Following up my own post. Joel Roth wrote: > Hi list, > > First of all, thanks to the ffmpeg developers and community > for this awesome software. > > I'm using a two-pass workflow, where I pipe concatenate > source files in the first pass, then trim and process the > result in a second pass. I am not changing framerates. > > Quoting from > https://video.stackexchange.com/questions/20958/ffmpeg-dropping-duplicate-frames > > FFmpeg duplicates or drops frames when the input and output framerates > differ. > > If I apply an ffmpeg command line to process a raw MTS file > from a camera, I do not get "More than 1000 frames duplicated" > warnings during processing. > > However if I combine MTS files using pipe concatenation, > e.g. > > ffmpeg -i concat:"./00000.MTS|./00001.MTS" -codec copy ./00000.mp4 > > then run the same command line on the mp4 result, I get > plentiful duplicate frame warnings. > > I'm using Jon Van Sickle's statically ffmpeg, to wit, > ffmpeg-git-20180216-64bit-static/ffmpeg > from https://www.johnvansickle.com/ffmpeg/ > > The command line is: > > ffmpeg -i ./00000.mp4 -to 3:31 -c:v libx264 -preset:v medium -profile:v > main -tune:v film -s:v 640x360 -c:a aac -b:a 80k -ac 2 -ar 24000 -level 3 > -strict -2 -copyts -ss 1:29 ../final/20180220-1.mp4
According to ffprobe, the frame rate of the pipe-concatenated video is double. ffprobe version N-45077-g8a8d0b319-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2007-2018 the FFmpeg developers built with gcc 6.3.0 (Debian 6.3.0-18) 20170516 configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg libavutil 56. 7.101 / 56. 7.101 libavcodec 58. 11.101 / 58. 11.101 libavformat 58. 9.100 / 58. 9.100 libavdevice 58. 1.100 / 58. 1.100 libavfilter 7. 12.100 / 7. 12.100 libswscale 5. 0.101 / 5. 0.101 libswresample 3. 0.101 / 3. 0.101 libpostproc 55. 0.100 / 55. 0.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '00000.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.9.100 Duration: 00:58:26.02, start: 0.000000, bitrate: 6903 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 6637 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s (default) Metadata: handler_name : SoundHandler Side data: audio service type: main /mnt/ba1/buenos-aires-1/20180220/raw $ ffprobe *0.MTS ffprobe version N-45077-g8a8d0b319-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2007-2018 the FFmpeg developers built with gcc 6.3.0 (Debian 6.3.0-18) 20170516 configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libfribidi --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg libavutil 56. 7.101 / 56. 7.101 libavcodec 58. 11.101 / 58. 11.101 libavformat 58. 9.100 / 58. 9.100 libavdevice 58. 1.100 / 58. 1.100 libavfilter 7. 12.100 / 7. 12.100 libswscale 5. 0.101 / 5. 0.101 libswresample 3. 0.101 / 3. 0.101 libpostproc 55. 0.100 / 55. 0.100 Input #0, mpegts, from '00000.MTS': Duration: 00:37:25.73, start: 0.800300, bitrate: 7279 kb/s Program 1 Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top first), 1440x1080 [SAR 4:3 DAR 16:9], 29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 256 kb/s -- Joel Roth _______________________________________________ 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".