Slice multithreading is mainly used for low latency streaming. It is probably safer to leave threading setup on libavcodec than setting up each codec threading individually.įrom what I have read so far, frame multithreading should be faster than slice multithreading. Looking at `ff_frame_thread_encoder_init()` code, these cases are not equivalent.

PCodecCtx->thread_count = BLI_system_thread_count() For longer videos you will need to use a higher number ( %08d.png).įfmpeg -i input.mp4 -pix_fmt rgba64be output_%04d.pngįfmpeg -i input.mp4 -pix_fmt rgb24 output_%04d.pngįfmpeg -i input.mp4 -pix_fmt rgb48be output_%04d.pngįfmpeg -i input.mp4 -compression_algo lzw -pix_fmt rgba output_%04d.tiffįfmpeg -i input.mp4 -compression_algo lzw -pix_fmt rgba64le output_%04d.tiffįfmpeg -i input.mp4 -compression_algo lzw -pix_fmt rgb24 output_%04d.tiffįfmpeg -i input.mp4 -compression_algo lzw -pix_fmt rgb48le output_%04d.Generalize threading settings in proxy building and use them for encoding/decoding in general.Ĭheck codec capabilities, prefer FF_THREAD_FRAME threading over FF_THREAD_SLICE and automatic thread count over setting it explicitly.įfmpeg-codecs man page suggests that `threads` option is global and used by codecs, that supports this option.įorm some tests I have done, it seems that `av_dict_set_int(&codec_opts, 'threads', BLI_system_thread_count(), 0) ` has same effect as Using the above example the output files will be called output_0001.png, output_0002.png, output_0002.png and so on. %04d specifies the position of the characters representing a sequential number in each file name matched by the pattern. Replace input.mp4 with the name of your video and output_ with the name your output image files. Use this command to extract the video to a png image sequence:įfmpeg -i input.mp4 -pix_fmt rgba output_%04d.png.Open a terminal and navigate to the folder containing the video.FFmpeg provides a convenient command-line solution for converting video to images.

Blender what is ffmpeg