119 lines
5.0 KiB
HTML
119 lines
5.0 KiB
HTML
---
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layout: default
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title: Workflow & Operations
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---
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<h2>Overview of Operations</h2>
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<dl class="wide-table">
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<dt><kbd class="menu">Session > Open Video</kbd></dt>
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<dd>Add/replace a video to/on the timeline</dd>
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<dt><kbd class="menu">Window > View Monitor</kbd></dt>
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<dd>Open/close external video monitor window</dd>
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<dt><kbd class="menu">View > Video Monitor > …</kbd></dt>
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<dd>Various settings of the video monitor</dd>
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<dt><kbd class="menu">Session > Export > Video</kbd></dt>
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<dd>Export session and multiplex with video-file</dd>
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<dt><kbd class="mouse">Left</kbd>-drag the video in the timeline</dt>
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<dd>Re-align video and move 'locked' audio-regions along</dd>
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<dt>Context-menu on the video-timeline: <kbd class="menu"> 'lock'</kbd></dt>
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<dd>Prevent accidental drags</dd>
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<dt>Audio region context menu: <kbd class="menu">Position > Lock to video</kbd></dt>
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<dd>Mark audio region(s) to be moved along with the video.</dd>
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</dl>
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<h2>Adding Video</h2>
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<p>
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Adding video is a two-step process: select a video file, and choose
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import mode and optionally select an audio track to extract.
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</p>
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<p>
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The first 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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<img src="/images/a3_video_open.png" alt="video-open-dialog" width="300" />
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<p>
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The second step analyzes the video file in more detail and offers import options:
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</p>
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<dl>
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<dt><kbd class="menu">Import/Transcode to Session</kbd></dt>
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<dd>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).</dd>
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<dt><kbd class="menu">Reference from Current Location</kbd></dt>
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<dd>Only useful for opening files that were previously encoded (are already
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in a good format/codec). Use with care.</dd>
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<dt><kbd class="menu">Do not Import Video</kbd></dt>
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<dd>Useful for extracting audio only.</dd>
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</dl>
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<img src="/images/a3_video_import.png" alt="Video Import Dialog" width="300" />
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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.<br />
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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. (Compare: 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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<h2>Working with A/V</h2>
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<p>
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Well now,..
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</p>
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<img src="/images/a3_videotimeline.png" alt="Video Timeline" width="600" />
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<h2 id="export">Exporting Video</h2>
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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 samplerate 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 that you choose 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 ac3 audio-codec, etc. If in doubt, use one of the built-in
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presets.
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</p>
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<img src="/images/a3_video_export.png" alt="Video Export Dialog" width="300" />
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<p>
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Ardour video export 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 to use winff,
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devede or dvdauthor to mux & master. Nevertheless this video-export c
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omes in handy to do quick snapshots, intermediates, dailies or online videos.
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</p>
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