<br><br><div class="gmail_quote">On 11 March 2012 21:43, Nick Rout <span dir="ltr"><<a href="mailto:nick.rout@gmail.com">nick.rout@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On Mon, Mar 12, 2012 at 9:55 AM, David Crawford<br>
<<a href="mailto:davidcrawford83@gmail.com">davidcrawford83@gmail.com</a>> wrote:<br>
><br>
><br>
> On 11 March 2012 20:46, Raymond Wagner <<a href="mailto:raymond@wagnerrp.com">raymond@wagnerrp.com</a>> wrote:<br>
>><br>
>> On 3/11/2012 16:40, David Crawford wrote:<br>
>> > I have been using both MythTV in Linux and DVBViewer on windows and<br>
>> > ive noticed that recordings made in Myth are roughly double the size<br>
>> > as those made in DVBViewer. Why is that?<br>
>><br>
>> DVBViewer must be transcoding the recording. Either that, or you've got<br>
>> a ton of data coming in over MHEG, that DVBViewer is discarding but<br>
>> MythTV is storing for later use.<br>
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><br>
><br>
> DVBViewer is recording files as .ts, doesn't that mean nothing should be<br>
> transcoded?<br>
><br>
> Also, quite often with Myth data isn't being captured such as Teletext or<br>
> DVB subtitles. This is not the case in DVBViewer it will capture both<br>
> everytime and you can select if you want to record those streams or not.<br>
> What are the possible reasons why Myth isnt capturing these? (apart from the<br>
> fact that the streams are not being carried on the program/channel).<br>
<br>
</div></div>Instead of speculating why don't you run some files through mediainfo<br>
or similar and see where the differences lie.<br>
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</div></div></blockquote></div><br><div>Thanks for that, checked out 2 recordings of UK Sky news on DVBViewer and on Myth. You can see the info for both below. Know idea where the difference's lie however, can anyone explain why the file sizes are different and why one has teletext subtitles and the other no? (info says there are teletext subs but i cant rip them with projectx or open them, although making another recording straight after had the subtitles and was a continuation of the same show).</div>
<div><br></div><div>DVBViewer recording:</div><div><br></div><div><div>General</div><div>ID : 2026 (0x7EA)</div><div>Complete name : Y:\02-03_18-58-01_Sky News_News, Sport, Weather - 60.ts</div>
<div>Format : MPEG-TS</div><div>File size : 1.33 GiB</div><div>Duration : 1h 3mn</div><div>Overall bit rate mode : Variable</div>
<div>Overall bit rate : 2 986 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>Codec ID : 2</div><div>Duration : 1h 3mn</div><div>Bit rate mode : Variable</div>
<div>Bit rate : 2 645 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) : 0.261</div><div>Stream size : 1.18 GiB (89%)</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 : 1h 3mn</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 : -651ms</div><div>Stream size : 87.9 MiB (6%)</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>MythTV Recording:</div><div><br></div><div><div>General</div><div>ID : 2026 (0x7EA)</div><div>Complete name : Y:\mythtv\5704_20120311063000.mpg</div>
<div>Format : MPEG-TS</div><div>File size : 943 MiB</div><div>Duration : 29mn 51s</div><div>Overall bit rate mode : Variable</div>
<div>Overall bit rate : 4 416 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>Codec ID : 2</div><div>Duration : 29mn 51s</div><div>Bit rate mode : Variable</div>
<div>Bit rate : 4 004 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) : 0.395</div><div>Stream size : 855 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 51s</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 : -610ms</div><div>Stream size : 41.0 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><br></div>