<br><br><div class="gmail_quote">On 12 March 2012 00:42, Raymond Wagner <span dir="ltr"><<a href="mailto:raymond@wagnerrp.com">raymond@wagnerrp.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 3/11/2012 19:45, David Crawford wrote:<br>
> can anyone explain why the file sizes are different<br>
><br>
> DVBViewer recording:<br>
> Video Bit rate : 2 645 Kbps<br>
><br>
> MythTV Recording:<br>
> Video Bit rate : 4 004 Kbps<br>
<br>
Because they were recorded at two different times, during which the<br>
broadcaster's encoder was running using different parameters. Both<br>
DVBViewer and MythTV are recording the video as it is sent by the<br>
broadcaster. The broadcaster was simply sending more data during the<br>
show MythTV was recording.<br>
<br>
> and why one has teletext subtitles and the other no<br>
><br>
> DVBViewer recording:<br>
> ID : 512 (0x200)<br>
> Menu ID : 4704 (0x1260)<br>
><br>
> MythTV Recording:<br>
> ID : 512 (0x200)<br>
> Menu ID : 1 (0x1)<br>
<br>
My guess... it has something to do with the difference in this "Menu ID"<br>
value, however I don't know what that is.<br>
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</blockquote></div><br><div>The Menu ID is the "Service ID" for that channel. (as seen here : <a href="http://en.kingofsat.net/pack-skydigital.php">http://en.kingofsat.net/pack-skydigital.php</a>). You can change things like service ID and PID's easily in windows is there a way doing it with Myth?</div>
<div><br></div><div>Also, the reason for file size differences doesn't appear to be down to the fact that the broacaster has changed anything as the filesize differences seem to be pretty consistent over a large number of recoridngs made on 2 separate machines (1 DVBViewer and 1 MythTV). Below is the mediainfo of the exact same program recorded on both, its seems that the Bits/(Pixel*Frame) is where the difference lies . This time the subtitles were captured though, strangely enough.</div>
<div><br></div><div>Myth Recording:</div><div><br></div><div><div>General</div><div>ID : 2026 (0x7EA)</div><div>Complete name : Y:\mythtv\5704_20120312140000.mpg</div>
<div>Format : MPEG-TS</div><div>File size : 956 MiB</div><div>Duration : 29mn 43s</div><div>Overall bit rate mode : Variable</div>
<div>Overall bit rate : 4 497 Kbps</div><div><br></div><div>Video</div><div>ID : 512 (0x200)</div><div>Menu ID : 1 (0x1)</div>
<div>Format : MPEG Video</div><div>Format version : Version 2</div><div>Format profile : Main@Main</div><div>Format settings, BVOP : Yes</div>
<div>Format settings, Matrix : Custom</div><div>Format settings, GOP : M=3, N=12</div><div>Codec ID : 2</div><div>Duration : 29mn 43s</div>
<div>Bit rate mode : Variable</div><div>Bit rate : 4 081 Kbps</div><div>Maximum bit rate : 15.0 Mbps</div><div>Width : 704 pixels</div>
<div>Height : 576 pixels</div><div>Display aspect ratio : 16:9</div><div>Frame rate : 25.000 fps</div><div>Standard : PAL</div>
<div>Color space : YUV</div><div>Chroma subsampling : 4:2:0</div><div>Bit depth : 8 bits</div><div>Scan type : Interlaced</div>
<div>Scan order : Top Field First</div><div>Compression mode : Lossy</div><div>Bits/(Pixel*Frame) : 0.403</div><div>Stream size : 867 MiB (91%)</div>
<div><br></div><div>Audio</div><div>ID : 640 (0x280)</div><div>Menu ID : 1 (0x1)</div><div>Format : MPEG Audio</div>
<div>Format version : Version 1</div><div>Format profile : Layer 2</div><div>Codec ID : 4</div><div>Duration : 29mn 42s</div>
<div>Bit rate mode : Constant</div><div>Bit rate : 192 Kbps</div><div>Maximum bit rate : 1 726 Kbps</div><div>Channel(s) : 2 channels</div>
<div>Sampling rate : 48.0 KHz</div><div>Compression mode : Lossy</div><div>Delay relative to video : -490ms</div><div>Stream size : 40.8 MiB (4%)</div>
<div>Language : English</div><div><br></div><div>Text</div><div>ID : 576 (0x240)-888</div><div>Menu ID : 1 (0x1)</div>
<div>Format : Teletext Subtitle</div><div>Language : English</div></div><div><br></div><div>DVBVIEWER recording:</div><div><br></div><div><div>General</div>
<div>ID : 2026 (0x7EA)</div><div>Complete name : X:\03-12_14-00-23_Sky News_Sky News with Kay Burley - 30.ts</div><div>Format : MPEG-TS</div>
<div>File size : 569 MiB</div><div>Duration : 29mn 36s</div><div>Overall bit rate mode : Variable</div><div>Overall bit rate : 2 687 Kbps</div>
<div><br></div><div>Video</div><div>ID : 512 (0x200)</div><div>Menu ID : 4704 (0x1260)</div><div>Format : MPEG Video</div>
<div>Format version : Version 2</div><div>Format profile : Main@Main</div><div>Format settings, BVOP : Yes</div><div>Format settings, Matrix : Custom</div>
<div>Format settings, GOP : M=3, N=12</div><div>Codec ID : 2</div><div>Duration : 29mn 35s</div><div>Bit rate mode : Variable</div>
<div>Bit rate : 2 360 Kbps</div><div>Maximum bit rate : 15.0 Mbps</div><div>Width : 704 pixels</div><div>Height : 576 pixels</div>
<div>Display aspect ratio : 16:9</div><div>Frame rate : 25.000 fps</div><div>Standard : PAL</div><div>Color space : YUV</div>
<div>Chroma subsampling : 4:2:0</div><div>Bit depth : 8 bits</div><div>Scan type : Interlaced</div><div>Scan order : Top Field First</div>
<div>Compression mode : Lossy</div><div>Bits/(Pixel*Frame) : 0.233</div><div>Stream size : 500 MiB (88%)</div><div><br></div><div>Audio</div><div>
ID : 640 (0x280)</div><div>Menu ID : 4704 (0x1260)</div><div>Format : MPEG Audio</div><div>Format version : Version 1</div>
<div>Format profile : Layer 2</div><div>Codec ID : 4</div><div>Duration : 29mn 35s</div><div>Bit rate mode : Constant</div>
<div>Bit rate : 192 Kbps</div><div>Maximum bit rate : 1 726 Kbps</div><div>Channel(s) : 2 channels</div><div>Sampling rate : 48.0 KHz</div>
<div>Compression mode : Lossy</div><div>Delay relative to video : -450ms</div><div>Stream size : 40.6 MiB (7%)</div><div>Language : English</div>
<div><br></div><div>Text</div><div>ID : 576 (0x240)-888</div><div>Menu ID : 4704 (0x1260)</div><div>Format : Teletext Subtitle</div>
<div>Language : English</div></div><div><br></div><div><br></div>