Hi! I am not an expert at all in ffmpeg, but I use it to cut videos into frames for scientific investigation of fluid flows. I want to get every image (Windows shows me the video has 29 fps). However I seem to drop frames. My code is as follows:
ffmpeg -i D_CIMG7477.MOV -r 29 -f image2 D_CIMG7477-%3d.png the answer is for example: ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth -- enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug - -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable -libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enab le-zlib libavutil 55. 76.100 / 55. 76.100 libavcodec 57.106.101 / 57.106.101 libavformat 57. 82.101 / 57. 82.101 libavdevice 57. 8.101 / 57. 8.101 libavfilter 6.105.100 / 6.105.100 libswscale 4. 7.103 / 4. 7.103 libswresample 2. 8.100 / 2. 8.100 libpostproc 54. 6.100 / 54. 6.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D_CIMG7477.MOV': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf57.82.101 Duration: 00:01:07.94, start: 0.000000, bitrate: 14438 kb/s Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1920x1080 , 14436 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc (default) Metadata: handler_name : DataHandler Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> png (native)) Press [q] to stop, [?] for help Output #0, image2, to 'D_CIMG7477-%3d.png': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf57.82.101 Stream #0:0(eng): Video: png, rgb24, 1920x1080, q=2-31, 200 kb/s, 29 fps, 29 tbn, 29 tbc (default) Metadata: handler_name : DataHandler encoder : Lavc57.106.101 png frame= 6 fps=5.3 q=-0.0 size=N/A time=00:00:00.06 bitrate=N/A speed=0.0614x frame= 10 fps=4.7 q=-0.0 size=N/A time=00:00:00.20 bitrate=N/A speed=0.0975x frame= 12 fps=3.8 q=-0.0 size=N/A time=00:00:00.27 bitrate=N/A speed=0.088x frame= 16 fps=3.7 q=-0.0 size=N/A time=00:00:00.41 bitrate=N/A speed=0.0947x Past duration 0.614952 too large frame= 20 fps=3.9 q=-0.0 size=N/A time=00:00:00.55 bitrate=N/A speed=0.108x Past duration 0.647331 too large frame= 21 fps=3.3 q=-0.0 Lsize=N/A time=00:00:00.72 bitrate=N/A speed=0.115x [...] frame= 1961 fps=3.6 q=-0.0 size=N/A time=00:01:07.48 bitrate=N/A dup=0 drop=64 s frame= 1963 fps=3.6 q=-0.0 size=N/A time=00:01:07.55 bitrate=N/A dup=0 drop=64 s frame= 1966 fps=3.6 q=-0.0 size=N/A time=00:01:07.65 bitrate=N/A dup=0 drop=64 s frame= 1968 fps=3.6 q=-0.0 size=N/A time=00:01:07.72 bitrate=N/A dup=0 drop=64 s frame= 1971 fps=3.6 q=-0.0 size=N/A time=00:01:07.82 bitrate=N/A dup=0 drop=64 s frame= 1972 fps=3.6 q=-0.0 Lsize=N/A time=00:01:08.00 bitrate=N/A dup=0 drop=64 speed=0.125x video:5571246kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxi ng overhead: unknown Is it that I have dropped 64 frames in this case? How can I avoid it? Because the speed of the flow I analyze would be double as fast in the pictures in between I dropped the frame, which result in peaks in my curve. Best regards, Johanna _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".