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POJava HTTP process for 'streaming' video file
 

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    <p>I am creating a Java application which 'streams' a video file over http to a browser (currently Chrome v24.x). This video is sent to FFmpeg and the output of this is sent over HTTP. </p> <p>Now, once the file is completely encoded the file is served using chunked transfer, and responding to range requests. Example headers:</p> <h3>Request</h3> <pre><code>GET /file/9fe6b502-c127-47c2-b6d2-83ea58676a8d HTTP/1.1 : Host: localhost:1234 : Connection: keep-alive : Accept-Encoding: identity;q=1, *;q=0 : User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.56 Safari/537.17 : Accept: */* : Referer: http://localhost:1234/media/9fe6b502-c127-47c2-b6d2-83ea58676a8d : Accept-Language: en-US,en;q=0.8 : Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 : Cookie: plushContainerWidth=100%25; plushNoTopMenu=0 : Range: bytes=0- : </code></pre> <h3>Response</h3> <pre><code>HTTP/1.1 206 Partial Content : Connection: close : Date: Mon, 28 Jan 2013 14:51:52 GMT : Content-Type: video/mp4 : Etag: "9fe6b502-c127-47c2-b6d2-83ea58676a8d" : Accept-Ranges: bytes : Content-Range: bytes 0-625825/625826 : Content-Length: 625826 : Transfer-Encoding: chunked : </code></pre> <p>Data sent is 625826 bytes, excluding header data and chunked overhead. </p> <p>Now, this works just fine!</p> <p>The trouble is when the GET request happens before the file encoding has completed. I have tried to start sending the file straight away, over HTTP, using just chunked transfer with no content length attributes or ranges because they are not currently known. This causes the browser to wait for the full file (and not start playing until the transfer has completed). In addition, when the file transfer is completed, the browser reports a video error that the file could not be played. Example headers:</p> <h3>Request</h3> <pre><code>Request : GET /file/9fe6b502-c127-47c2-b6d2-83ea58676a8d HTTP/1.1 : Host: localhost:1234 : Connection: keep-alive : Accept-Encoding: identity;q=1, *;q=0 : User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.56 Safari/537.17 : Accept: */* : Referer: http://localhost:1234/media/9fe6b502-c127-47c2-b6d2-83ea58676a8d : Accept-Language: en-US,en;q=0.8 : Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 : Cookie: plushContainerWidth=100%25; plushNoTopMenu=0 : Range: bytes=0- </code></pre> <h3>Response</h3> <pre><code>HTTP/1.1 200 OK : Connection: close : Date: Mon, 28 Jan 2013 14:51:29 GMT : Content-Type: video/mp4 : Transfer-Encoding: chunked </code></pre> <p>Data sent is 625826 bytes, excluding header data and chunked overhead. </p> <p>Does anyone have any ideas what's going wrong, or how to start playing a video without knowing the full length of the file? </p> <p>Thanks for your time, </p> <p>James. </p> <p>//EDIT</p> <p>As the request for the incomplete file states 'Range: bytes=0-' - can I reply with a partial content of 'n' bytes (say, 1000 bytes) with Content-Range: bytes 0-999/* ?</p> <p>//EDIT 2 As requested, here is my code for outputting the file. This is condensed as the code actually spans several classes.</p> <pre><code>File f = new File(_filename); RandomAccessFile raf = new RandomAccessFile(f, "r"); ChunkedOutputStream cos = new ChunkedOutputStream(_out, 1024 * 100); byte[] bytes; while (true){ lBufferSizeMax = Math.min(lBufferSize, fc.length() - lCompleted); bytes = new byte[(int)lBufferSizeMax]; lCurrentRead = fc.read(bytes); if (lCurrentRead == 0){ break; } cos.write(bytes); } </code></pre>
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    1. COPlease, show the code of how you write to `OutputStream` video-file contents.
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    2. COIt's not the output code, that works fine as the same code is used for outputting video before and after transcoding is complete. This is a question around headers, and what the browser expects to happen given requests and how range requests work with unknown file sizes.
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    3. COProgrammically you should set size of file, which you are writing to `outputStream`, '-1'.
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