hello:
I want to splice four or more video into one video，i want to set the
background to a fixed size and the color is black, so i must scale the image
then overlay.
My environment is ubuntu and I used command is:
ffmpeg -i h1.mp4 -i h2.mp4 -i h3.mp4 -i h4.mp4 -filter_complex
"color=c=black:s=1920x1080[bg];[0:v]scale=iw/2:-1[img0];[1:v]scale=iw/2:-1[img1];[2:v]
scale=iw/2:-1[img2];[3:v]scale=iw/2:-1[img3];[bg][img0]overlay=shortest=1[out0];[out0][img1]overlay=shortest=1:x=w[out1];[out1][img2]overlay=shortest=1:y=h[out2];[out2][img3]overlay=shortest=1:x=w:y=h"
-y out.mp4
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
the comman is correct,but when i change it to qsv. It's not working correctly:
./ffmpeg -hwaccel qsv -c:v h264_qsv -i h1.mp4 -hwaccel qsv -c:v h264_qsv -i
h2.mp4 -hwaccel qsv -c:v h264_qsv -i h3.mp4 -hwaccel qsv -c:v h264_qsv -i
h4.mp4 -filter_complex "color=black:r=30:size=1920x1080:sar=1/1,
hwupload=extra_hw_frames=64,format=qsv[bg];[0:v]scale_qsv=iw/2:ih/2[img0];[1:v]scale_qsv=iw/2:ih/2[img1];[2:v]
scale_qsv=iw/2:ih/2[img2];[3:v]scale_qsv=iw/2:ih/2[img3];[bg][img0]overlay_qsv=shortest=1[out0];[out0][img1]overlay_qsv=shortest=1:x=w[out1];[out1][img2]overlay_qsv=shortest=1:y=h[out2];[out2][img3]overlay_qsv=shortest=1:x=w:y=h"
-y out.mp4
output:
[hwupload @ 0x5593003e07c0] A hardware device reference is required to upload
frames to.
[Parsed_hwupload_1 @ 0x5593003e0680] Query format failed for
'Parsed_hwupload_1': Invalid argument
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #3:0
Conversion failed!
----------------------------------------------------------------------------------------------------------------------------------------------------------------
./ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -hwaccel qsv -c:v h264_qsv
-i h1.mp4 -hwaccel qsv -c:v h264_qsv -i h2.mp4 -hwaccel qsv -c:v h264_qsv -i
h3.mp4 -hwaccel qsv -c:v h264_qsv -i h4.mp4 -filter_complex
"color=black:r=30:size=1920x1080:sar=1/1,
hwupload=extra_hw_frames=64,format=qsv[bg];[0:v]scale_qsv=iw/2:ih/2[img0];[1:v]scale_qsv=iw/2:ih/2[img1];[2:v]
scale_qsv=iw/2:ih/2[img2];[3:v]scale_qsv=iw/2:ih/2[img3];[bg][img0]overlay_qsv=shortest=1[out0];[out0][img1]overlay_qsv=shortest=1:x=w[out1];[out1][img2]overlay_qsv=shortest=1:y=h[out2];[out2][img3]overlay_qsv=shortest=1:x=w:y=h"
-y out.mp4
output:
[Parsed_overlay_qsv_7 @ 0x563881a99180] Inputs with different underlying QSV
devices are forbidden.
[Parsed_overlay_qsv_7 @ 0x563881a99180] Failed to configure output pad on
Parsed_overlay_qsv_7
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #3:0
Conversion failed!
----------------------------------------------------------------------------------------------------------------------------------------------------------------
I want to know How can I modify my command to run correctly. Thank you.
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