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POUnhandled stream error in pipe: write EPIPE in Node.js
 

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  1. POUnhandled stream error in pipe: write EPIPE in Node.js
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    <p>The idea is to serve screenshots of RTSP video stream with Express.js server. There is a continuously running spawned openRTSP process in flowing mode (it's stdout is consumed by another ffmpeg process):</p> <pre><code>function spawnProcesses (camera) { var openRTSP = spawn('openRTSP', ['-c', '-v', '-t', camera.rtsp_url]), encoder = spawn('ffmpeg', ['-i', 'pipe:', '-an', '-vcodec', 'libvpx', '-r', 10, '-f', 'webm', 'pipe:1']); openRTSP.stdout.pipe(encoder.stdin); openRTSP.on('close', function (code) { if (code !== 0) { console.log('Encoder process exited with code ' + code); } }); encoder.on('close', function (code) { if (code !== 0) { console.log('Encoder process exited with code ' + code); } }); return { rtsp: openRTSP, encoder: encoder }; } ... camera.proc = spawnProcesses(camera); </code></pre> <p>There is an Express server with single route:</p> <pre><code>app.get('/cameras/:id.jpg', function(req, res){ var camera = _.find(cameras, {id: parseInt(req.params.id, 10)}); if (camera) { res.set({'Content-Type': 'image/jpeg'}); var ffmpeg = spawn('ffmpeg', ['-i', 'pipe:', '-an', '-vframes', '1', '-s', '800x600', '-f', 'image2', 'pipe:1']); camera.proc.rtsp.stdout.pipe(ffmpeg.stdin); ffmpeg.stdout.pipe(res); } else { res.status(404).send('Not found'); } }); app.listen(3333); </code></pre> <p>When i request <code>http://localhost:3333/cameras/1.jpg</code> i get desired image, but from time to time app breaks with error:</p> <pre><code>stream.js:94 throw er; // Unhandled stream error in pipe. ^ Error: write EPIPE at errnoException (net.js:901:11) at Object.afterWrite (net.js:718:19) </code></pre> <p>Strange thing is that sometimes it successfully streams image to <code>res</code> stream and closes child process without any error, but, sometimes, streams image and falls down.</p> <p>I tried to create <code>on('error', ...)</code> event handlers on every possible stream, tried to change <code>pipe(...)</code> calls to <code>on('data',...)</code> constructions, but could not succeed.</p> <p>My environment: node v0.10.22, OSX Mavericks 10.9.</p> <p><strong>UPDATE:</strong></p> <p>I wrapped <code>spawn('ffmpeg',...</code> block with try-catch: </p> <pre><code>app.get('/cameras/:id.jpg', function(req, res){ .... try { var ffmpeg = spawn('ffmpeg', ['-i', 'pipe:', '-an', '-vframes', '1', '-s', '800x600', '-f', 'image2', 'pipe:1']); camera.proc.rtsp.stdout.pipe(ffmpeg.stdin); ffmpeg.stdout.pipe(res); } catch (e) { console.log("Gotcha!", e); } .... }); </code></pre> <p>... and this error disappeared, but log is silent, it doesn't catch any errors. What's wrong?</p>
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    1. USMichael Romanenko
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