14:03:09 WARN TTSEngine: play() findPlayer took 0 ms
03/25/26-14:03:09 WARN TTSEngine: play() pre-launch took 0 ms
03/25/26-14:03:09 WARN TTSEngine: io.popen launch took 0 ms, PID= 31860
03/25/26-14:03:09 WARN SyncController: Highlighting sentence 3 (scheduled+90ms)
03/25/26-14:03:10 WARN TTSEngine: Process watcher → normal completion, elapsed= 524 ms
03/25/26-14:03:10 WARN TTSEngine: onPlaybackComplete gen= 5 pid= 31860
03/25/26-14:03:10 WARN SyncController: Completion callback, concat ending at sentence 3 state= playing
03/25/26-14:03:10 WARN SyncController: Scheduling next sentence in 0.1 s from sentence= 3 state= playing
03/25/26-14:03:10 WARN SyncController: readNextSentence idx= 4 / 12 state= playing
03/25/26-14:03:10 WARN SyncController: Using prefetched audio for sentence 4
03/25/26-14:03:10 WARN SyncController: beginSentencePlayback sentence 4 has_audio= true
03/25/26-14:03:10 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774458189_4.wav is_speaking= false
03/25/26-14:03:10 WARN TTSEngine: play() findPlayer took 0 ms
03/25/26-14:03:10 WARN TTSEngine: play() pre-launch took 0 ms
03/25/26-14:03:10 WARN TTSEngine: io.popen launch took 0 ms, PID= 31867
03/25/26-14:03:10 WARN SyncController: Highlighting sentence 4 (scheduled+338ms)
03/25/26-14:03:10 WARN TTSEngine: Process watcher → normal completion, elapsed= 338 ms
03/25/26-14:03:10 WARN TTSEngine: onPlaybackComplete gen= 7 pid= 31867
03/25/26-14:03:10 WARN SyncController: Completion callback, concat ending at sentence 4 state= playing
03/25/26-14:03:10 WARN SyncController: Scheduling next sentence in 0.1 s from sentence= 4 state= playing
03/25/26-14:03:11 WARN SyncController: readNextSentence idx= 5 / 12 state= playing
03/25/26-14:03:11 WARN SyncController: Using prefetched audio for sentence 5
03/25/26-14:03:11 WARN SyncController: beginSentencePlayback sentence 5 has_audio= true
03/25/26-14:03:11 WARN TTSEngine: play() called, audio_file= /tmp/audiobook_tts_1774458190_5.wav is_speaking= false
03/25/26-14:03:11 WARN TTSEngine: play() findPlayer took 0 ms
03/25/26-14:03:11 WARN TTSEngine: play() pre-launch took 0 ms
03/25/26-14:03:11 WARN TTSEngine: io.popen launch took 0 ms, PID= 31873
03/25/26-14:03:11 WARN SyncController: Highlighting sentence 5 (scheduled+90ms)
03/25/26-14:03:11 WARN TTSEngine: Process watcher → normal completion, elapsed= 517 ms
03/25/26-14:03:11 WARN TTSEngine: onPlaybackComplete gen= 9 pid= 31873
03/25/26-14:03:11 WARN SyncController: Completion callback, concat ending at sentence 5 state= playing
03/25/26-14:03:11 WARN SyncController: Scheduling next sentence in 0.1 s from sentence= 5 state= playing
03/25/26-14:03:11 WARN SyncController: stop() from state= playing sentence= 5 / 12 caller:
stack traceback:
plugins/audiobook.koplugin/synccontroller.lua:1013: in function 'on_close'
plugins/audiobook.koplugin/playbackbar.lua:266: in function 'onClose'
plugins/audiobook.koplugin/playbackbar.lua:135: in function 'callback'
frontend/ui/widget/button.lua:482: in function 'handleEvent'
frontend/ui/widget/container/inputcontainer.lua:266: in function 'handleEvent'
frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
...
frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
frontend/ui/widget/container/widgetcontainer.lua:83: in function 'propagateEvent'
frontend/ui/widget/container/widgetcontainer.lua:101: in function 'handleEvent'
frontend/ui/uimanager.lua:882: in function 'sendEvent'
frontend/ui/uimanager.lua:53: in function 'default'
frontend/ui/uimanager.lua:1423: in function 'handleInputEvent'
frontend/ui/uimanager.lua:1523: in function 'handleInput'
frontend/ui/uimanager.lua:1567: in function 'run'
./reader.lua:280: in main chunk
[C]: at 0x00013ed5
03/25/26-14:03:11 WARN SyncController: Stopped
03/25/26-14:03:12 WARN SyncController: Chain BLOCKED — state is STOPPED when timer fired (was scheduled after sentence 5 )

[stradichenko]

Thank you for submitting reports; Some improvements have been made in the upcoming v0.1.5.5.

[stradichenko]

Hi @thisf272-lang , there have been many updates (around 30 bug fixes!) since the last version. Please check v.0.1.5.35 if you still have issues, generate a report and benchmark and we can address them.

Cheers

[thisf272-lang]

Hi @thisf272-lang , there have been many updates (around 30 bug fixes!) since the last version. Please check v.0.1.5.35 if you still have issues, generate a report and benchmark and we can address them.

Cheers

Hey, here is the latest bug report and benchmark on v0.1.5.36

audiobook-bug-report-20260407-030859.txt
audiobook-benchmark-20260407-030708.txt

[stradichenko]

Thanks for the report and benchmark! Your device also falls into the "no tts.orchestrator, no wavparse" category (kindle_tts_orch_started: n/a, no_real_audio_output: yes), same as issue #13.

The benchmark was useful too, espeak synthesis is very fast on your device (6-8ms), but Piper struggles with medium and long texts. It looks like the model load takes ~10s each attempt and then runs out of memory on the longer sentences (your device has 2 cores / ~475MB RAM). That's expected for Piper on lower-spec Kindles, espeak will remain a safe choice if you struggle too much.

v0.1.5.38 adds a new audio path for these devices: a tiny bundled C helper (kindle-gst-play) that reads the WAV header itself and feeds raw PCM directly into GStreamer's mixersink, completely bypassing the missing wavparse plugin. No changes to the Kindle filesystem needed, it uses dlopen to load GStreamer at runtime.

This is still untested on real hardware (we need to cross-compile and bundle the binary first), but the --probe diagnostic will tell us immediately whether mixersink accepts raw PCM caps. Your next bug report will include that probe output automatically.

[stradichenko]

Hi @thisf272-lang , could you check if the issue has been solved? otherwise please share a report to keep finding a way to solve it.

Cheers.