Hi! TL;DR: I am encoding AVFrames using h264_nvenc on my GPU-enabled computer, and now I wish to send these packets to a computer without a GPU/hardware acceleration and decode them there. How can I decode these packets and convert them to YUV420 pixel format?
-------------------------------------- After reading these examples (1 <https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_encode.c>) (2 <https://github.com/FFmpeg/FFmpeg/blob/a0ac49e38ee1d1011c394d7be67d0f08b2281526/fftools/ffmpeg_cuvid.c?fbclid=IwAR2wB0I78EFznVUupbjxIa0l7AIunxpCSHOfiVz9kMdzJ0w__MHBJH7UK3w>) I was able to encode frames using h264_nvenc using the following procedure: 1. Create h264_nvenc codec and AVCodecContext 2. Create hw_device_ctx 3. Create hw_frames_ctx, pass it into the AVCodecContext 4. Create a "sw_frame" and "hw_frame" 5. Read raw buffer data into the sw_frame, and use hw_transfer_data to transfer the sw_frame to the hw_frame 6. Encode the hw_frame The issue I'm having is that I wish to decode the hw_frame (which has AV_PIX_FMT_CUDA) into an AVFrame, and convert the pixel format to AV_PIX_FMT_YUV420P. I have found examples <https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/hw_decode.c> on how to do this if you are decoding on a GPU-enabled device using h264_cuvid. But, I can't figure out how to decode and convert to YUV a hardware-encoded packet using just software decoding (or, alternatively, another type of hardware decoding like QSV). What I've attempted so far: I've tried following the suggestions in this post <https://stackoverflow.com/questions/47049312/how-can-i-convert-an-ffmpeg-avframe-with-pixel-format-av-pix-fmt-cuda-to-a-new-a>. It seems that setting the decoder pixel format to AV_PIX_FMT_CUDA leads to a successful decode, but I can't figure out how to convert the pixel format to YUV (calling sws_scale results in a "slice parameters are invalid" error). I also see that YUV420P is a valid software pixel format for the CUDA hardware pixel format, but not sure what to do with that information. Thank you for your help! Much appreciated :) _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
