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FFMPEG 在发出“过去持续时间……”警报后不会停止

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FFMPEG 在发出“过去持续时间……”警报后不会停止

我正在ffmpeg给视频添加 2 个水印。

它运行良好，就像魔法一样。我只是遇到了一个小问题：除非我按下退出进程，ffmpeg否则不会停止编码。这是我的命令：CTRL+C

/usr/bin/ffmpeg  -i /home/twinuts/sd/videobot/www/in.mp4 -y /
-loop 1 -i /home/twinuts/sd/videobot/www/outro.png /
-loop 1 -i /home/twinuts/sd/videobot/www/newlayer.png /
-filter_complex "[1:v]fade=t=in:st=7:d=1:alpha=1[wm]; /
[2:v]fade=t=out:st=7:d=1:alpha=1[wm2]; /
[0:v][wm]overlay[v];[v][wm2]overlay" /
-codec:v libx264 -codec:a libfdk_aac /   
/home/twinuts/sd/videobot/www/videos/newvideo.avi

这是我的输出控制台：

    ffmpeg version git-2015-09-06-db18b3d Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
  configuration: --prefix=/usr/ffmpeg_build --extra-cflags=-I/usr/ffmpeg_build/include --extra-ldflags=-L/usr/ffmpeg_build/lib --bindir=/usr/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
  libavutil      55.  0.100 / 55.  0.100
  libavcodec     57.  0.100 / 57.  0.100
  libavformat    57.  0.100 / 57.  0.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6.  0.100 /  6.  0.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.100 /  2.  0.100
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/twinuts/sd/videobot/www/in.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.0.100
  Duration: 00:00:10.05, start: 0.046440, bitrate: 1607 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1477 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Input #1, png_pipe, from '/home/twinuts/sd/videobot/www/outro.png':
  Duration: N/A, bitrate: N/A
    Stream #1:0: Video: png, rgb24(pc), 1280x720, 25 fps, 25 tbr, 25 tbn, 25 tbc
Input #2, png_pipe, from '/home/twinuts/sd/videobot/www/newlayer.png':
  Duration: N/A, bitrate: N/A
    Stream #2:0: Video: png, rgba(pc), 1280x720, 25 fps, 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0x4afb4a0] using SAR=1/1
[libx264 @ 0x4afb4a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x4afb4a0] profile High, level 3.1
Output #0, avi, to '/home/twinuts/sd/videobot/www/videos/newvideo.avi':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    ISFT            : Lavf57.0.100
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 25 tbn, 25 tbc (default)
    Metadata:
      encoder         : Lavc57.0.100 libx264
    Stream #0:1(und): Audio: aac (libfdk_aac) ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, s16, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      encoder         : Lavc57.0.100 libfdk_aac
Stream mapping:
  Stream #0:0 (h264) -> overlay:main (graph 0)
  Stream #1:0 (png) -> fade (graph 0)
  Stream #2:0 (png) -> fade (graph 0)
  overlay (graph 0) -> Stream #0:0 (libx264)
  Stream #0:1 -> #0:1 (aac (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
Past duration 0.839836 too large    1475kB time=00:00:10.00 bitrate=1207.7kbits/s    
frame=  251 fps= 23 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=110   frame=  251 fps= 22 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=143   frame=  251 fps= 21 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=176   frame=  251 fps= 20 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=201   frame=  251 fps= 20 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=222   frame=  251 fps= 19 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=254   frame=  251 fps= 18 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=287   frame=  251 fps= 18 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=319   frame=  251 fps= 17 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=352   frame=  251 fps= 16 q=28.0 size=    1504kB time=00:00:10.00 bitrate=1230.9kbits/s dup=0 drop=385   frame=  251 fps= 16 q=-1.0 Lsize=    1580kB time=00:00:10.05 bitrate=1287.7kbits/s dup=0 drop=392    
video:1395kB audio:159kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.686170%
[libx264 @ 0x4afb4a0] frame I:2     Avg QP:18.98  size: 35646
[libx264 @ 0x4afb4a0] frame P:109   Avg QP:20.17  size:  9465
[libx264 @ 0x4afb4a0] frame B:140   Avg QP:20.37  size:  2329
[libx264 @ 0x4afb4a0] consecutive B-frames: 15.9% 23.9% 15.5% 44.6%
[libx264 @ 0x4afb4a0] mb I  I16..4: 20.7% 56.8% 22.5%
[libx264 @ 0x4afb4a0] mb P  I16..4:  9.9% 12.2%  0.4%  P16..4: 42.1%  6.4%  1.7%  0.0%  0.0%    skip:27.3%
[libx264 @ 0x4afb4a0] mb B  I16..4:  0.7%  0.5%  0.0%  B16..8: 25.7%  1.0%  0.0%  direct: 1.9%  skip:70.2%  L0:41.5% L1:56.8% BI: 1.7%
[libx264 @ 0x4afb4a0] 8x8 transform intra:53.7% inter:90.7%
[libx264 @ 0x4afb4a0] coded y,uvDC,uvAC intra: 19.7% 62.5% 15.3% inter: 5.2% 20.7% 0.1%
[libx264 @ 0x4afb4a0] i16 v,h,dc,p: 38% 23% 15% 23%
[libx264 @ 0x4afb4a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 16% 32%  2%  3%  3%  3%  2%  2%
[libx264 @ 0x4afb4a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 21% 16%  3%  6%  6%  4%  3%  2%
[libx264 @ 0x4afb4a0] i8c dc,h,v,p: 62% 16% 19%  3%
[libx264 @ 0x4afb4a0] Weighted P-Frames: Y:19.3% UV:19.3%
[libx264 @ 0x4afb4a0] ref P L0: 79.2%  7.0% 11.3%  2.3%  0.1%
[libx264 @ 0x4afb4a0] ref B L0: 91.4%  8.0%  0.6%
[libx264 @ 0x4afb4a0] ref B L1: 96.7%  3.3%
[libx264 @ 0x4afb4a0] kb/s:1138.61
[root@xxx ~]#

