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import io
from typing import cast
import av
from av.codec.context import CodecContext
from av.subtitles.codeccontext import SubtitleCodecContext
from av.subtitles.subtitle import AssSubtitle, BitmapSubtitle
from .common import TestCase, fate_suite
class TestSubtitle:
def test_movtext(self) -> None:
path = fate_suite("sub/MovText_capability_tester.mp4")
subs: list[AssSubtitle] = []
with av.open(path) as container:
for packet in container.demux():
subs.extend(cast(list[AssSubtitle], packet.decode()))
assert len(subs) == 3
sub = subs[0]
assert isinstance(sub, AssSubtitle)
assert sub.type == b"ass"
assert sub.text == b""
assert sub.ass == b"0,0,Default,,0,0,0,,- Test 1.\\N- Test 2."
assert sub.dialogue == b"- Test 1.\n- Test 2."
def test_subset(self) -> None:
path = fate_suite("sub/MovText_capability_tester.mp4")
with av.open(path) as container:
subs = container.streams.subtitles[0]
for packet in container.demux(subs):
subset = subs.decode2(packet)
if subset is not None:
assert not isinstance(subset, av.subtitles.subtitle.Subtitle)
assert isinstance(subset, av.subtitles.subtitle.SubtitleSet)
assert subset.format == 1
assert hasattr(subset, "pts")
assert subset.start_display_time == 0
assert hasattr(subset, "end_display_time")
def test_vobsub(self) -> None:
path = fate_suite("sub/vobsub.sub")
subs: list[BitmapSubtitle] = []
with av.open(path) as container:
for packet in container.demux():
subs.extend(cast(list[BitmapSubtitle], packet.decode()))
assert len(subs) == 43
sub = subs[0]
assert isinstance(sub, BitmapSubtitle)
assert sub.type == b"bitmap"
assert sub.x == 259
assert sub.y == 379
assert sub.width == 200
assert sub.height == 24
assert sub.nb_colors == 4
bms = sub.planes
assert len(bms) == 1
assert len(memoryview(bms[0])) == 4800 # type: ignore
def test_subtitle_flush(self) -> None:
path = fate_suite("sub/MovText_capability_tester.mp4")
subs: list[object] = []
with av.open(path) as container:
stream = container.streams.subtitles[0]
for packet in container.demux(stream):
subs.extend(stream.decode(packet))
subs.extend(stream.decode())
assert len(subs) == 3
def test_subtitle_header_read(self) -> None:
"""Test reading subtitle_header from a decoded subtitle stream."""
path = fate_suite("sub/MovText_capability_tester.mp4")
with av.open(path) as container:
stream = container.streams.subtitles[0]
ctx = cast(SubtitleCodecContext, stream.codec_context)
header = ctx.subtitle_header
assert header is None or isinstance(header, bytes)
def test_subtitle_header_write(self) -> None:
"""Test setting subtitle_header on encoder context."""
ctx = cast(SubtitleCodecContext, CodecContext.create("mov_text", "w"))
assert ctx.subtitle_header is None
ass_header = b"[Script Info]\nScriptType: v4.00+\n"
ctx.subtitle_header = ass_header
assert ctx.subtitle_header == ass_header
new_header = b"[Script Info]\nScriptType: v4.00\n"
ctx.subtitle_header = new_header
assert ctx.subtitle_header == new_header
ctx.subtitle_header = None
assert ctx.subtitle_header is None
class TestSubtitleEncoding(TestCase):
def test_subtitle_set_create(self) -> None:
"""Test creating SubtitleSet for encoding."""
from av.subtitles.subtitle import SubtitleSet
text = b"0,0,Default,,0,0,0,,Hello World"
subtitle = SubtitleSet.create(text=text, start=0, end=2000, pts=0)
assert subtitle.format == 1
assert subtitle.start_display_time == 0
assert subtitle.end_display_time == 2000
assert subtitle.pts == 0
assert len(subtitle) == 1
assert cast(AssSubtitle, subtitle[0]).ass == text
def test_subtitle_encode_mp4(self) -> None:
"""Test encoding subtitles to MP4 container."""
from av.subtitles.subtitle import SubtitleSet
ass_header = b"""[Script Info]
ScriptType: v4.00+
PlayResX: 640
PlayResY: 480
[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
"""
output = io.BytesIO()
with av.open(output, "w", format="mp4") as container:
# MP4 requires video for subtitles
video_stream = container.add_stream("libx264", rate=30)
video_stream.width = 640
video_stream.height = 480
video_stream.pix_fmt = "yuv420p"
sub_stream = container.add_stream("mov_text")
sub_ctx = cast(SubtitleCodecContext, sub_stream.codec_context)
sub_ctx.subtitle_header = ass_header
container.start_encoding()
frame = av.VideoFrame(640, 480, "yuv420p")
frame.pts = 0
for packet in video_stream.encode(frame):
container.mux(packet)
time_base = sub_stream.time_base
assert time_base is not None
subtitle = SubtitleSet.create(
text=b"0,0,Default,,0,0,0,,Hello World",
start=0,
end=int(2 / time_base),
pts=0,
)
packet = sub_ctx.encode_subtitle(subtitle)
packet.stream = sub_stream
container.mux(packet)
for packet in video_stream.encode():
container.mux(packet)
output.seek(0)
with av.open(output) as container:
assert len(container.streams.subtitles) == 1
def test_subtitle_encode_mkv_srt(self) -> None:
"""Test encoding SRT subtitles to MKV container."""
from av.subtitles.subtitle import SubtitleSet
minimal_header = b"[Script Info]\n"
output = io.BytesIO()
with av.open(output, "w", format="matroska") as container:
sub_stream = container.add_stream("srt")
sub_ctx = cast(SubtitleCodecContext, sub_stream.codec_context)
sub_ctx.subtitle_header = minimal_header
container.start_encoding()
time_base = sub_stream.time_base
assert time_base is not None
for text, start_sec, duration_sec in [
(b"0,0,Default,,0,0,0,,First subtitle", 0, 2),
(b"0,0,Default,,0,0,0,,Second subtitle", 2, 2),
(b"0,0,Default,,0,0,0,,Third subtitle", 4, 2),
]:
subtitle = SubtitleSet.create(
text=text,
start=0,
end=int(duration_sec / time_base),
pts=int(start_sec / time_base),
)
packet = sub_ctx.encode_subtitle(subtitle)
packet.stream = sub_stream
container.mux(packet)
output.seek(0)
with av.open(output, mode="r") as input_container:
assert len(input_container.streams.subtitles) == 1
subs: list[AssSubtitle] = []
for packet in input_container.demux():
subs.extend(cast(list[AssSubtitle], packet.decode()))
assert len(subs) == 3
assert b"First subtitle" in subs[0].dialogue
assert b"Second subtitle" in subs[1].dialogue
assert b"Third subtitle" in subs[2].dialogue
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