On 9/10/22, Cecil Westerhof via ffmpeg-user <ffmpeg-user@ffmpeg.org> wrote: > I have to concatenate about 30 videos together with xfade. Because I > did not mange to find a way to do that in one command I wrote a script > that does 1 and 2 to 1-2, 3 and 4 to 3-4, 4 and 5 to 5-6, … > Then 1-2 and 3-4 to 1-4, 5-6 and 7-8 to 5-8, … > Etcetera. > > But it seems that in every iteration the audio goes out of sync with > about one second. > > Example of one of the commands: > nice -n 10 ionice -c3 time ffmpeg -y \ > -i snellerDanDeWind.mkv \ > -i deFinale.mkv \ > -vcodec libx264 \ > -crf 26 \ > -acodec libmp3lame \ > -qscale:a 9 \ > -preset veryfast \ > -filter_complex > 'xfade=transition=slidedown:duration=4:offset=126.083000;acrossfade=d=4' > \
Offset should be first video duration minus xfade duration. Assuming that audio is not longer than video. > snellerDanDeWind-deFinale.mkv > > What am I doing wrong? > > The first part of the log for this command: > ffmpeg version 4.3.4-0+deb11u1 Copyright (c) 2000-2021 the FFmpeg > developers > built with gcc 10 (Debian 10.2.1-6) > configuration: --prefix=/usr --extra-version=0+deb11u1 > --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu > --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl > --disable-stripping --enable-avresample --disable-filter=resample > --enable-gnutls --enable-ladspa --enable-libaom --enable-libass > --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio > --enable-libcodec2 --enable-libdav1d --enable-libflite > --enable-libfontconfig --enable-libfreetype --enable-libfribidi > --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame > --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus > --enable-libpulse --enable-librabbitmq --enable-librsvg > --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr > --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora > --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx > --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 > --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx > --enable-openal --enable-opencl --enable-opengl --enable-sdl2 > --enable-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm > --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 > --enable-shared > 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, matroska,webm, from 'snellerDanDeWind.mkv': > Metadata: > ENCODER : Lavf58.45.100 > Duration: 00:02:10.08, start: 0.000000, bitrate: 4829 kb/s > Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 > [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default) > Metadata: > ENCODER : Lavc58.91.100 libx264 > DURATION : 00:02:10.083000000 > Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp (default) > Metadata: > ENCODER : Lavc58.91.100 libvorbis > DURATION : 00:02:10.003000000 > Input #1, matroska,webm, from 'deFinale.mkv': > Metadata: > ENCODER : Lavf58.45.100 > Duration: 00:12:10.44, start: 0.000000, bitrate: 3210 kb/s > Stream #1:0: Video: h264 (High), yuv420p(progressive), 1920x1080 > [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default) > Metadata: > ENCODER : Lavc58.91.100 libx264 > DURATION : 00:12:10.443000000 > Stream #1:1: Audio: vorbis, 48000 Hz, stereo, fltp (default) > Metadata: > ENCODER : Lavc58.91.100 libvorbis > DURATION : 00:12:10.003000000 > Stream mapping: > Stream #0:0 (h264) -> xfade:main > Stream #0:1 (vorbis) -> acrossfade:crossfade0 > Stream #1:0 (h264) -> xfade:xfade > Stream #1:1 (vorbis) -> acrossfade:crossfade1 > xfade -> Stream #0:0 (libx264) > acrossfade -> Stream #0:1 (libmp3lame) > Press [q] to stop, [?] for help > [libx264 @ 0x55f112f35200] using SAR=1/1 > [libx264 @ 0x55f112f35200] using cpu capabilities: MMX2 SSE2Fast SSSE3 > SSE4.2 AVX XOP FMA3 BMI1 > [libx264 @ 0x55f112f35200] profile High 4:4:4 Predictive, level 4.0, > 4:4:4, 8-bit > [libx264 @ 0x55f112f35200] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 > AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - > options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 > psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 > cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=6 threads=6 > lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 > bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 > direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 > intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=26.0 qcomp=0.60 qpmin=0 > qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 > Output #0, matroska, to 'snellerDanDeWind-deFinale.mkv': > Metadata: > encoder : Lavf58.45.100 > Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), > yuv444p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 1k tbn, > 25 tbc (default) > Metadata: > encoder : Lavc58.91.100 libx264 > Side data: > cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A > Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 48000 > Hz, stereo, fltp (default) > Metadata: > encoder : Lavc58.91.100 libmp3lame > > > -- > Cecil Westerhof > Senior Software Engineer > LinkedIn: http://www.linkedin.com/in/cecilwesterhof > _______________________________________________ > 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". > _______________________________________________ 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".