When used alone in ffmpeg command line, SDL provide exellent live-view display with nearly no delay in video stream except for audio stream. like this.
ffmpeg -f dshow -video_size 1920x1080 -rtbufsize 2G -framerate 59.94 -i "Directshow A/V capture devices" -vcodec rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL OUT"
But when used together with other outputs, i.e., in the multiple outputs case, SDL output displayed significantly big delay, up to 5 seconds or more. for example, I tried to display the input video stream realtimely by SDL and encoding input and save it as below ffmpeg commands set. but SDL output display was delayed significantly.
ffmpeg -f dshow -video_size 1920x1080 -rtbufsize 2G -framerate 59.94 -i "Directshow A/V capture devices" \
-c:v rawvideo -pix_fmt yuv420p -window_size qcif -f sdl "SDL OUT" \
-c:v h264_qsv -preset fast -profile:v high -b:v 7500k -trellis:v P -r 30 -g 60 -c:a aac -b:a 128k -strict experimental -y -f mpegts d:\test.ts
Isn't there any way to keep SDL output display realtimely ?
how can I keep monitoring captured input video realtimely by SDL and encode & save it simultaneously ? thanks in advance.
