Hi, I am trying to extract an image at set intervals from a video source. Later I will select one of images and will use the interval time and image number to determine the time in the video it came from.
If anybody has a better idea how to do this, feel free to stop me and push me in the right direction. My issue is that the first image time varies depending on the output fps. Eg fps=1/1 will output the first image from the 1st second of source; and so on. Fps=1/5 will output the first image from the 3rd second of the source. Fps=1/11 will output the first image from the 6th second of the source. It keeps getting further away from the start while remaining approx halfway to the point I expected. Any ideas how I force the first image to either be the first frame of the source, or the same value as the frequency? Maybe I would be better off getting it to seek to each spot; but that would get pretty long pretty quick. Full Command: ffmpeg -y -i /data/temporary/localised_20201118-961-d41yxx/2minclock.m4v -filter_complex \"[0:0]fifo[vout];[vout]fps=fps=1/11[vout1]\" -map \"[vout1]\" -s 283x159 -frames:v 60 -pix_fmt yuvj420p -c:v mjpeg /data/temporary/transcode_20201118-961-1qrmsyq/2minclocktest_%03d.jpeg"} Console output: /usr/src/app # ffmpeg -y -i /data/temporary/localised_20201118-961-d41yxx/2minclock.m4v -filter_complex "[0:0]fifo[vout];[vout]fps=fps=1/11[vout1]" -map "[vout1]" -s 283x159 -frames:v 60 -pix_fmt yuvj420p -c:v mjpeg /data/temporary/tra nscode_20201118-961-1qrmsyq/2minclocktest_%03d.jpeg ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.3.0 (Alpine 9.3.0) configuration: --disable-debug --disable-doc --disable-ffplay --enable-shared --enable-avresample --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-gpl --enable-libass --enable-fontconfig --enable-libfreetype --enable-libvidstab --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxcb --enable-libx265 --enable-libxvid --enable-libx264 --enable-nonfree --enable-openssl --enable-libfdk_aac --enable-postproc --enable-small --enable-version3 --enable-libbluray --enable-libzmq --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-libopenjpeg --enable-libkvazaar --enable-libaom --extra-libs=-lpthread --enable-libsrt --extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib libavutil 56. 51.100 / 56. 51.100 libavcodec 58. 91.100 / 58. 91.100 libavformat 58. 45.100 / 58. 45.100 libavdevice 58. 10.100 / 58. 10.100 libavfilter 7. 85.100 / 7. 85.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 7.100 / 5. 7.100 libswresample 3. 7.100 / 3. 7.100 libpostproc 55. 7.100 / 55. 7.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/temporary/localised_20201118-961-d41yxx/2minclock.m4v': Metadata: major_brand : M4V minor_version : 1 compatible_brands: M4V M4A isommp42 creation_time : 2020-11-18T12:36:47.000000Z encoder : Keynote 10.3.5 (7029.5.5) Duration: 00:02:01.20, start: 0.000000, bitrate: 1420 kb/s Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 1415 kb/s, 50 fps, 50 tbr, 50 tbn, 100 tbc (default) Metadata: creation_time : 2020-11-18T12:36:47.000000Z handler_name : Core Media Video Stream mapping: Stream #0:0 (h264) -> fifo fps -> Stream #0:0 (mjpeg) Press [q] to stop, [?] for help [swscaler @ 0x55efa99b2d80] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to '/data/temporary/transcode_20201118-961-1qrmsyq/2minclocktest_%03d.jpeg': Metadata: major_brand : M4V minor_version : 1 compatible_brands: M4V M4A isommp42 encoder : Lavf58.45.100 Stream #0:0: Video: mjpeg, yuvj420p(pc), 283x159 [SAR 848:849 DAR 16:9], q=2-31, 200 kb/s, 0.09 fps, 0.09 tbn, 0.09 tbc (default) Metadata: encoder : Lavc58.91.100 mjpeg Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A frame= 11 fps=2.1 q=1.6 Lsize=N/A time=00:02:01.00 bitrate=N/A speed=22.9x video:80kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown Thanks very much for any advice. Adam _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".