204 lines
8.1 KiB
HTML
204 lines
8.1 KiB
HTML
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<h2>Overview of Operations</h2>
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<table class="dl">
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<tr><th><kbd class="menu">Session > Open Video…</kbd></th>
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<td>Add/replace a video to/on the timeline</td></tr>
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<tr><th><kbd class="menu">Window > Video Monitor</kbd></th>
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<td>Open/close external video monitor window</td></tr>
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<tr><th><kbd class="menu">View > Video Monitor > …</kbd></th>
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<td>Various settings of the video monitor</td></tr>
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<tr><th><kbd class="menu">Session > Export > Export to Video File…</kbd></th>
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<td>Export session and multiplex with video-file</td></tr>
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<tr><th><kbd class="mouse">Left</kbd>-drag the video in the timeline</th>
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<td>Re-align video and move 'locked' audio-regions along</td></tr>
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<tr><th>Context-menu on the video-timeline: <kbd class="optoff">Lock</kbd></th>
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<td>Prevent accidental drags</td></tr>
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<tr><th>Audio region context menu: <kbd class="menu"><em>Name_Of_The_Region</em> > Position > Lock to video</kbd></th>
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<td>Mark audio region(s) to be moved along with the video.</td></tr>
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</table>
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<h2>Adding a video</h2>
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<p>
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Adding a video is a two-step process: selecting a video file, and choosing
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import mode and optionally selecting an audio track to extract. Only one video
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can be present in the session, so opening a video when one is already opened
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results in replacing the video.
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</p>
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<h3 class="clear">Launching the video server (optional)</h3>
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<figure class="right">
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<img class="mini" src="/images/launch_video_server.png" alt="The Launch Video Server dialog">
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<figcaption>
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The Launch Video Server dialog
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</figcaption>
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</figure>
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<p>
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Importing a video makes Ardour start the video server automatically. If
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the <kbd class="option">Show video Server Startup Dialog</kbd> option in the
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<kbd class="menu">Video</kbd> section of the
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<a href="@@preferences#preferences-video">preferences</a> is checked, the
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<kbd class="menu">Launch Video Server</kbd> window is shown, allowing more
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complex operations, e.g. connecting to a remote video server instead of a local
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one.
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</p>
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<h3 class="clear">Selecting a file</h3>
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<figure class="right">
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<img class="mini" src="/images/set_video_track.png" alt="The video open dialog">
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<figcaption>
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The video open dialog
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</figcaption>
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</figure>
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<p>
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This step is rather straight-forward. The panel on the right side
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allows to seek through the video and displays basic file information.
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It is also useful to check if the video format/codec is supported.
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</p>
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<p>
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The lower part of the window shows some options:
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</p>
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<ul>
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<li><kbd class="option">Open Video Monitor Window</kbd> to automatically show
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the video monitor (Harvid). This can also be done later by using the
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<kbd class="menu">Window > Video Monitor</kbd> menu which is binded to
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<kbd class="mod2">V</kbd> by default.</li>
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<li><kbd class="option">Adjust Session Framerate to Match Video Framerate</kbd>
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which can also be set later with the <a href="@@session-properties">Session Properties</a>.
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Having the session and video framerate at the same value allows their sync not to
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drift off.</li>
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</ul>
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<h3 class="clear">Import options</h3>
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<figure class="right">
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<img class="mini" src="/images/transcode-import_video_file.png" alt="The Transcode/Import Video dialog">
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<figcaption>
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The Transcode/Import Video dialog
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</figcaption>
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</figure>
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<p>
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This step analyzes the video file in more detail and offers import options:
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</p>
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<table class="dl">
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<tr><th><kbd class="menu">Import/Transcode Video to Session</kbd></th>
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<td>This is the default. The video will be imported in a suitable
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video format/codec for the timeline and video monitor and saved inside the
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session folder. A location other than the session folder can also be
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chosen (external disk, or network storage of the video server on a different
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machine) by using the <kbd class="menu">Output File:</kbd> field.</td></tr>
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<tr><th><kbd class="menu">Reference from Current Location (Previously Transcoded
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Files Only)</kbd></th>
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<td>Only useful for opening files that were previously encoded (are already
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in a good format/codec for Ardour). Should be used with care.</td></tr>
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<tr><th><kbd class="menu">Do not Import Video (Audio Import Only)</kbd></th>
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<td>Useful for extracting audio only.</td></tr>
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</table>
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<p>
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By default the video is imported using the original width/height.
