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Lazy import av #432

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Merged
merged 1 commit into from
Mar 14, 2024
Merged

Lazy import av #432

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2 changes: 1 addition & 1 deletion fastplotlib/layouts/_frame/_toolbar.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
from fastplotlib.layouts._subplot import Subplot
from .._subplot import Subplot


class ToolBar:
Expand Down
25 changes: 13 additions & 12 deletions fastplotlib/layouts/_record_mixin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,12 +3,17 @@
from multiprocessing import Queue, Process
from time import time

try:
import av
except ImportError:
HAS_AV = False
else:
HAS_AV = True

def _get_av():
try:
import av
except ImportError:
raise ModuleNotFoundError(
"Recording to video file requires `av`:\n"
"https://github.com/PyAV-Org/PyAV"
) from None
else:
return av


class VideoWriterAV(Process):
Expand All @@ -28,6 +33,7 @@ def __init__(
super().__init__()
self.queue = queue

av = _get_av()
self.container = av.open(path, mode="w")

self.stream = self.container.add_stream(codec, rate=fps, options=options)
Expand All @@ -45,6 +51,7 @@ def __init__(
self.stream.pix_fmt = pixel_format

def run(self):
av = _get_av()
while True:
if self.queue.empty(): # no frame to write
continue
Expand Down Expand Up @@ -177,12 +184,6 @@ def record_start(

"""

if not HAS_AV:
raise ModuleNotFoundError(
"Recording to video file requires `av`:\n"
"https://github.com/PyAV-Org/PyAV"
)

if Path(path).exists():
raise FileExistsError(f"File already exists at given path: {path}")

Expand Down
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