download video from twitcasting
for example download this video
twitcastd -u "https://twitcasting.tv/ogurayui1017/movie/702488554" -o output.mp4
If you need to use a proxy, please set the environment variable HTTPS_PROXY.
The loading speed of the downloaded video will be slow. It is recommended to use ffmpeg to move the location of the metadata to the front.
for example:
ffmpeg -i <input> -c copy -movflags faststart <output>