feat(convert): support base64 encoded videos (#236)

* feat(convert): support base64 encoded videos

Thanks to @t-fritsch, Manim Slides can now convert to a fully self-contained HTML presentation using base64 encoded videos!

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* chore(lib): explicit decode type

* feat(lib): auto detect mime type

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/tests.yml

@@ -43,7 +43,7 @@ jobs:
         poetry install --with test
 
     - name: Run pytest
-      run: poetry run pytest
+      run: poetry run pytest -x
 
   build-examples:
     strategy:

manim_slides/convert.py

@@ -4,6 +4,7 @@ import subprocess
 import sys
 import tempfile
 import webbrowser
+from base64 import b64encode
 from enum import Enum
 from importlib import resources
 from pathlib import Path
@@ -33,6 +34,29 @@ from .config import PresentationConfig
 from .logger import logger
 from .present import get_scenes_presentation_config
 
+DATA_URI_FIX = r"""
+// Fix found by @t-fritsch on GitHub
+// see: https://github.com/hakimel/reveal.js/discussions/3362#discussioncomment-6651475.
+function fixBase64VideoBackground(event) {
+    // event.previousSlide, event.currentSlide, event.indexh, event.indexv
+    if (event.currentSlide.getAttribute('data-background-video')) {
+        const background = Reveal.getSlideBackground(event.indexh, event.indexv),
+            video = background.querySelector('video'),
+            sources = video.querySelectorAll('source');
+
+        sources.forEach((source, i) => {
+            const src = source.getAttribute('src');
+            if(src.match(/^data:video.*;base64$/)){
+                const nextSrc = sources[i+1]?.getAttribute('src');
+                video.setAttribute('src', `${src},${nextSrc}`);
+            }
+        });
+    }
+}
+Reveal.on( 'ready', fixBase64VideoBackground );
+Reveal.on( 'slidechanged', fixBase64VideoBackground );
+"""
+
 
 def open_with_default(file: Path) -> None:
     system = platform.system()
@@ -61,6 +85,25 @@ def validate_config_option(
     return config
 
 
+def get_file_mime_type(file: Path) -> str:
+    ext = file.suffix.lower()
+
+    if ext == ".mp4":
+        return "video/mp4"
+    else:
+        return "video/webm"
+
+
+def data_uri(file: Path) -> str:
+    """
+    Reads a video and returns the corresponding data-uri.
+    """
+    b64 = b64encode(file.read_bytes()).decode("ascii")
+    mime_type = get_file_mime_type(file)
+
+    return f"data:{mime_type};base64,{b64}"
+
+
 class Converter(BaseModel):  # type: ignore
     presentation_configs: List[PresentationConfig] = []
     assets_dir: str = "{basename}_assets"
@@ -238,6 +281,8 @@ class RevealTheme(str, Enum):
 
 
 class RevealJS(Converter):
+    # Export option: use data-uri
+    data_uri: bool = False
     # Presentation size options from RevealJS
     width: Union[Str, int] = Str("100%")
     height: Union[Str, int] = Str("100%")
@@ -326,10 +371,14 @@ class RevealJS(Converter):
         for presentation_config in self.presentation_configs:
             for slide_config in presentation_config.slides:
                 file = presentation_config.files[slide_config.start_animation]
-                file = assets_dir / file.name
 
                 logger.debug(f"Writing video section with file {file}")
 
+                if self.data_uri:
+                    file = data_uri(file)
+                else:
+                    file = assets_dir / file.name
+
                 # TODO: document this
                 # Videos are muted because, otherwise, the first slide never plays correctly.
                 # This is due to a restriction in playing audio without the user doing anything.
@@ -356,6 +405,9 @@ class RevealJS(Converter):
 
     def convert_to(self, dest: Path) -> None:
         """Converts this configuration into a RevealJS HTML presentation, saved to DEST."""
+        if self.data_uri:
+            assets_dir = Path("")  # Actually we won't care.
+        else:
             dirname = dest.parent
             basename = dest.stem
             ext = dest.suffix
@@ -376,7 +428,15 @@ class RevealJS(Converter):
             sections = "".join(self.get_sections_iter(assets_dir))
 
             revealjs_template = self.load_template()
-            content = revealjs_template.format(sections=sections, **self.dict())
+
+            if self.data_uri:
+                data_uri_fix = DATA_URI_FIX
+            else:
+                data_uri_fix = ""
+
+            content = revealjs_template.format(
+                sections=sections, data_uri_fix=data_uri_fix, **self.dict()
+            )
 
             f.write(content)
 
