jnrian.blogg.se - H264

Here, the x264 codec with the fastest possible encoding speed is used. $ ffmpeg -f x11grab -video_size 1920x1080 -framerate 25 -i $DISPLAY -f alsa -i default -c:v libx264 -preset ultrafast -c:a aac screen.mp4 To take a screencast screen.mp4 with lossy encoding and with audio: Here, the Huffyuv codec is used, which is fast, but produces huge file sizes. $ ffmpeg -f x11grab -video_size 1920x1080 -framerate 25 -i $DISPLAY -c:v ffvhuff screen.mkv To take a screencast screen.mkv with lossless encoding and without audio: Where -video_size specifies the size of the area to capture. $ ffmpeg -f x11grab -video_size 1920x1080 -i $DISPLAY -vframes 1 screen.png See FFmpeg encoding wiki and ffmpeg(1) § EXAMPLES.įFmpeg includes the x11grab and ALSA virtual devices that enable capturing the entire user display and audio input. However you may want to force the number of threads available by the parameter -threads number.

FFmpeg should automatically choose the number of CPU threads available.

Failing to do so may cause parameters being skipped or will prevent FFmpeg from executing.

It is important that parameters are specified in the correct order (e.g.

This guide explains ways to accelerate video encoding, decoding and end-to-end transcoding on NVIDIA GPUs through FFmpeg. Using FFmpeg with NVIDIA GPU Hardware Acceleration This guide helps developers in knowing settings used in SDK v9.1 and their equivalents in SDK v10.0 and above. This guide provides a detailed discussion of the NVENC programming interface, describes setting up hardware for encoding and provides guidance on achieving maximum performance. NVENC Video Encoder API Programming Guide This application note helps developers in knowing NVENC HW capabilities and expected encode performance of NVIDIA GPUs. This guide provides a detailed discussion of the NVDEC Decode API programming interface and provides guidance on achieving maximum performance by writing an efficient application.

NVDEC Video Decoder API Programming Guide This application note helps developers in knowing NVDEC HW capabilities and expected decode performance of NVIDIA GPUs. The End User License Agreements of NVIDIA Video Codec SDK v11.1

Release Notes of NVIDIA Video Codec SDK v11.1ĭeprecation Notices of NVIDIA Video Codec SDK v11.1