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Document recording with transparency in Creating movies

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- Add more FFmpeg tips such as `-preset veryslow`.
- Fix `-r` usage in FFmpeg commands.
- Remove leftover `-preset veryfast` (it wasn't meant to be here).
This commit is contained in:
Hugo Locurcio
2022-10-09 00:39:40 +02:00
parent b69855897a
commit 0d6af3011e
1 changed files with 25 additions and 4 deletions
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29
tutorials/animation/creating_movies.rst
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@@ -148,9 +148,17 @@ PNG
^^^
PNG image sequence for video and WAV for audio. Features lossless video
compression, at the cost of large file sizes and slow encoding. This is designed to be
compression, at the cost of large file sizes and slow encoding. This is designed
to be
:ref:`encoded to a video file with an external tool after recording <doc_creating_movies_converting_avi>`.
Transparency is currently not supported, even if the root viewport is set to be transparent.
Transparency is supported, but the root viewport **must** have its
``transparent_bg`` property set to ``true`` for transparency to be visible on
the output image. This can be achieved by enabling the **Rendering > Transparent
Background** advanced project setting. **Display > Window > Size > Transparent**
and **Display > Window > Per Pixel Transparency > Enabled** can optionally be
enabled to allow transparency to be previewed while recording the video, but
they do not have to be enabled for the output image to contain transparency.
To use PNG, specify a ``.png`` file to be created in the
**Editor > Movie Writer > Movie File** project setting. The generated ``.wav``
@@ -290,6 +298,11 @@ well-suited for platforms that will re-encode your videos to reduce their size
To get a smaller file at the cost of quality, *increase* the CRF value in the
above command.
To get a file with a better size/quality ratio (at the cost of slower encoding
times), add ``-preset veryslow`` before ``-crf 15`` in the above command. On the
contrary, ``-preset veryfast`` can be used to achieve faster encoding at the
cost of a worse size/quality ratio.
.. _doc_creating_movies_converting_image_sequence:
Converting PNG image sequence + WAV audio to a video
@@ -310,7 +323,15 @@ or sped up, and audio will be out of sync with the video.
::
ffmpeg -i input%08d.png -i input.wav -r 60 -crf 15 output.mp4
ffmpeg -r 60 -i input%08d.png -i input.wav -crf 15 output.mp4
If you recorded a PNG image sequence with transparency enabled, you need to use
a video format that supports storing transparency. MP4/H.264 doesn't support
storing transparency, so you can use WebM/VP9 as an alternative:
::
ffmpeg -r 60 -i input%08d.png -i input.wav -c:v libvpx-vp9 -crf 15 -pix_fmt yuva420p output.webm
.. _doc_creating_movies_motion_blur:
@@ -336,7 +357,7 @@ while preserving its existing aspect ratio:
::
ffmpeg -i input.avi -vf "scale=-1:1080" -crf 15 -preset veryfast output.mp4
ffmpeg -i input.avi -vf "scale=-1:1080" -crf 15 output.mp4
.. _doc_creating_movies_reducing_framerate: