我想拍摄一段视频，将其缩放到其宽度减去所添加图像的宽度，然后将该图像的宽度添加为填充并在该空间中叠加图像。我有一个有效的命令，但它非常慢。
ffmpeg -i "i.ts" -i img.png -filter_complex "[0]scale=iw-300:-2[vid],[vid]pad=iw+300:ih[padvid],[padvid][1]overlay=x=W-w:y=0" -c:v h264 -c:a copy o.ts
我使用是-c:v h264因为 pad 过滤器将 h264 视频编解码器更改为 mpeg2video，这大大降低了视频质量。
那么，是否有可能以某种方式加快速度？
不带编解码器参数的日志。
ffmpeg -i "i.ts" -i img1.png -filter_complex "[0]scale=iw-280:-2[vid],[vid]pad=iw+280:ih[padvid],[padvid][1]overlay=x=W-w:y=0" -c:a copy o.ts
ffmpeg version 4.3.1-2020-11-02-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
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
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0, mpegts, from 'i.ts':
Duration: 00:00:45.84, start: 2660.015000, bitrate: 8414 kb/s
Program 1
Stream #0:0[0x100]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 13 kb/s
Stream #0:1[0x101]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 90k tbn, 120 tbc
Stream #0:2[0x102]: Data: timed_id3 (ID3 / 0x20334449)
Input #1, png_pipe, from 'img1.png':
Duration: N/A, bitrate: N/A
Stream #1:0: Video: png, rgba(pc), 280x720 [SAR 3778:3778 DAR 7:18], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:1 (h264) -> scale
Stream #1:0 (png) -> overlay:overlay
overlay -> Stream #0:0 (mpeg2video)
Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
Output #0, mpegts, to 'o.ts':
Metadata:
encoder : Lavf58.45.100
Stream #0:0: Video: mpeg2video (Main), yuv420p, 1920x922 [SAR 1844:1845 DAR 256:123], q=2-31, 200 kb/s, 60 fps, 90k tbn, 60 tbc (default)
Metadata:
encoder : Lavc58.91.100 mpeg2video
Side data:
cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 13 kb/s
frame= 2750 fps= 54 q=31.0 Lsize= 16219kB time=00:00:45.82 bitrate=2899.6kbits/s speed=0.892x
video:14541kB audio:809kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 5.664216%
带有编解码器参数。
ffmpeg -i "i.ts" -i img1.png -filter_complex "[0]scale=iw-280:-2[vid],[vid]pad=iw+280:ih[padvid],[padvid][1]overlay=x=W-w:y=0" -c:v h264 -c:a copy o.ts
ffmpeg version 4.3.1-2020-11-02-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev3, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
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
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Input #0, mpegts, from 'i.ts':
Duration: 00:00:45.84, start: 2660.015000, bitrate: 8414 kb/s
Program 1
Stream #0:0[0x100]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 13 kb/s
Stream #0:1[0x101]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 90k tbn, 120 tbc
Stream #0:2[0x102]: Data: timed_id3 (ID3 / 0x20334449)
Input #1, png_pipe, from 'img1.png':
Duration: N/A, bitrate: N/A
Stream #1:0: Video: png, rgba(pc), 280x720 [SAR 3778:3778 DAR 7:18], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:1 (h264) -> scale
Stream #1:0 (png) -> overlay:overlay
overlay -> Stream #0:0 (libx264)
Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 00000261be2ef4c0] using SAR=1844/1845
[libx264 @ 00000261be2ef4c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 00000261be2ef4c0] profile High, level 4.2, 4:2:0, 8-bit
Output #0, mpegts, to 'o.ts':
Metadata:
encoder : Lavf58.45.100
Stream #0:0: Video: h264 (libx264), yuv420p, 1920x922 [SAR 1844:1845 DAR 256:123], q=-1--1, 60 fps, 90k tbn, 60 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: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 13 kb/s
frame= 2750 fps= 11 q=-1.0 Lsize= 9868kB time=00:00:45.82 bitrate=1764.2kbits/s speed=0.187x
video:8321kB audio:809kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.093884%
[libx264 @ 00000261be2ef4c0] frame I:11 Avg QP:20.82 size:137506
[libx264 @ 00000261be2ef4c0] frame P:760 Avg QP:23.08 size: 7233
[libx264 @ 00000261be2ef4c0] frame B:1979 Avg QP:25.13 size: 763
[libx264 @ 00000261be2ef4c0] consecutive B-frames: 0.8% 8.8% 3.2% 87.3%
[libx264 @ 00000261be2ef4c0] mb I I16..4: 13.0% 67.5% 19.5%
[libx264 @ 00000261be2ef4c0] mb P I16..4: 0.2% 1.0% 0.0% P16..4: 19.1% 3.3% 3.4% 0.0% 0.0% skip:73.0%
[libx264 @ 00000261be2ef4c0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 11.4% 0.1% 0.0% direct: 0.0% skip:88.5% L0:38.1% L1:61.5% BI: 0.4%
[libx264 @ 00000261be2ef4c0] 8x8 transform intra:74.1% inter:74.2%
[libx264 @ 00000261be2ef4c0] coded y,uvDC,uvAC intra: 35.0% 46.2% 14.0% inter: 2.0% 2.3% 0.0%
[libx264 @ 00000261be2ef4c0] i16 v,h,dc,p: 58% 20% 8% 14%
[libx264 @ 00000261be2ef4c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 9% 53% 3% 3% 3% 4% 3% 4%
[libx264 @ 00000261be2ef4c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 17% 9% 6% 8% 7% 9% 5% 8%
[libx264 @ 00000261be2ef4c0] i8c dc,h,v,p: 62% 17% 17% 3%
[libx264 @ 00000261be2ef4c0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000261be2ef4c0] ref P L0: 66.9% 9.8% 17.9% 5.3%
[libx264 @ 00000261be2ef4c0] ref B L0: 84.0% 9.9% 6.1%
[libx264 @ 00000261be2ef4c0] ref B L1: 95.9% 4.1%
[libx264 @ 00000261be2ef4c0] kb/s:1487.18
答案1
用一个x264-preset：
ffmpeg -i "i.ts" -i img1.png -filter_complex "[0]scale=iw-280:-2,pad=iw+280:ih[padvid],[padvid][1]overlay=x=W-w:y=0" -c:v libx264 -preset veryfast -c:a copy o.ts