Joel Roth wrote: > 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 >
By adding the -r argument with the correct frame rate in the second pass, I avoid the duplicate frame warnings. The doubled frame rate using pipe concat appears to be a bug. cheers -- Joel Roth _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
