我在gstreamer截断gst启动管道的yuv输出时遇到问题。简化的例子是
gst-launch-1.0 filesrc location="$input" \
! decodebin \
! 'video/x-raw, format=I420' \
! rawvideoparse \
! filesink location="$output" buffer-mode=2
当我在一个MP4文件上运行它时,它的H.264视频为7680x3840,帧数为600帧,它给了我一个6280934400字节长的文件。算术快速位6280934400/7680/3840/600=0.3549609375。这是每像素三分之一字节多一点。
Setting pipeline to PAUSED ...
0:00:00.354592385 16438 0x555e06766b30 WARN basesrc gstbasesrc.c:3600:gst_base_src_start_complete:<filesrc0> pad not activated yet
Pipeline is PREROLLING ...
0:00:00.536788393 16438 0x7f3f90073680 WARN qtdemux qtdemux_types.c:239:qtdemux_type_get: unknown QuickTime node type uuid
0:00:00.536830878 16438 0x7f3f90073680 WARN qtdemux qtdemux.c:3237:qtdemux_parse_trex:<qtdemux0> failed to find fragment defaults for stream 1
0:00:00.536861715 16438 0x7f3f90073680 WARN qtdemux qtdemux.c:3237:qtdemux_parse_trex:<qtdemux0> failed to find fragment defaults for stream 2
Redistribute latency...
Redistribute latency...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
0:01:11.471563917 16438 0x7f3f8000d4a0 WARN libav gstavauddec.c:628:gst_ffmpegauddec_drain:<avdec_aac0> send packet failed, could not drain decoder
Got EOS from element "pipeline0".
Execution ended after 0:01:10.085660675
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
如果我跑了
ffmpeg -i $input -c:v rawvideo -pix_fmt yuv420p $output
然后我得到26542080000字节,这是7680*3840*600*1.5。
我的目标管道要比这个复杂得多(使用GLSL进行投影重映射),但我希望如果有人能修复这个微不足道的例子,它也能修复我真正的管道。
我如何才能建立一个gst启动管道,正确地将文件转换成原始视频,而不需要默默地放弃20%的工作方式?