@@ -496,6 +556,8 @@ class PowerPoint(Converter):
             ):
                 file = presentation_config.files[slide_config.start_animation]
 
+                mime_type = get_file_mime_type(file)
+
                 if self.poster_frame_image is None:
                     poster_frame_image = save_first_image_from_video_file(file)
                 else:
@@ -509,7 +571,7 @@ class PowerPoint(Converter):
                     self.width * 9525,
                     self.height * 9525,
                     poster_frame_image=poster_frame_image,
-                    mime_type="video/mp4",
+                    mime_type=mime_type,
                 )
                 if self.auto_play_media:
                     auto_play_media(movie, loop=slide_config.is_loop())

manim_slides/data/revealjs_template.html

@@ -31,7 +31,6 @@
     <!-- <script src="index.js"></script> -->
     <script>
         Reveal.initialize({{
-
            // The "normal" size of the presentation, aspect ratio will
            // be preserved when the presentation is scaled to fit different
            // resolutions. Can be specified using percentage units.
@@ -282,9 +281,9 @@
 
            // Time before the cursor is hidden (in ms)
            hideCursorTime: {hide_cursor_time}
-
-
         }});
+
+        {data_uri_fix}
     </script>
   </body>
 

poetry.lock

@@ -263,6 +263,17 @@ python-versions = ">=3.7"
 [package.extras]
 test = ["pytest (>=6)"]
 
+[[package]]
+name = "execnet"
+version = "2.0.2"
+description = "execnet: rapid multi-Python deployment"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+testing = ["hatch", "pre-commit", "pytest", "tox"]
+
 [[package]]
 name = "executing"
 version = "1.2.0"
@@ -1172,6 +1183,37 @@ pytest = ">=4.6"
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
+[[package]]
+name = "pytest-env"
+version = "0.8.2"
+description = "py.test plugin that allows you to add environment variables."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+pytest = ">=7.3.1"
+
+[package.extras]
+test = ["coverage (>=7.2.7)", "pytest-mock (>=3.10)"]
+
+[[package]]
+name = "pytest-xdist"
+version = "3.3.1"
+description = "pytest xdist plugin for distributed testing, most importantly across multiple CPUs"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+execnet = ">=1.1"
+pytest = ">=6.2.0"
+
+[package.extras]
+psutil = ["psutil (>=3.0)"]
+setproctitle = ["setproctitle"]
+testing = ["filelock"]
+
 [[package]]
 name = "python-dateutil"
 version = "2.8.2"
@@ -1699,7 +1741,7 @@ manimgl = ["manimgl"]
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.8.1,<3.12"
-content-hash = "a5277069682f9b5fa18214ac6f2b0ab7b7b25e07d92b6adc540865dd61df6244"
+content-hash = "5aa73b904cc728d93fbef1529966bbde03aa5643814e9477da0fa4bb7026f754"
 
