我正在尝试使用 FFMPEG 将一堆电影转换为 h.264 mp4。这些电影来自各种便携式摄像机，例如 Flip Mino HD 和 Kodak ZI8。我在处理来自 ZI8 的视频时遇到的一个问题是它似乎导致 FFMPEG 出现段错误。
这是我的命令：
ffmpeg -i 'XmasSailor720p60fps.MOV' -threads 2 -acodec libfaac -ab 96kb -vcodec libx264 -vpre hq -b 500kb -s 484x272 XmasSailor.mp4
输出如下：
FFmpeg version SVN-r20668, Copyright (c) 2000-2009 Fabrice Bellard, et al.
built on Dec 2 2009 18:37:34 with gcc 4.2.4 (Ubuntu 4.2.4-1ubuntu4)
configuration: --enable-libfaac --enable-libfaad --enable-libmp3lame --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared
libavutil 50. 5. 1 / 50. 5. 1
libavcodec 52.42. 0 / 52.42. 0
libavformat 52.39. 2 / 52.39. 2
libavdevice 52. 2. 0 / 52. 2. 0
libswscale 0. 7. 2 / 0. 7. 2
libpostproc 51. 2. 0 / 51. 2. 0
Seems stream 0 codec frame rate differs from container frame rate: 59.94 (60000/1001) -> 29.97 (30000/1001)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'XmasSailor720p60fps.MOV':
Duration: 00:00:05.37, start: 0.000000, bitrate: 12021 kb/s
Stream #0.0(eng): Video: h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9], 11994 kb/s, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 128 kb/s
Metadata
major_brand : qt
minor_version : 0
compatible_brands: qt
comment : KODAK Zi8 Pocket Video Camera
comment-eng : KODAK Zi8 Pocket Video Camera
[libx264 @ 0x99e1020]using SAR=1/1
[libx264 @ 0x99e1020]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
[libx264 @ 0x99e1020]profile High, level 2.1
Output #0, mp4, to 'XmasSailor.mp4':
Stream #0.0(eng): Video: libx264, yuv420p, 484x272 [PAR 1:1 DAR 121:68], q=10-51, 500 kb/s, 30k tbn, 29.97 tbc
Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 96 kb/s
Metadata
comment : Encoded with the Statusfirm Video Transcoder
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
[h264 @ 0x99de950]B picture before any references, skipping
[h264 @ 0x99de950]decode_slice_header error
[h264 @ 0x99de950]no frame!
Error while decoding stream #0.0
[h264 @ 0x99de950]B picture before any references, skipping
[h264 @ 0x99de950]decode_slice_header error
[h264 @ 0x99de950]no frame!
Error while decoding stream #0.0
frame= 20 fps= 0 q=13797729.0 size= 0kB time=0.66 bitrate= 0.6kbits/s
frame= 39 fps= 37 q=13797729.0 size= 0kB time=1.30 bitrate= 0.3kbits/s
frame= 48 fps= 30 q=33.0 size= 11kB time=0.10 bitrate= 903.0kbits/s
frame= 58 fps= 27 q=31.0 size= 22kB time=0.43 bitrate= 421.0kbits/s
frame= 67 fps= 25 q=29.0 size= 41kB time=0.73 bitrate= 462.6kbits/s
frame= 75 fps= 23 q=29.0 size= 59kB time=1.00 bitrate= 486.7kbits/s
frame= 83 fps= 22 q=29.0 size= 81kB time=1.27 bitrate= 521.9kbits/s
frame= 90 fps= 21 q=29.0 size= 97kB time=1.50 bitrate= 530.1kbits/s
frame= 98 fps= 20 q=29.0 size= 114kB time=1.77 bitrate= 526.9kbits/s
frame= 106 fps= 20 q=29.0 size= 134kB time=2.04 bitrate= 537.7kbits/s
frame= 114 fps= 19 q=29.0 size= 150kB time=2.30 bitrate= 533.7kbits/s
frame= 122 fps= 19 q=29.0 size= 172kB time=2.57 bitrate= 547.8kbits/s
frame= 130 fps= 19 q=29.0 size= 193kB time=2.84 bitrate= 557.5kbits/s
frame= 136 fps= 18 q=29.0 size= 211kB time=3.04 bitrate= 570.0kbits/s
frame= 144 fps= 18 q=29.0 size= 242kB time=3.30 bitrate= 599.5kbits/s
frame= 152 fps= 17 q=30.0 size= 261kB time=3.57 bitrate= 598.6kbits/s
frame= 157 fps= 15 q=-1.0 Lsize= 368kB time=5.21 bitrate= 579.3kbits/s
video:302kB audio:61kB global headers:0kB muxing overhead 1.416371%
[libx264 @ 0x99e1020]frame I:1 Avg QP:27.22 size: 8720
[libx264 @ 0x99e1020]frame P:48 Avg QP:25.15 size: 3759
[libx264 @ 0x99e1020]frame B:108 Avg QP:30.10 size: 1105
[libx264 @ 0x99e1020]consecutive B-frames: 0.6% 11.5% 28.8% 59.0%
[libx264 @ 0x99e1020]mb I I16..4: 28.5% 47.6% 23.9%
[libx264 @ 0x99e1020]mb P I16..4: 0.8% 1.3% 0.5% P16..4: 50.6% 17.7% 13.1% 0.0% 0.0% skip:15.9%
[libx264 @ 0x99e1020]mb B I16..4: 0.2% 0.3% 0.1% B16..8: 44.0% 1.2% 2.6% direct: 5.1% skip:46.5% L0:45.5% L1:51.0% BI: 3.5%
[libx264 @ 0x99e1020]final ratefactor: 23.51
[libx264 @ 0x99e1020]8x8 transform intra:49.9% inter:67.9%
[libx264 @ 0x99e1020]direct mvs spatial:98.1% temporal:1.9%
[libx264 @ 0x99e1020]coded y,uvDC,uvAC intra: 54.7% 76.1% 41.4% inter: 17.1% 24.4% 7.8%
[libx264 @ 0x99e1020]i16 v,h,dc,p: 18% 52% 5% 25%
[libx264 @ 0x99e1020]i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 22% 9% 7% 10% 10% 9% 8% 13%
[libx264 @ 0x99e1020]i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 18% 8% 8% 10% 13% 10% 9% 12%
[libx264 @ 0x99e1020]Weighted P-Frames: Y:10.4%
[libx264 @ 0x99e1020]ref P L0: 60.2% 15.3% 11.0% 7.6% 5.2% 0.7%
[libx264 @ 0x99e1020]ref B L0: 72.6% 15.6% 11.8%
[libx264 @ 0x99e1020]kb/s:471.17
Segmentation fault
我想知道是否有其他人遇到过类似的问题。我无法通过 Google 找到任何有用的信息。
我的另一个问题是，是否有人知道有哪家公司为 FFMPEG 提供付费支持。
感谢您的时间。
答案1
我刚刚遇到了与 libx264 编码类似的问题，通过对此事的检查，我得到了以下几点。
- 使用 gcc >= 4.2
- 确保您的 ffmpeg 是针对相同的 libx264 版本进行编译的
从你的输出可以明显看出，#1 已经失败了，因此请像这样检查 #2 （路径可能需要修改）
ldd /usr/bin/ffmpeg | grep x264
进而...
cat /usr/include/x264.h | grep X264_BUILD
（来源）
对我来说，这已经检查过了，我只需要不进行 2 遍编码。尝试不使用线程选项，这可能会解决问题。我在旧的 Red Hat 机器上遇到了麻烦，但我的 Gentoo 桌面一点问题都没有，我称之为源包管理器的胜利！