Question

正如标题所说，我对30多岁的转换视频存在问题。它们不是在Chrome中播放，但它们可以在所有其他浏览器中使用。问题是，如果视频小于30秒，那么它在Chrome中的效果也不错。

输入文件是mpeg4编码的，我正在尝试使用h264编解码器对其进行转换。转换是在一个Linux服务器上完成的，它有一个drupal模块，可以自动转换上传的视频。

这是命令和输出：

/opt/ffmpeg/ffmpeg -i '/var/www/html/website/videos/original/2016-02-02-16-52-44-758_1.mp4' -strict experimental -vcodec 'libx264' -pix_fmt 'yuv420p' -vprofile 'baseline' -an -pass '1' -passlogfile '/tmp/1454496233-56b1d9e99deb8-multipass'  -y /tmp/1454496233-56b1d9e99dd6f.mp4
ffmpeg version N-61041-g52a2138 Copyright (c) 2000-2014 the FFmpeg developers
  built on Mar  2 2014 05:45:04 with gcc 4.6 (Debian 4.6.3-1)
  configuration: --prefix=/root/ffmpeg-static/64bit --extra-cflags='-I/root/ffmpeg-static/64bit/include -static' --extra-ldflags='-L/root/ffmpeg-static/64bit/lib -static' --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static --disable-shared --disable-ffserver --disable-doc --enable-bzlib --enable-zlib --enable-postproc --enable-runtime-cpudetect --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
  libavutil      52. 66.100 / 52. 66.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/html/website/videos/original/2016-02-02-16-52-44-758_1.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf56.40.101
  Duration: 00:00:54.42, start: 0.000000, bitrate: 840 kb/s
    Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 839 kb/s, 24 fps, 24 tbr, 12288 tbn, 24 tbc (default)
    Metadata:
      handler_name    : VideoHandler
[libx264 @ 0x38799c0] using SAR=1/1
[libx264 @ 0x38799c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0x38799c0] profile Constrained Baseline, level 3.1
[libx264 @ 0x38799c0] 264 - core 129 r2230 1cffe9f - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=1:0:0 analyse=0x1:0 me=dia subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=24 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 '/tmp/1454496233-56b1d9e99dd6f.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf55.33.100
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, pass 1, 12288 tbn, 24 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg4 -> libx264)
Press [q] to stop, [?] for help
frame=  129 fps=0.0 q=28.0 size=     298kB time=00:00:03.41 bitrate= 715.2kbits/s    
frame=  268 fps=267 q=28.0 size=     784kB time=00:00:09.20 bitrate= 697.3kbits/s    
frame=  409 fps=271 q=28.0 size=    1313kB time=00:00:15.08 bitrate= 712.9kbits/s    
frame=  547 fps=272 q=28.0 size=    1744kB time=00:00:20.83 bitrate= 685.8kbits/s    
frame=  687 fps=274 q=28.0 size=    2275kB time=00:00:26.66 bitrate= 699.0kbits/s    
frame=  827 fps=275 q=28.0 size=    2754kB time=00:00:32.50 bitrate= 694.1kbits/s    
frame=  967 fps=275 q=28.0 size=    3273kB time=00:00:38.33 bitrate= 699.4kbits/s    
frame= 1106 fps=275 q=28.0 size=    3826kB time=00:00:44.12 bitrate= 710.2kbits/s    
frame= 1245 fps=276 q=28.0 size=    4366kB time=00:00:49.91 bitrate= 716.6kbits/s    
frame= 1306 fps=268 q=-1.0 Lsize=    4762kB time=00:00:54.41 bitrate= 716.8kbits/s
video:4756kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 0.125035%
[libx264 @ 0x38799c0] frame I:6     Avg QP:17.10  size: 43459
[libx264 @ 0x38799c0] frame P:1300  Avg QP:20.34  size:  3545
[libx264 @ 0x38799c0] mb I  I16..4: 31.1%  0.0% 68.9%
[libx264 @ 0x38799c0] mb P  I16..4:  3.7%  0.0%  0.0%  P16..4: 14.8%  0.0%  0.0%  0.0%  0.0%    skip:81.5%
[libx264 @ 0x38799c0] coded y,uvDC,uvAC intra: 29.2% 62.3% 14.8% inter: 3.4% 5.8% 0.4%
[libx264 @ 0x38799c0] i16 v,h,dc,p: 58% 22% 17%  2%
[libx264 @ 0x38799c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 59% 24%  8%  1%  1%  1%  2%  1%  2%
[libx264 @ 0x38799c0] i8c dc,h,v,p: 36% 14% 47%  3%
[libx264 @ 0x38799c0] kb/s:715.83

我也试过最新版本的ffmpeg，但我遇到了同样的问题。有没有人对为什么会这样做有任何想法？

请注意，这是执行双遍编码的日志（这是从drupal获取日志的唯一方法）。如果我在ffmpeg命令中指定比特率，则双通道编码有效，但正如我所说，它在chrome上不起作用，但适用于所有其他浏览器。

Answer 1

解决方案是在drupal的UI中添加qt-faststart作为帮助程序。

转到Configuration>Media>Video，展开Helper Programs并将路径设置为qt-faststart。它应该在你的ffmpeg二进制文件夹中。

Ffmpeg转换的视频（超过30秒）未播放镀铬

1 个答案: