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PONode.js asynchronous video conversion slow
 

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  1. PONode.js asynchronous video conversion slow
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    <p>I wrote a little website/service, which can download a video from a website (currently Youtube) and converts it on the fly to an mp3 file and sends this file back as the response.</p> <p>For example, you when you request <a href="http://localhost:8000/v=http://www.youtube.com/watch?v=HhoewflkQu0" rel="nofollow">http://localhost:8000/v=http://www.youtube.com/watch?v=HhoewflkQu0</a>, then it will download this video and response the audio layer encoded in MP3.</p> <p>This all works very well, my problem is that this is very slow and I can't figure out why.</p> <hr> <p>Simplified the script behaves like this:</p> <p>Download the video and write it to the stdin of ffmpeg, and the stdout goes to the response. Video (MP4, FLV) -> FFMPEG -> MP3</p> <p>I used curl to figure out how fast the script is:</p> <pre><code>$ curl http://localhost:8000/v=http://www.youtube.com/watch?v=HhoewflkQu0 </code></pre> <p>I get only about 5-10k.</p> <p>So why is this so slow?</p> <ol> <li>The server, from which I am downloading the video is slow.</li> <li>The conversion is slow (because of a slow CPU).</li> <li>The data transfer between node.js -> FFMPEG is slow.</li> </ol> <p>I tried to download the video in a normal download manager, and i got about 320k, which is my normal download speed, so the first point isn't the bottleneck.</p> <p>To point 2 and 3, I tried to write a local file to the stdin, and I got about 600k so that isn't it either.</p> <p>So why is my script so slow, and what can I do to make it faster?</p> <p><a href="https://gist.github.com/1304637" rel="nofollow">https://gist.github.com/1304637</a></p> <p>Thanks in advance.</p>
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    1. COconversion in javascript would be slow. If your using C for the conversion then it should be faster. Your web server may have a slow out going transfer rate compared to other larger servers.
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    2. COthe conversion is done using ffmpeg, I'm just feeding it with the data using js.
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    3. COWell I believe the conversation is slow and is capping the speed. Try to benchmark the conversation to see if that's the problem or not.
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      1. USFarid Nouri Neshat
 

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