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If it is a large video (e.g. Full HD), it makes sense to scale it down
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to decrease the CPU load and disk I/O required to decode and play the
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file.
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</p>
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<p>
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A small, low-quality representation of the image is usually sufficient
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for editing soundtracks. The default bitrate in kbit/sec is set to use
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0.7 bits per pixel (in comparison, the average DVD medium uses 5000 kbit/s;
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at PAL resolution this is about 0.5 bits per pixel, but the DVD is
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using the <dfn>mpeg2</dfn>—a denser compression algorithm than the
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<dfn>mjpeg</dfn> codec used by Ardour).
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</p>
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<p>
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The <kbd class="menu">Extract Audio:</kbd> offers options regarding the Audio
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part of the stream, allowing to either not extract audio, or to choose which audio
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stream to add to the session.
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</p>
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<p>
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When extracting any audio, if it includes <a href="@@timecode-generators-and-slaves">
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LTC timecodes</a>, those can be extracted and used to sync the video by checking
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the option below.
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</p>
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<h2>Working with A/V</h2>
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<p>
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Working with A/V in Ardour is similar to working in a pure audio setup, except
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for the presence of a video timeline in the <a href="@@ruler">ruler</a> zone,
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and a Xjadeo video window, showing a preview of the result.
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</p>
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<figure class="center">
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<img class= "mini" src="/images/video_timeline.png" alt="The Video Timeline">
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<figcaption>
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The Video Timeline
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</figcaption>
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</figure>
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<p>
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The Xjadeo window supports some user interactions, such as showing some OSD
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information or changing the zoom level. Xjadeo's documentation is available
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on its <a href="http://xjadeo.sourceforge.net/xjadeo.html#heading8">website</a>.
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</p>
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<h2 id="export">Exporting Video</h2>
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<figure class="right">
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<img class="mini" src="/images/export_video_file.png" alt="The Video Export Dialog">
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<figcaption>
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The Video Export Dialog
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</figcaption>
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</figure>
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<p>
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The video export will take audio from the current Ardour session and
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multiplex it with a video file. The soundtrack of the video is taken from
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an audio export of Ardour's master bus.
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</p>
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<p>
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An arbitrary video file can be chosen. For high quality exports, the
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original file (before it was imported into the timeline) should be used.
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This is the default behaviour if that file can be found. If not, Ardour
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will fall back to the imported proxy-video which is currently in use
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on the timeline. Any existing audio tracks on this video file are stripped.
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</p>
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<p>
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The range selection allows to cut or extend the video. If the session is
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longer than the video duration, black frames are prefixed or appended to
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the video. (Note: this process may fail with non-standard pixel aspect
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ratios). If Ardour's session range is shorter, the video will be cut accordingly.
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</p>
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<p>
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Audio sample rate and normalization are options for Ardour's audio exporter.
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The remaining settings are options that are directly passed on to ffmpeg.
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</p>
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<p>
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The file format is determined by the extension chosen for it
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(.avi, .mov, .flv, .ogv, .webm,…).
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Note: not all combinations of format, codec, and settings produce files
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which are according to specifications. For example, flv files require
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sample rates of 22.1 kHz or 44.1 kHz, mpeg containers can not
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be used with AC-3 audio codec, etc. If in doubt, one of the built-in
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presets should be used.
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</p>
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<p>
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Ardour's video exporter is not recommended for mastering! While ffmpeg
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(which is used by Ardour) can produce high-quality files, this export
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lacks the possibility to tweak many settings. We recommend using
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<a href="http://www.biggmatt.com/winff/">winff</a>,
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<a href="http://www.rastersoft.com/programas/devede.html">devede</a> or
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<a href="http://dvdauthor.sourceforge.net/">dvdauthor</a> to mux and master.
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Nevertheless this video exporter comes in handy to do quick snapshots,
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intermediates, dailies or online videos.
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</p>
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