Sorry if my question is dumb, but I'm new to FFmpeg.
I have some videos. They all have the same video codec, resolution and framerate. Audio streams also have the same format. For example, MP4 files, H264, AAC.
I want to merge some of them into one file with smooth transitions between them. I just want the simplest one - when videos overlaps for 2-3 seconds. The first one fades out and the second fades in.
I read the docs and some other questions and found out that I need some set of concat filter with something like blend or overlay or fade.
Please help.
Update:
ffmpeg \
-i input0.mp4 \
-i input1.mp4 \
-filter_complex \
"[0:v]setpts=PTS-STARTPTS[v0];[1:v]setpts=PTS-STARTPTS+4/TB,format=yuva444p,fade=st=4:d=1:t=in:alpha=1[v1];[v0][v1]overlay,format=yuv420p[v];[0:a]asetpts=PTS-STARTPTS[a0];[1:a]asetpts=PTS-STARTPTS[a1];[a0][a1]acrossfade=d=1[a]" \
-map "[v]" -map "[a]" output.mp4
Log:
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input0.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2019-10-20T09:15:30.000000Z
com.android.version: 8.0.0
Duration: 00:00:23.81, start: 0.000000, bitrate: 17280 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 17023 kb/s, SAR 1:1 DAR 16:9, 30.04 fps, 30 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2019-10-20T09:15:30.000000Z
handler_name : VideoHandle
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
creation_time : 2019-10-20T09:15:30.000000Z
handler_name : SoundHandle
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'input1.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2019-10-20T09:16:05.000000Z
com.android.version: 8.0.0
Duration: 00:00:28.76, start: 0.000000, bitrate: 17282 kb/s
Stream #1:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 17019 kb/s, SAR 1:1 DAR 16:9, 30.04 fps, 30 tbr, 90k tbn, 180k tbc (default)
Metadata:
creation_time : 2019-10-20T09:16:05.000000Z
handler_name : VideoHandle
Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
Metadata:
creation_time : 2019-10-20T09:16:05.000000Z
handler_name : SoundHandle
Stream mapping:
Stream #0:0 (h264) -> setpts
Stream #0:1 (aac) -> asetpts
Stream #1:0 (h264) -> setpts
Stream #1:1 (aac) -> asetpts
format -> Stream #0:0 (libx264)
acrossfade -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x55dd4a513aa0] using SAR=1/1
[libx264 @ 0x55dd4a513aa0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x55dd4a513aa0] profile High, level 4.0
[libx264 @ 0x55dd4a513aa0] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
com.android.version: 8.0.0
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
encoder : Lavc57.107.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
encoder : Lavc57.107.100 aac
Past duration 0.600319 too large 24832kB time=00:00:27.11 bitrate=7502.4kbits/s speed=0.792x
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Last message repeated 1 times
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frame= 985 fps= 13 q=-1.0 Lsize= 60323kB time=00:00:51.58 bitrate=9579.9kbits/s speed=0.695x
video:59484kB audio:810kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.048264%
[libx264 @ 0x55dd4a513aa0] frame I:5 Avg QP:22.90 size:206885
[libx264 @ 0x55dd4a513aa0] frame P:303 Avg QP:25.09 size:100886
[libx264 @ 0x55dd4a513aa0] frame B:677 Avg QP:27.85 size: 43292
[libx264 @ 0x55dd4a513aa0] consecutive B-frames: 6.3% 4.3% 5.8% 83.7%
[libx264 @ 0x55dd4a513aa0] mb I I16..4: 11.1% 49.1% 39.8%
[libx264 @ 0x55dd4a513aa0] mb P I16..4: 6.5% 14.1% 9.5% P16..4: 37.5% 16.2% 8.2% 0.0% 0.0% skip: 8.0%
[libx264 @ 0x55dd4a513aa0] mb B I16..4: 1.5% 1.6% 3.3% B16..8: 48.1% 8.4% 2.2% direct: 4.6% skip:30.3% L0:52.3% L1:34.9% BI:12.8%
[libx264 @ 0x55dd4a513aa0] 8x8 transform intra:40.2% inter:46.8%
[libx264 @ 0x55dd4a513aa0] coded y,uvDC,uvAC intra: 63.8% 25.9% 2.2% inter: 27.2% 7.1% 0.0%
[libx264 @ 0x55dd4a513aa0] i16 v,h,dc,p: 20% 25% 25% 30%
[libx264 @ 0x55dd4a513aa0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 26% 25% 4% 4% 4% 6% 3% 8%
[libx264 @ 0x55dd4a513aa0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 27% 18% 6% 6% 4% 10% 4% 13%
[libx264 @ 0x55dd4a513aa0] i8c dc,h,v,p: 73% 14% 11% 2%
[libx264 @ 0x55dd4a513aa0] Weighted P-Frames: Y:18.8% UV:5.9%
[libx264 @ 0x55dd4a513aa0] ref P L0: 67.5% 18.8% 10.3% 3.0% 0.5%
[libx264 @ 0x55dd4a513aa0] ref B L0: 96.9% 2.4% 0.7%
[libx264 @ 0x55dd4a513aa0] ref B L1: 98.4% 1.6%
[libx264 @ 0x55dd4a513aa0] kb/s:14841.31
[aac @ 0x55dd4a4b21c0] Qavg: 496.588