def mux_packet(self, packet: av.Packet) -> None:
"""Mux a packet to the appropriate output stream."""
# Check for end of segment
if packet.stream == self._input_video_stream:
if (
packet.is_keyframe
and (packet.dts - self._segment_start_dts) * packet.time_base
>= MIN_SEGMENT_DURATION
):
# Flush segment (also flushes the stub part segment)
self.flush(packet, last_part=True)
# Reinitialize
self.reset(packet.dts)
# Mux the packet
packet.stream = self._output_video_stream
self._av_output.mux(packet)
self.check_flush_part(packet)
self._part_has_keyframe |= packet.is_keyframe
elif packet.stream == self._input_audio_stream:
packet.stream = self._output_audio_stream
self._av_output.mux(packet)
def image_sequence_encode(self, codec_name):
try:
codec = Codec(codec_name, "w")
except UnknownCodecError:
raise SkipTest()
container = av.open(fate_suite("h264/interlaced_crop.mp4"))
video_stream = container.streams.video[0]
width = 640
height = 480
ctx = codec.create()
pix_fmt = ctx.codec.video_formats[0].name
ctx.width = width
ctx.height = height
ctx.time_base = video_stream.codec_context.time_base
ctx.pix_fmt = pix_fmt
ctx.open()
frame_count = 1
path_list = []
for frame in iter_frames(container, video_stream):
new_frame = frame.reformat(width, height, pix_fmt)
new_packets = ctx.encode(new_frame)
self.assertEqual(len(new_packets), 1)
new_packet = new_packets[0]
path = self.sandboxed("%s/encoder.%04d.%s" % (
codec_name,
frame_count,
codec_name if codec_name != "mjpeg" else "jpg",
))
path_list.append(path)
with open(path, "wb") as f:
f.write(new_packet)
frame_count += 1
if frame_count > 5:
break
ctx = av.Codec(codec_name, "r").create()
for path in path_list:
with open(path, "rb") as f:
size = os.fstat(f.fileno()).st_size
packet = Packet(size)
size = f.readinto(packet)
frame = ctx.decode(packet)[0]
self.assertEqual(frame.width, width)
self.assertEqual(frame.height, height)
self.assertEqual(frame.format.name, pix_fmt)
def __try_add_stream(self, sample_packet: av.Packet) -> bool:
if len(self.__output.streams.video) == 0:
if sample_packet.stream_index == 1:
self.__output.add_stream('aac')
sample_frames = sample_packet.decode()
if len(sample_frames) == 0:
return False
sample_frame = [x for x in sample_frames if isinstance(x, av.VideoFrame)][0]
self.__stream = self.__output.add_stream('libx264', '30')
self.__stream.pix_fmt = sample_frame.format.name
self.__stream.width = sample_frame.width
self.__stream.height = sample_frame.height
return True
return True
def iter_raw_frames(path, packet_sizes, ctx):
with open(path, "rb") as f:
for i, size in enumerate(packet_sizes):
packet = Packet(size)
read_size = f.readinto(packet)
assert size
assert read_size == size
if not read_size:
break
for frame in ctx.decode(packet):
yield frame
while True:
try:
frames = ctx.decode(None)
except EOFError:
break
for frame in frames:
yield frame
if not frames:
break
def iter_raw_frames(path, packet_sizes, ctx):
with open(path, 'rb') as f:
for i, size in enumerate(packet_sizes):
packet = Packet(size)
read_size = f.readinto(packet)
assert size
assert read_size == size
if not read_size:
break
for frame in ctx.decode(packet):
yield frame
while True:
try:
frames = ctx.decode(None)
except AVError as e:
if e.errno != 541478725: # EOF
raise
break
for frame in frames:
yield frame
if not frames:
break
