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| author |  gpoirier <gpoirier@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2005-08-14 22:25:02 +0000 |
|---|---|---|
| committer | gpoirier <gpoirier@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2005-08-14 22:25:02 +0000 |
| commit | 3bb469246d4f3a0fc767102cc14304e8711edf5c (patch) | |
| tree | 7dd371821025d9310d42b5fc9640e1c72e5ebeef /DOCS/xml/en/encoding-guide.xml | |
| parent | 0f10868e3d7e5379b56f3cce9cc391e8d9c17ee6 (diff) | |
NTSC sources are hard to encode. How to identify telecine content reliably.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16226 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'DOCS/xml/en/encoding-guide.xml')
| -rw-r--r-- | DOCS/xml/en/encoding-guide.xml | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/DOCS/xml/en/encoding-guide.xml b/DOCS/xml/en/encoding-guide.xml index a77f1833ae..448ed867fb 100644 --- a/DOCS/xml/en/encoding-guide.xml +++ b/DOCS/xml/en/encoding-guide.xml @@ -63,10 +63,12 @@ presentation on a television, and often does <emphasis role="bold">not</emphasis> correspond to the original format of the movie. + Experience shows that NTSC contents are a lot more difficult to encode + given that there more elements to identify in the source. In order to produce a suitable encode, you need to know the original format. Failure to take this into account will result in ugly combing - (interlacing) artifacts in your encode. + (interlacing) artifacts, duplicated or lost frames in your encode. Besides being ugly, the artifacts also harm coding efficiency: You will get worse quality per bitrate. </para> @@ -209,8 +211,8 @@ encoded MPEG-2. </para> <para> - The procedures for dealing with these cases will be covered later - in this guide. + The procedures for dealing with these cases will be covered + <link linkend="menc-feat-telecine">later in this guide</link>. For now, we leave you with some guides to identifying which type of material you are dealing with: </para> @@ -1686,6 +1688,20 @@ Note the <option>ilmv</option> and <option>ildct</option> options. "hard-telecine". Since hard-telecine is already 60000/1001 fields per second, the DVD player plays the video without any manipulation. </para> + +<para> + Another way to tell if your source is telecined or not is to watch the + the source appending <option>-vf pullup -v</option> to your command line + to see how <option>pullup</option> matches frames. + If the source is telecined, you should see on the console a 3:2 pattern + with <systemitem>0+.1.+2</systemitem> and <systemitem>0++1</systemitem> + alternating. + This technique has the advantage that you do not need to watch the + source to identify it, which could be useful if you wish to automate + the encoding procedure, or to carry out said procedure remotely via + a slow connection. +</para> + </sect3> <sect3 id="menc-feat-telecine-ident-interlaced"> |