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Add rtl_fm raw output capture for diagnostics

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- Use tee to capture rtl_fm raw output to /tmp/rtl_fm_raw.bin
- Log raw file size during stream timeouts
- Helps determine if rtl_fm is producing any data at all

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-01-15 16:54:13 +00:00
parent a3fd6881df
commit 43f0f1cbfc
1 changed files with 10 additions and 2 deletions
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routes/listening_post.py
+10 -2
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@@ -442,7 +442,9 @@ def _start_audio_stream(frequency: float, modulation: str):
# Log stderr to temp files so we can see any errors from rtl_fm and ffmpeg
rtl_stderr_log = '/tmp/rtl_fm_stderr.log'
ffmpeg_stderr_log = '/tmp/ffmpeg_stderr.log'
shell_cmd = f"{' '.join(sdr_cmd)} 2>{rtl_stderr_log} | {' '.join(encoder_cmd)} 2>{ffmpeg_stderr_log}"
rtl_raw_output = '/tmp/rtl_fm_raw.bin'
# Use tee to capture rtl_fm raw output for diagnostics while also piping to ffmpeg
shell_cmd = f"{' '.join(sdr_cmd)} 2>{rtl_stderr_log} | tee {rtl_raw_output} | {' '.join(encoder_cmd)} 2>{ffmpeg_stderr_log}"
logger.info(f"Starting audio pipeline: {shell_cmd}")
audio_rtl_process = None # Not used in shell mode
@@ -943,7 +945,13 @@ def stream_audio() -> Response:
logger.warning(f"Audio stream: empty chunk after {bytes_sent} bytes, iterations={iterations}")
break
else:
logger.warning(f"Audio stream: select timeout after {bytes_sent} bytes, iterations={iterations}, poll={audio_process.poll()}")
# Check raw rtl_fm output file size
raw_size = 0
try:
raw_size = os.path.getsize('/tmp/rtl_fm_raw.bin')
except:
pass
logger.warning(f"Audio stream: select timeout after {bytes_sent} bytes, iterations={iterations}, poll={audio_process.poll()}, rtl_raw_size={raw_size}")
# Check for errors on timeout
try:
with open('/tmp/ffmpeg_stderr.log', 'r') as f: