That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. ![]() FFmpeg supports NVENC through the h264nvenc and hevcnvenc encoders. The output of ffmpeg -codecs shows: DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264v4l2m2m h264qsv ) (encoders: libx264 libx264rgb h264omx h264qsv h264v4l2m2m h264vaapi ), and the transcoding process shows: hevc 0x561e69691a00 Using auto hwaccel type vaapi with new default device. Using NVIDIA’s GPU decoder and encoder, it is also possible to pass around CUDA Tensor directly, that is decode video into CUDA tensor or encode video from CUDA tensor. Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. NVENC can be used for H.264 and HEVC encoding. TorchAudio can make use of hardware-based video decoding and encoding supported by underlying FFmpeg libraries that are linked at runtime.
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