00_video_decode and 01_video_encod

For the 00_video_decode and 01_video_encod, is it hardware or software decoding? How many ways it used for hardware decoding? What kind of formats it supports?

Hi sirius850120, the samples are using the dedicated hardware codecs for encoding and decoding. Those samples in particular support H.264/H.265 formats in YUV. Please consult the Jetson TX2 Module Data Sheet for the full list of codecs supported by the hw encoder and decoder, including H.264, H.265, VP8, VP9, JPEG, (and MPEG decode).

For further documentation on those samples, please refer to the Multimedia API Reference.
You may also find further format conversions available through the L4T GStreamer Accelerate User Guide.