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ffmpegを使用して720x720ビデオ（previd.mp4）を背景画像（bg.jpg）にオーバーレイしようとしています。私は、作成されたビデオの最初のフレームが、オーバーレイビデオがその上に表示される前に、フレームの背景のみを表示するという点を除いて、動作します。最初のフレームにffmpegオーバーレイが表示されない
ffmpeg -loop 1 -i bg.jpg -i previd.mp4 -filter_complex "[1:v]scale=-1:1080[a]; [0:v][a]overlay=(main_w/2)-(overlay_w/2):0:shortest=1[video]" -map "[video]" -map 1:a -codec:a copy vid.mp4
ffmpeg version 3.0.2-tessus Copyright (c) 2000-2016 the FFmpeg developers
built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --as=yasm --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
libavutil 55. 17.103/55. 17.103
libavcodec 57. 24.102/57. 24.102
libavformat 57. 25.100/57. 25.100
libavdevice 57. 0.101/57. 0.101
libavfilter 6. 31.100/6. 31.100
libswscale 4. 0.100/4. 0.100
libswresample 2. 0.101/2. 0.101
libpostproc 54. 0.100/54. 0.100
[mjpeg @ 0x7fa934808600] Changing bps to 8
Input #0, image2, from 'bg.jpg':
Duration: 00:00:00.04, start: 0.000000, bitrate: 16835 kb/s
Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'previd_2_0.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.25.100
Duration: 00:00:06.57, start: 0.023220, bitrate: 1395 kb/s
Stream #1:0(und): Video: h264 (High) (avc1/0x31637661), yuv420p, 720x720, 1261 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #1:1(und): Audio: aac (LC) (mp4a/0x6134706D), 44100 Hz, stereo, fltp, 131 kb/s (default)
Metadata:
handler_name : SoundHandler
[swscaler @ 0x7fa93400b000] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x7fa934001200] using SAR=1/1
[libx264 @ 0x7fa934001200] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fa934001200] profile High, level 4.0
[libx264 @ 0x7fa934001200] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=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 'vid0.mp4':
Metadata:
encoder : Lavf57.25.100
Stream #0:0: Video: h264 (libx264) ([33][0][0][0]/0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
Metadata:
encoder : Lavc57.24.102 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1(und): Audio: aac (LC) ([64][0][0][0]/0x0040), 44100 Hz, stereo, 131 kb/s (default)
Metadata:
handler_name : SoundHandler
Stream mapping:
Stream #0:0 (mjpeg) -> overlay:main
Stream #1:0 (h264) -> scale
overlay -> Stream #0:0 (libx264)
Stream #1:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 26 fps=0.0 q=0.0 size= 0kB time=00:00:01.32 bitrate= 0.3kbits/sframe= 49 fps= 48 q=0.0 size= 0kB time=00:00:02.20 bitrate= 0.2kbits/sframe= 69 fps= 45 q=28.0 size= 146kB time=00:00:03.01 bitrate= 396.3kbits/frame= 92 fps= 45 q=28.0 size= 315kB time=00:00:03.94 bitrate= 654.7kbits/frame= 115 fps= 45 q=28.0 size= 514kB time=00:00:04.87 bitrate= 863.3kbits/frame= 137 fps= 45 q=28.0 size= 677kB time=00:00:05.73 bitrate= 966.9kbits/frame= 155 fps= 43 q=28.0 size= 831kB time=00:00:06.50 bitrate=1046.8kbits/frame= 164 fps= 34 q=-1.0 Lsize= 1812kB time=00:00:06.57 bitrate=2259.0kbits/s speed=1.35x
video:1700kB audio:106kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.344859%
[libx264 @ 0x7fa934001200] frame I:1 Avg QP:20.13 size: 36046
[libx264 @ 0x7fa934001200] frame P:91 Avg QP:24.37 size: 15003
[libx264 @ 0x7fa934001200] frame B:72 Avg QP:24.43 size: 4709
[libx264 @ 0x7fa934001200] consecutive B-frames: 38.4% 8.5% 1.8% 51.2%
[libx264 @ 0x7fa934001200] mb I I16..4: 30.2% 67.1% 2.7%
[libx264 @ 0x7fa934001200] mb P I16..4: 8.6% 17.6% 0.8% P16..4: 16.6% 3.1% 0.9% 0.0% 0.0% skip:52.3%
[libx264 @ 0x7fa934001200] mb B I16..4: 0.7% 1.3% 0.1% B16..8: 21.3% 1.2% 0.1% direct: 0.7% skip:74.7% L0:44.5% L1:54.2% BI: 1.4%
[libx264 @ 0x7fa934001200] 8x8 transform intra:65.0% inter:93.5%
[libx264 @ 0x7fa934001200] coded y,uvDC,uvAC intra: 32.3% 45.6% 4.6% inter: 4.3% 8.5% 0.0%
[libx264 @ 0x7fa934001200] i16 v,h,dc,p: 30% 30% 5% 35%
[libx264 @ 0x7fa934001200] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 25% 14% 4% 5% 5% 5% 5% 4%
[libx264 @ 0x7fa934001200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 27% 11% 3% 7% 5% 5% 3% 2%
[libx264 @ 0x7fa934001200] i8c dc,h,v,p: 52% 20% 22% 6%
[libx264 @ 0x7fa934001200] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fa934001200] ref P L0: 74.9% 8.3% 12.6% 4.2%
[libx264 @ 0x7fa934001200] ref B L0: 92.4% 6.8% 0.9%
[libx264 @ 0x7fa934001200] ref B L1: 97.5% 2.5%
[libx264 @ 0x7fa934001200] kb/s:2122.37
を試してみてください、あなたの 'ffmpeg'コマンドからの完全なコンソール出力を表示してください。 – LordNeckbeard
コンソール出力：http://pastebin.com/DP7mW94W –