demo error: unknown encoder libx264

[Britton-Li]

And this is my conda list.

_libgcc_mutex 0.1 conda_forge https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
_openmp_mutex 4.5 2_gnu https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
blas 1.0 mkl https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
boto3 1.26.76 pypi_0 pypi
botocore 1.29.76 pypi_0 pypi
brotli 1.0.9 h166bdaf_8 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
brotli-bin 1.0.9 h166bdaf_8 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
bzip2 1.0.8 h7f98852_4 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
ca-certificates 2022.12.7 ha878542_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
certifi 2022.12.7 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
charset-normalizer 3.0.1 pypi_0 pypi
chumpy 0.70 pypi_0 pypi
click 8.1.3 pypi_0 pypi
colorama 0.4.6 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
contourpy 1.0.7 py38hfbd4bf9_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
cudatoolkit 10.2.89 h713d32c_11 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
cycler 0.11.0 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
cython 0.29.33 py38h8dc9893_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
dataclasses 0.8 pyhc8e2a94_3 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
deeplake 3.2.9 pypi_0 pypi
dill 0.3.6 pypi_0 pypi
entrypoints 0.4 pypi_0 pypi
ffmpeg 4.3 hf484d3e_0 pytorch
filterpy 1.4.5 pypi_0 pypi
fonttools 4.38.0 py38h0a891b7_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
freetype 2.12.1 hca18f0e_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
freetype-py 2.3.0 pypi_0 pypi
fvcore 0.1.5.post20221221 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gmp 6.2.1 h58526e2_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
gnutls 3.6.13 h85f3911_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
hub 3.0.1 pypi_0 pypi
humbug 0.2.8 pypi_0 pypi
idna 3.4 pypi_0 pypi
imageio 2.25.1 pypi_0 pypi
importlib-metadata 6.0.0 pypi_0 pypi
importlib-resources 5.10.2 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
importlib_resources 5.10.2 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
intel-openmp 2021.4.0 h06a4308_3561 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
iopath 0.1.9 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
jinja2 3.1.2 pypi_0 pypi
jmespath 1.0.1 pypi_0 pypi
joblib 1.2.0 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
jpeg 9b h024ee3a_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
json-tricks 3.16.1 pypi_0 pypi
kiwisolver 1.4.4 py38h43d8883_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
lame 3.100 h166bdaf_1003 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
ld_impl_linux-64 2.40 h41732ed_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libbrotlicommon 1.0.9 h166bdaf_8 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libbrotlidec 1.0.9 h166bdaf_8 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libbrotlienc 1.0.9 h166bdaf_8 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libffi 3.4.2 h7f98852_5 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libgcc-ng 12.2.0 h65d4601_19 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libgomp 12.2.0 h65d4601_19 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libiconv 1.17 h166bdaf_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libnsl 2.0.0 h7f98852_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libpng 1.6.39 h753d276_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libsqlite 3.40.0 h753d276_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libstdcxx-ng 12.2.0 h46fd767_19 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libtiff 4.2.0 h85742a9_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libuuid 2.32.1 h7f98852_1000 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libuv 1.44.2 h166bdaf_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libwebp-base 1.2.4 h166bdaf_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
libzlib 1.2.13 h166bdaf_4 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
llvmlite 0.39.1 pypi_0 pypi
lz4-c 1.9.3 h9c3ff4c_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
markupsafe 2.1.2 pypi_0 pypi
matplotlib-base 3.7.0 py38hd6c3c57_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
mkl 2021.4.0 h06a4308_640 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
mkl-service 2.4.0 py38h95df7f1_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
mkl_fft 1.3.1 py38h8666266_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
mkl_random 1.2.2 py38h1abd341_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
multi-person-tracker 0.1 pypi_0 pypi
multiprocess 0.70.14 pypi_0 pypi
munkres 1.1.4 pyh9f0ad1d_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
ncurses 6.3 h27087fc_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
nettle 3.6 he412f7d_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
networkx 3.0 pypi_0 pypi
neural-renderer-pytorch 1.1.3 pypi_0 pypi
ninja 1.11.0 h924138e_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
numba 0.56.4 pypi_0 pypi
numcodecs 0.11.0 pypi_0 pypi
numpy 1.23.5 py38h14f4228_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
numpy-base 1.23.5 py38h31eccc5_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
olefile 0.46 pyh9f0ad1d_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
opencv-python 4.7.0.68 pypi_0 pypi
openh264 2.1.1 h780b84a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
openssl 3.0.8 h0b41bf4_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
packaging 23.0 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pathos 0.3.0 pypi_0 pypi
pillow 9.4.0 pypi_0 pypi
pip 23.0 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
portalocker 2.7.0 py38h578d9bd_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pox 0.3.2 pypi_0 pypi
ppft 1.7.6.6 pypi_0 pypi
protobuf 3.20.3 pypi_0 pypi
pycocotools 2.0.6 py38h26c90d9_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pyglet 2.0.4 pypi_0 pypi
pyjwt 2.6.0 pypi_0 pypi
pyopengl 3.1.0 pypi_0 pypi
pyparsing 3.0.9 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pyrender 0.1.45 pypi_0 pypi
python 3.8.16 he550d4f_1_cpython https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
python-dateutil 2.8.2 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
python_abi 3.8 3_cp38 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
pytorch 1.9.0 py3.8_cuda10.2_cudnn7.6.5_0 pytorch
pytorch3d 0.7.2 py38_cu102_pyt190 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch3d
pywavelets 1.4.1 pypi_0 pypi
pyyaml 6.0 py38h0a891b7_5 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
readline 8.1.2 h0f457ee_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
render 1.0.0 pypi_0 pypi
requests 2.28.2 pypi_0 pypi
s3transfer 0.6.0 pypi_0 pypi
scikit-image 0.18.3 pypi_0 pypi
scipy 1.2.2 pypi_0 pypi
setuptools 67.3.2 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
six 1.16.0 pyh6c4a22f_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
smplx 0.1.28 pypi_0 pypi
tabulate 0.9.0 pyhd8ed1ab_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
tensorboardx 2.6 pypi_0 pypi
termcolor 2.2.0 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
tifffile 2023.2.3 pypi_0 pypi
tk 8.6.12 h27826a3_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
torchaudio 0.9.0 py38 pytorch
torchgeometry 0.1.2 pypi_0 pypi
torchvision 0.10.0 py38_cu102 pytorch
tqdm 4.64.1 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
trimesh 3.20.0 pypi_0 pypi
typing_extensions 4.4.0 pyha770c72_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
unicodedata2 15.0.0 py38h0a891b7_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
urllib3 1.26.14 pypi_0 pypi
wheel 0.38.4 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
xz 5.2.6 h166bdaf_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
yacs 0.1.8 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
yaml 0.2.5 h7f98852_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
yolov3 0.1 pypi_0 pypi
zipp 3.13.0 pyhd8ed1ab_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
zlib 1.2.13 h166bdaf_4 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
zstd 1.4.9 ha95c52a_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge

[HongwenZhang]

Hi, I am sorry that I have no idea about this issue.

[mch0dmin]

hi @Britton-Li , you need to execute the following command first,

conda install -c conda-forge ffmpeg

then execute the following command,

conda install pytorch==1.9.0 torchvision==0.10.0 cudatoolkit=11.1 -c pytorch -c conda-forge