How to use h264_mediacodec (hardware accelerated codec via MediaCodec) codecs for decoding/encoding on Android?

[DexerBR]

I'm trying to use h264_mediacodec to encode/decode frames on Android, but whenever I try to open the codec context or encode a frame, I get the error below.

...
stream = output_container.add_stream(
    "h264_mediacodec",
    rate=30,
)
stream.width = width
stream.height = height
stream.pix_fmt = "yuv420p"

...
frame = av.VideoFrame.from_bytes(buffer, width, height, flip_horizontal=False, flip_vertical=True)
for packet in stream.encode(frame): # crashes here
    output_container.mux(packet)

Error:

09-25 15:06:14.679  3677  3754 I python  :   File "av/codec/context.pyx", line 448, in av.codec.context.CodecContext.decode
09-25 15:06:14.680  3677  3754 I python  :   File "av/codec/context.pyx", line 460, in av.codec.context.CodecContext.decode
09-25 15:06:14.680  3677  3754 I python  :   File "av/codec/context.pyx", line 236, in av.codec.context.CodecContext.open
09-25 15:06:14.681  3677  3754 I python  :   File "av/error.pyx", line 326, in av.error.err_check
09-25 15:06:14.681  3677  3754 I python  : av.error.ExternalError: [Errno 542398533] Generic error in an external library
09-25 15:06:14.681  3677  3754 I python  : Python for android ended.