 [metadata.files]
 alabaster = [
@@ -2035,6 +2077,10 @@ exceptiongroup = [
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 ]
+execnet = [
+    {file = "execnet-2.0.2-py3-none-any.whl", hash = "sha256:88256416ae766bc9e8895c76a87928c0012183da3cc4fc18016e6f050e025f41"},
+    {file = "execnet-2.0.2.tar.gz", hash = "sha256:cc59bc4423742fd71ad227122eb0dd44db51efb3dc4095b45ac9a08c770096af"},
+]
 executing = [
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+    {file = "lxml-4.9.3-cp27-cp27m-win_amd64.whl", hash = "sha256:4f1026bc732b6a7f96369f7bfe1a4f2290fb34dce00d8644bc3036fb351a4ca1"},
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@@ -2274,6 +2323,7 @@ lxml = [
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+    {file = "lxml-4.9.3-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:9767e79108424fb6c3edf8f81e6730666a50feb01a328f4a016464a5893f835a"},
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@@ -2293,6 +2343,7 @@ lxml = [
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+    {file = "lxml-4.9.3-cp36-cp36m-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:e3cd95e10c2610c360154afdc2f1480aea394f4a4f1ea0a5eacce49640c9b190"},
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@@ -2302,6 +2353,7 @@ lxml = [
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@@ -2311,6 +2363,7 @@ lxml = [
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     {file = "lxml-4.9.3-pp38-pypy38_pp73-macosx_11_0_x86_64.whl", hash = "sha256:5c245b783db29c4e4fbbbfc9c5a78be496c9fea25517f90606aa1f6b2b3d5f7b"},
     {file = "lxml-4.9.3-pp38-pypy38_pp73-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_24_i686.whl", hash = "sha256:4fb960a632a49f2f089d522f70496640fdf1218f1243889da3822e0a9f5f3ba7"},
+    {file = "lxml-4.9.3-pp38-pypy38_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:50670615eaf97227d5dc60de2dc99fb134a7130d310d783314e7724bf163f75d"},
     {file = "lxml-4.9.3-pp38-pypy38_pp73-manylinux_2_28_x86_64.whl", hash = "sha256:9719fe17307a9e814580af1f5c6e05ca593b12fb7e44fe62450a5384dbf61b4b"},
     {file = "lxml-4.9.3-pp38-pypy38_pp73-win_amd64.whl", hash = "sha256:3331bece23c9ee066e0fb3f96c61322b9e0f54d775fccefff4c38ca488de283a"},
     {file = "lxml-4.9.3-pp39-pypy39_pp73-macosx_11_0_x86_64.whl", hash = "sha256:ed667f49b11360951e201453fc3967344d0d0263aa415e1619e85ae7fd17b4e0"},
     {file = "lxml-4.9.3-pp39-pypy39_pp73-manylinux_2_12_i686.manylinux2010_i686.manylinux_2_24_i686.whl", hash = "sha256:8b77946fd508cbf0fccd8e400a7f71d4ac0e1595812e66025bac475a8e811694"},
+    {file = "lxml-4.9.3-pp39-pypy39_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:e4da8ca0c0c0aea88fd46be8e44bd49716772358d648cce45fe387f7b92374a7"},
     {file = "lxml-4.9.3-pp39-pypy39_pp73-manylinux_2_28_x86_64.whl", hash = "sha256:fe4bda6bd4340caa6e5cf95e73f8fea5c4bfc55763dd42f1b50a94c1b4a2fbd4"},
     {file = "lxml-4.9.3-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:f3df3db1d336b9356dd3112eae5f5c2b8b377f3bc826848567f10bfddfee77e9"},
     {file = "lxml-4.9.3.tar.gz", hash = "sha256:48628bd53a426c9eb9bc066a923acaa0878d1e86129fd5359aee99285f4eed9c"},
@@ -3004,6 +3061,14 @@ pytest-cov = [
     {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
     {file = "pytest_cov-4.1.0-py3-none-any.whl", hash = "sha256:6ba70b9e97e69fcc3fb45bfeab2d0a138fb65c4d0d6a41ef33983ad114be8c3a"},
 ]
+pytest-env = [
+    {file = "pytest_env-0.8.2-py3-none-any.whl", hash = "sha256:5e533273f4d9e6a41c3a3120e0c7944aae5674fa773b329f00a5eb1f23c53a38"},
+    {file = "pytest_env-0.8.2.tar.gz", hash = "sha256:baed9b3b6bae77bd75b9238e0ed1ee6903a42806ae9d6aeffb8754cd5584d4ff"},
+]
+pytest-xdist = [
+    {file = "pytest-xdist-3.3.1.tar.gz", hash = "sha256:d5ee0520eb1b7bcca50a60a518ab7a7707992812c578198f8b44fdfac78e8c93"},
+    {file = "pytest_xdist-3.3.1-py3-none-any.whl", hash = "sha256:ff9daa7793569e6a68544850fd3927cd257cc03a7ef76c95e86915355e82b5f2"},
+]
 python-dateutil = [
     {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
     {file = "python_dateutil-2.8.2-py2.py3-none-any.whl", hash = "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"},

pyproject.toml

@@ -90,6 +90,8 @@ manim = "^0.17.3"
 manimgl = "^1.6.1"
 pytest = "^7.4.0"
 pytest-cov = "^4.1.0"
+pytest-env = "^0.8.2"
+pytest-xdist = "^3.3.1"
 
 [tool.poetry.plugins]
 
@@ -97,6 +99,9 @@ pytest-cov = "^4.1.0"
 manim-slides = "manim_slides.__main__:cli"
 
 [tool.pytest.ini_options]
+env = [
+  "QT_QPA_PLATFORM=offscreen"
+]
 filterwarnings = [
   "error",
   "ignore::DeprecationWarning"