> On Mar 6, 2021, at 11:22 AM, Steven Kan <ste...@kan.org> wrote: > >> On Mar 5, 2021, at 2:00 PM, Michael Koch <astroelectro...@t-online.de> wrote: >> >> Am 05.03.2021 um 20:33 schrieb Steven Kan: >>>>>> I’d like to assemble these videos, side-by-side, but synced in time, >>>>>> which >>>>>> means the TrailDown video needs to start 50 seconds after the TrailUp >>>>>> video. >> >> try this command line: >> >> ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex >> "[0]tpad=start_duration=50[a];[a][1]hstack” out.mp4 > > Thank you! That worked perfectly, and now that I understand the syntax, this > works as well (to pad the end of the second track by 15 sec: > > ffmpeg -i Input1.mp4 -i Input2 -filter_complex > "[0]tpad=start_duration=50[a];[1]tpad=stop_duration=15[b];[a][b]hstack” > Out.mp4
More on this! tpad=start_duration works to delay the start of one video, but now I need to fix the audio sync. For example this command: ffmpeg -i TrailDown.mp4 -i TrailUp.mp4 -filter_complex "[0]tpad=start_duration=2.5[a];[a][1]hstack" -vcodec libx264 Coyote2Up.mp4 results in this video: https://www.youtube.com/watch?v=_PDPONEU3YA#t=35s Only the left half (TrailDown) camera has a microphone, and it’s apparent that the audio sync is off by the same 2.5 seconds that I’ve delayed its video. You can hear the female coyote (with the stumpy tail) scratching the ground 2.5 seconds before she actually does it. What flag should I add to also delay its audio? Thanks! ffmpeg -i /Users/steven/Downloads/Record/DownLoad/TrailDown.mp4 -i /Users/steven/Downloads/Record/DownLoad/TrailUp.mp4 -filter_complex "[0]tpad=start_duration=2.5[a];[a][1]hstack" -vcodec libx264 Coyote2Up.mp4 ffmpeg version N-100466-g29cef1bcd6-tessus https://evermeet.cx/ffmpeg/ Copyright (c) 2000-2020 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay libavutil 56. 62.100 / 56. 62.100 libavcodec 58.115.102 / 58.115.102 libavformat 58. 65.100 / 58. 65.100 libavdevice 58. 11.103 / 58. 11.103 libavfilter 7. 94.100 / 7. 94.100 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/steven/Downloads/Record/DownLoad/TrailDown.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 2021-03-17T17:23:18.000000Z Duration: 00:00:46.15, start: 0.000000, bitrate: 6339 kb/s Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 2592x1944, 6321 kb/s, 20 fps, 20 tbr, 1k tbn, 2k tbc (default) Metadata: creation_time : 2021-03-17T17:23:18.000000Z handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 15 kb/s (default) Metadata: creation_time : 2021-03-17T17:23:18.000000Z handler_name : SoundHandler vendor_id : [0][0][0][0] Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/steven/Downloads/Record/DownLoad/TrailUp.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 creation_time : 2021-03-17T17:22:48.000000Z encoder : Lavf58.45.100 Duration: 00:00:50.20, start: 0.000000, bitrate: 6292 kb/s Stream #1:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 2592x1944, 6291 kb/s, 20 fps, 20 tbr, 16k tbn, 32k tbc (default) Metadata: creation_time : 2021-03-17T17:22:48.000000Z handler_name : VideoHandler vendor_id : [0][0][0][0] File 'Coyote2Up.mp4' already exists. Overwrite? [y/N] y Stream mapping: Stream #0:0 (h264) -> tpad (graph 0) Stream #1:0 (h264) -> hstack:input1 (graph 0) hstack (graph 0) -> Stream #0:0 (libx264) Stream #0:1 -> #0:1 (aac (native) -> aac (native)) Press [q] to stop, [?] for help [aac @ 0x7fe8b501b600] Too many bits 8832.000000 > 6144 per frame requested, clamping to max [libx264 @ 0x7fe8b5011c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 0x7fe8b5011c00] profile High, level 6.0, 4:2:0, 8-bit [libx264 @ 0x7fe8b5011c00] 264 - core 161 r3027 4121277 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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=12 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=2 keyint=250 keyint_min=20 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 'Coyote2Up.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.65.100 Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(progressive), 5184x1944, q=2-31, 20 fps, 10240 tbn (default) Metadata: encoder : Lavc58.115.102 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s (default) Metadata: creation_time : 2021-03-17T17:23:18.000000Z handler_name : SoundHandler vendor_id : [0][0][0][0] encoder : Lavc58.115.102 aac frame= 1004 fps=7.0 q=-1.0 Lsize= 77280kB time=00:00:50.05 bitrate=12649.0kbits/s speed=0.351x video:77094kB audio:167kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.025656% [libx264 @ 0x7fe8b5011c00] frame I:5 Avg QP:17.47 size:1543698 [libx264 @ 0x7fe8b5011c00] frame P:468 Avg QP:19.13 size:140654 [libx264 @ 0x7fe8b5011c00] frame B:531 Avg QP:25.71 size: 10168 [libx264 @ 0x7fe8b5011c00] consecutive B-frames: 18.5% 27.5% 16.1% 37.8% [libx264 @ 0x7fe8b5011c00] mb I I16..4: 3.3% 34.7% 62.0% [libx264 @ 0x7fe8b5011c00] mb P I16..4: 0.1% 0.5% 0.5% P16..4: 28.5% 4.7% 5.1% 0.0% 0.0% skip:60.5% [libx264 @ 0x7fe8b5011c00] mb B I16..4: 0.0% 0.1% 0.0% B16..8: 25.7% 0.5% 0.1% direct: 0.1% skip:73.4% L0:33.7% L1:65.8% BI: 0.5% [libx264 @ 0x7fe8b5011c00] 8x8 transform intra:40.7% inter:25.7% [libx264 @ 0x7fe8b5011c00] coded y,uvDC,uvAC intra: 87.6% 0.0% 0.0% inter: 7.8% 0.0% 0.0% [libx264 @ 0x7fe8b5011c00] i16 v,h,dc,p: 22% 15% 36% 27% [libx264 @ 0x7fe8b5011c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 12% 29% 6% 8% 8% 8% 8% 8% [libx264 @ 0x7fe8b5011c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 15% 12% 7% 10% 10% 9% 9% 9% [libx264 @ 0x7fe8b5011c00] i8c dc,h,v,p: 100% 0% 0% 0% [libx264 @ 0x7fe8b5011c00] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0x7fe8b5011c00] ref P L0: 86.0% 5.4% 7.5% 1.1% [libx264 @ 0x7fe8b5011c00] ref B L0: 92.9% 6.8% 0.2% [libx264 @ 0x7fe8b5011c00] ref B L1: 96.6% 3.4% [libx264 @ 0x7fe8b5011c00] kb/s:12580.63 [aac @ 0x7fe8b501b600] Qavg: 65230.441 _______________________________________________ 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".