我猜想这与 PNG 帧速率与 mp4 不同有关（这是个大胆的猜测），但如果能提供任何指点，我将不胜感激

答案1

为什么要ffmpeg永远处理我的视频？

发生的情况是，ffmpeg到达了您的一个输入（视频）的末尾，但继续编码，因为其他输入（在本例中是您的图像，设置为）仍在继续。这会导致丢帧，直到您使用或 手动-loop 1终止：ffmpegqCtrl+C

... drop=110
... drop=143
... drop=176
... drop=201
... drop=222
... 
... drop=385
... drop=392

我如何知道ffmpeg使用最短的视频片段？

根据输入和工作流程，有两个选项。

您可以使用-shortest选项（来自ffmpeg文档)：

-shortest (output)
     Finish encoding when the shortest input stream ends.

或者使用shortest参数来overlay过滤（从过滤器文档)：

shortest
    If set to 1, force the output to terminate when the shortest input terminates. Default value is 0.

我正在使用overlay过滤器叠加两个水印......

在这种情况下，由于您正在使用filter_complex来管理输入，因此您将使用overlay该shortest选项；因此您的命令变成：

/usr/bin/ffmpeg  -i /home/twinuts/sd/videobot/www/in.mp4 -y /
-loop 1 -i /home/twinuts/sd/videobot/www/outro.png /
-loop 1 -i /home/twinuts/sd/videobot/www/newlayer.png /
-filter_complex "[1:v]fade=t=in:st=7:d=1:alpha=1[wm]; /
[2:v]fade=t=out:st=7:d=1:alpha=1[wm2]; /
[0:v][wm]overlay=shortest=1[v];[v][wm2]overlay=shortest=1" /
-codec:v libx264 -codec:a libfdk_aac /   
/home/twinuts/sd/videobot/www/videos/newvideo.avi

in.mp4完成后即终止。

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