如何解决如何使用'overlay_cuda'，ffmpeg视频过滤器在视频上刻录字幕图像
我必须使用ffmpeg（v4.3）和硬件加速器cuda在视频上刻录字幕。我想在过滤器组合中使用“ overlay_cuda”。
这是我的命令。
./ffmpeg -init_hw_device cuda=cuda:1 -hwaccel cuda -filter_hw_device cuda -hwaccel_output_format cuda -i 2_dump.ts -filter_complex "[v:0]scale_npp=1920:1080,format=yuv420p[base_video];[base_video][s:3]overlay_cuda[resurlt_video]" -map "[resurlt_video]" -map 0:a -c:v h264_nvenc -f mpegts subtitle_test.ts
但是失败了。
这些是包含输出消息的错误。
ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
configuration: --prefix=/usr/local --pkg-config-flags=--static --extra-cflags=-I/usr/local/include --extra-ldflags='-L/usr/local/lib -L/usr/local/lib64' --extra-libs='-lm -lpthread -lc' --bindir=/usr/local/bin --enable-cross-compile --enable-pic --enable-gpl --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree --enable-cuda-nvcc --enable-cuvid --enable-nvenc --enable-libnpp --extra-cflags=-I/usr/local/cuda/include --extra-ldflags=-L/usr/local/cuda/lib64 --enable-libass --enable-static --disable-shared
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
[mpegts @ 0x4971500] start time for stream 5 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 6 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 7 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 8 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 9 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 10 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 11 is not set in estimate_timings_from_pts
[mpegts @ 0x4971500] start time for stream 12 is not set in estimate_timings_from_pts
Input #0,mpegts,from '2_dump.ts':
Duration: 00:05:09.80,start: 1.400000,bitrate: 12595 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: AMUZLAB
Stream #0:0[0x100](eng): Audio: ac3 ([129][0][0][0] / 0x0081),48000 Hz,5.1(side),fltp,384 kb/s
Stream #0:1[0x101](ind): Audio: ac3 ([129][0][0][0] / 0x0081),stereo,192 kb/s
Stream #0:2[0x102](zho): Audio: ac3 ([129][0][0][0] / 0x0081),192 kb/s
Stream #0:3[0x103](kho): Audio: ac3 ([129][0][0][0] / 0x0081),192 kb/s
Stream #0:4[0x104]: Video: h264 (High) ([27][0][0][0] / 0x001B),yuv420p(top first),1920x1080 [SAR 1:1 DAR 16:9],25 fps,50 tbr,90k tbn,50 tbc
Stream #0:5[0x105](CHI): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:6[0x106](CHS): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:7[0x107](IND): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:8[0x108](THA): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:9[0x109](MAN): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:10[0x10a](MON): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:11[0x10b](BUR): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
Stream #0:12[0x10c](ENG): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
File 'subtitle_test.ts' already exists. Overwrite? [y/N] y
Stream mapping:
Stream #0:4 (h264) -> scale_npp (graph 0)
Stream #0:8 (dvbsub) -> overlay_cuda:overlay (graph 0)
overlay_cuda (graph 0) -> Stream #0:0 (h264_nvenc)
Stream #0:0 -> #0:1 (ac3 (native) -> mp2 (native))
Stream #0:1 -> #0:2 (ac3 (native) -> mp2 (native))
Stream #0:2 -> #0:3 (ac3 (native) -> mp2 (native))
Stream #0:3 -> #0:4 (ac3 (native) -> mp2 (native))
Press [q] to stop,[?] for help
[mpegts @ 0x4971500] sub2video: using 1920x1080 canvas
Impossible to convert between the formats supported by the filter 'Parsed_scale_npp_0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:4
Conversion failed!
而且，这是使用“覆盖”，软件视频过滤器，非硬件加速器的命令行成功。
./ffmpeg -hwaccel cuda -re -i 2_dump.ts -filter_complex "[0:v:0][0:s:3]overlay[v]" -map "[v]" -map 0:a -c:v h264_nvenc -f mpegts subtitle_test.ts
如何使用ffmpeg（v4.3）和硬件加速器cuda在视频上刻录字幕图像？
谢谢。
解决方法
您可以像下面这样
ffmpeg -y -hwaccel cuvid -hwaccel_output_format cuda -i c:\outfile.mp4 -i C:\overlay.png -filter_complex "[0:v]scale_cuda=1280:720,format=cuda [base]; [1:v]format=nv12,hwupload_cuda,scale_cuda=1280:720,format=cuda [ovly1]; [base][ovly1] overlay_cuda,hwdownload,format=nv12[marked]" -map "[marked]" -vcodec h264_nvenc -map 0:1 -acodec copy testfile.mp4
尤其是，overlay_cuda仅支持以下叠加格式：
NV12,YUV420P,YUVA420P
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