<div dir="ltr"><div><div>Hi! </div>I use gstreamer 1.8.2 to grab video from uvc camera to mp4 file. </div>Pipeline looks like: <div> gst-launch-1.0 -qe \ v4l2src device=/dev/video0 do-timestamp=true ! video/x-raw,width=640,height=480,framerate=30/1 \ ! videoconvert \ ! omxh264enc target-bitrate=524288 control-rate=variable ! video/x-h264,profile=baseline \ ! h264parse \ ! mp4mux \ ! filesink location=video.mp4 </div><div>But I need to split this pipeline into three parts using fdsink and fdsrc elements like this: </div><div><div><div> gst-launch-1.0 -qe \ v4l2src device=/dev/video0 do-timestamp=true ! video/x-raw,width=640,height=480,framerate=30/1 \ ! videoconvert \ ! omxh264enc target-bitrate=524288 control-rate=variable ! video/x-h264,profile=baseline \ ! h264parse config-interval=1 \ ! mpegtsmux \ ! fdsink \ | gst-launch-1.0 -qe \ fdsrc \ ! tsparse \ ! tsdemux \ ! h264parse \ ! mp4mux \ ! filesink location=video.mp4 </div><div>In this case mp4 file is not playable. It contains packets with correct pts value, but dts value is zero for all packets. ffprobe -show_packets video.mp4 | grep "\[PACKET\]\|pts=\|dts=" | head -n 48 ffprobe version 2.8.6 Copyright (c) 2007-2016 the FFmpeg developers built with gcc 4.9.3 (Gentoo 4.9.3 p1.5, pie-0.6.4) configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-O2 -pipe' --disable-static --enable-avfilter --enable-avresample --disable-stripping --disable-indev=v4l2 --disable-outdev=v4l2 --disable-indev=oss --disable-indev=jack --disable-outdev=oss --disable-outdev=sdl --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-doc --disable-gnutls --enable-gpl --enable-hardcoded-tables --enable-iconv --disable-lzma --enable-network --disable-openssl --enable-postproc --disable-libsmbclient --disable-ffplay --disable-sdl --enable-vaapi --disable-vdpau --disable-xlib --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --enable-opengl --disable-libv4l2 --disable-libpulse --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libfdk-aac --disable-libopenjpeg --disable-libbluray --disable-libcelt --disable-libgme --disable-libgsm --disable-libmodplug --disable-libopus --disable-libquvi --disable-librtmp --disable-libssh --disable-libschroedinger --disable-libspeex --disable-libvorbis --disable-libvpx --disable-libzvbi --disable-libbs2b --disable-libflite --disable-frei0r --disable-libfribidi --disable-fontconfig --disable-ladspa --disable-libass --disable-libfreetype --disable-libsoxr --enable-pthreads --disable-libvo-aacenc --disable-libvo-amrwbenc --disable-libmp3lame --disable-libaacplus --disable-libfaac --disable-libsnappy --disable-libtheora --disable-libtwolame --disable-libwavpack --disable-libwebp --disable-libx264 --disable-libx265 --disable-libxvid --disable-x11grab --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: mp42mp41isomiso2 creation_time : 1970-01-01 01:24:58 Duration: 00:00:00.00, start: 0.000000, bitrate: N/A Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 10k tbn, 20k tbc (default) Metadata: creation_time : 1970-01-01 01:24:58 handler_name : VideoHandler [PACKET] pts=0 dts=0 [PACKET] pts=5000 dts=0 [PACKET] pts=5400 dts=0 [PACKET] pts=5881 dts=0 [PACKET] pts=6400 dts=0 [PACKET] pts=6880 dts=0 [PACKET] pts=7400 dts=0 [PACKET] pts=7880 dts=0 [PACKET] pts=8400 dts=0 [PACKET] pts=8880 dts=0 [PACKET] pts=9400 dts=0 [PACKET] pts=9880 dts=0 [PACKET] pts=10361 dts=0 [PACKET] pts=10881 dts=0 [PACKET] pts=11361 dts=0 [PACKET] pts=11881 dts=0 </div></div></div></div>