文件转换不可读

Question

我使用ffmpeg将一个Videohive文件从14秒缩短到5秒，命令行上有以下条目：

ffmpeg -i 15_Shopping_VKV.mov -t 5 shoes.mp4 

当我尝试使用Quicktime播放它时，该文件不起作用。与其他Google搜索一起，我查看了Stackoverflow中的以下链接，以获得建议：

https://stackoverflow.com/questions/25831944/unreadable-files
https://stackoverflow.com/questions/4818681/ffmpeg-conversion-error
https://stackoverflow.com/questions/22307229/ffmpeg-mp4-file-is-not-valid

在这一点上，我没有办法找出出了什么问题，更不用说如何解决问题了。

以下是一些其他细节：

我成功地编辑了其他几个Videohive文件，但每个文件的格式略有不同，虽然我已经转换了一些具有类似条目的其他文件，或者将编解码器调整为web就绪的文件，但我无法成功地转换这个文件。就像所有其他原始的视频蜂窝文件一样，它很容易被QuickTime读取。只有在转换之后，此文件才无法工作。我转换过的所有其他文件都使用以下转换，例如：

ffmpeg -i mainfile.mp4 -t 5:00 rave.mp4 

或

ffmpeg -i 00299.mov -c:v libx264 dating.mp4

以下是一些可能有帮助的其他细节：

( 1)指向破损文件的链接

https://s3.amazonaws.com/files.parsetfss.com/90b6030c-d712-42ec-b2ee-deb43a4dd277/tfss-79b45914-9ada-4c1c-8fbc-8d652f8c00c7-shoes.mp4

( 2) ffmpeg工艺的打印输出

News-MacBook-Air:CP08.14.15 newuser$ ffmpeg -i 15_Shopping_VKV.mov  -t 5  shoes.mov
ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-libfreetype --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libass --enable-ffplay --enable-libspeex --enable-libschroedinger --enable-libfdk-aac --enable-libopus --enable-frei0r --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags='-I/usr/local/Cellar/openjpeg/1.5.1_1/include/openjpeg-1.5 ' --enable-nonfree --enable-vda
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '15_Shopping_VKV.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    creation_time   : 2015-03-07 22:03:36
  Duration: 00:00:14.71, start: 0.000000, bitrate: 78240 kb/s
    Stream #0:0(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj422p(pc, bt470bg/bt709/bt709), 1920x1080 [SAR 72:72 DAR 16:9], 78231 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc (default)
    Metadata:
      creation_time   : 2015-03-07 22:03:36
      handler_name    : Apple Alias Data Handler
      encoder         : Photo - JPEG
      timecode        : 00:02:36;02
    Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2015-03-07 22:15:55
      handler_name    : Apple Alias Data Handler
      timecode        : 00:02:36;02
File 'shoes.mov' already exists. Overwrite ? [y/N] y
No pixel format specified, yuvj422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[libx264 @ 0x7fbc9400a000] using SAR=1/1
[libx264 @ 0x7fbc9400a000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0x7fbc9400a000] profile High 4:2:2, level 4.0, 4:2:2 8-bit
[libx264 @ 0x7fbc9400a000] 264 - core 144 r2533 c8a773e - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=6 lookahead_threads=1 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, mov, to 'shoes.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 537199360
    compatible_brands: qt  
    encoder         : Lavf56.36.100
    Stream #0:0(eng): Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
    Metadata:
      creation_time   : 2015-03-07 22:03:36
      handler_name    : Apple Alias Data Handler
      timecode        : 00:02:36;02
      encoder         : Lavc56.41.100 libx264
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame=  150 fps=6.9 q=-1.0 Lsize=    3953kB time=00:00:04.93 bitrate=6557.7kbits/s    
video:3950kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.080847%
[libx264 @ 0x7fbc9400a000] frame I:1     Avg QP:25.46  size: 71679
[libx264 @ 0x7fbc9400a000] frame P:72    Avg QP:25.36  size: 40886
[libx264 @ 0x7fbc9400a000] frame B:77    Avg QP:27.53  size: 13357
[libx264 @ 0x7fbc9400a000] consecutive B-frames:  0.7% 89.3% 10.0%  0.0%
[libx264 @ 0x7fbc9400a000] mb I  I16..4: 16.5% 80.0%  3.5%
[libx264 @ 0x7fbc9400a000] mb P  I16..4:  5.3% 14.6%  0.6%  P16..4: 41.1% 10.6%  3.0%  0.0%  0.0%    skip:24.9%
[libx264 @ 0x7fbc9400a000] mb B  I16..4:  0.4%  1.2%  0.0%  B16..8: 32.7%  4.0%  0.7%  direct: 2.8%  skip:58.2%  L0:36.3% L1:53.2% BI:10.5%
[libx264 @ 0x7fbc9400a000] 8x8 transform intra:71.7% inter:86.5%
[libx264 @ 0x7fbc9400a000] coded y,uvDC,uvAC intra: 52.7% 78.6% 18.2% inter: 14.1% 26.4% 0.4%
[libx264 @ 0x7fbc9400a000] i16 v,h,dc,p: 26% 18%  5% 51%
[libx264 @ 0x7fbc9400a000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 13% 20%  4%  8% 12%  6%  8%  5%
[libx264 @ 0x7fbc9400a000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 15% 12%  4% 14% 14%  7%  5%  2%
[libx264 @ 0x7fbc9400a000] i8c dc,h,v,p: 45% 12% 27% 16%
[libx264 @ 0x7fbc9400a000] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fbc9400a000] ref P L0: 65.2% 18.5% 11.3%  5.0%
[libx264 @ 0x7fbc9400a000] ref B L0: 90.7%  9.1%  0.2%
[libx264 @ 0x7fbc9400a000] ref B L1: 99.1%  0.9%
[libx264 @ 0x7fbc9400a000] kb/s:6463.90

Answer 1

问题

从您的控制台输出：

No pixel format specified, yuvj422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.

解决方案

将-pix_fmt yuv420p作为输出选项添加到命令中。