当我使用 FFmpeg 和 x264 编解码器将 EXR 序列转换为 QuickTime MOV 文件时，它会对视频进行编码 - 但在 QuickTime Player 和 Windows Media Player 中它只是黑色！
但是当我用 VLC 打开它时，我可以看到图像，它看起来不错。当我用 JPG 序列而不是 EXR 尝试同样的事情时，它完美地工作了！有人知道那是什么吗？
这是我的 FFmpeg 代码：
ffmpeg -y -i C:/seq_v001.%04d.exr -c:v libx264 -preset slow -crf 17 C:/out.mov
以下是控制台输出：
ffmpeg version N-47062-g26c531c Copyright (c) 2000-2012 the FFmpeg developers
built on Nov 25 2012 12:25:21 with gcc 4.7.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-pthreads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 9.100 / 52. 9.100
libavcodec 54. 77.100 / 54. 77.100
libavformat 54. 37.100 / 54. 37.100
libavdevice 54. 3.100 / 54. 3.100
libavfilter 3. 23.102 / 3. 23.102
libswscale 2. 1.102 / 2. 1.102
libswresample 0. 17.101 / 0. 17.101
libpostproc 52. 2.100 / 52. 2.100
[image2 @ 000000000025e4c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, image2, from 'C:/seq_v001.%04d.exr':
Duration: 00:00:04.00, start: 0.000000, bitrate: N/A
Stream #0:0: Video: exr, rgb48le, 1920x1080 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
[libx264 @ 0000000001fd0ea0] using SAR=1/1
[libx264 @ 0000000001fd0ea0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0000000001fd0ea0] profile High 4:4:4 Predictive, level 5.0, 4:4:4 8-bit
[libx264 @ 0000000001fd0ea0] 264 - core 128 r2216 198a7ea - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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=4 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mov, to 'C:/out.mov':
Metadata:
encoder : Lavf54.37.100
Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv444p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 12800 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (exr -> libx264)
Press [q] to stop, [?] for help
[exr @ 0000000001fddea0] Found more than one compression attribute
[exr @ 0000000001fdda40] Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
[exr @ 0000000001fde740] Found more than one compression attribute
[exr @ 0000000001fdeb80] Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
frame= 7 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
[exr @ 0000000001fdfcc0] Found more than one compression attribute
[exr @ 0000000001fe0120] Found more than one compression attribute
[exr @ 0000000001fe0560] Found more than one compression attribute
[exr @ 0000000001fe09c0] Found more than one compression attribute
[exr @ 0000000001fe0e00] Found more than one compression attribute
[exr @ 0000000001fddea0] Found more than one compression attribute
[exr @ 0000000001fdda40] Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
frame= 17 fps= 16 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fdeb80] Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
[exr @ 0000000001fdf420] Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
[exr @ 0000000001fdfcc0] Found more than one compression attribute
[exr @ 0000000001fe0120] Found more than one compression attribute
[exr @ 0000000001fe0560] Found more than one compression attribute
[exr @ 0000000001fe09c0] Found more than one compression attribute
[exr @ 0000000001fe0e00] Found more than one compression attribute
[exr @ 0000000001fddea0] Found more than one compression attribute
frame= 28 fps= 18 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
[exr @ 0000000001fde740] Found more than one compression attribute
[exr @ 0000000001fdeb80] Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
[exr @ 0000000001fdf420] Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
[exr @ 0000000001fdfcc0] Found more than one compression attribute
[exr @ 0000000001fe0120] Found more than one compression attribute
[exr @ 0000000001fe0560] Found more than one compression attribute
[exr @ 0000000001fe09c0] Found more than one compression attribute
frame= 39 fps= 19 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fddea0] Found more than one compression attribute
[exr @ 0000000001fdda40] Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
[exr @ 0000000001fde740] Found more than one compression attribute
[exr @ 0000000001fdeb80] Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
[exr @ 0000000001fdf420] Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
[exr @ 0000000001fdfcc0] Found more than one compression attribute
[exr @ 0000000001fe0120] Found more than one compression attribute
frame= 50 fps= 19 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fe09c0] Found more than one compression attribute
[exr @ 0000000001fe0e00] Found more than one compression attribute
[exr @ 0000000001fddea0] Found more than one compression attribute
[exr @ 0000000001fdda40] Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
[exr @ 0000000001fde740] Found more than one compression attribute
frame= 57 fps= 16 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
[exr @ 0000000001fdf420] Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
[exr @ 0000000001fdfcc0] Found more than one compression attribute
[exr @ 0000000001fe0120] Found more than one compression attribute
[exr @ 0000000001fe0560] Found more than one compression attribute
[exr @ 0000000001fe09c0] Found more than one compression attribute
[exr @ 0000000001fe0e00] Found more than one compression attribute
frame= 66 fps= 17 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fdda40] Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
[exr @ 0000000001fde740] Found more than one compression attribute
[exr @ 0000000001fdeb80] Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
[exr @ 0000000001fdf420] Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
frame= 74 fps= 16 q=22.0 size= 255kB time=00:00:00.00 bitrate= 0.0kbits/s
Found more than one compression attribute
[exr @ 0000000001fe0120] Found more than one compression attribute
[exr @ 0000000001fe0560] Found more than one compression attribute
[exr @ 0000000001fe09c0] Found more than one compression attribute
[exr @ 0000000001fe0e00] Found more than one compression attribute
frame= 79 fps= 16 q=22.0 size= 467kB time=00:00:00.20 bitrate=19134.5kbits/s
Found more than one compression attribute
[exr @ 0000000001fdda40] Found more than one compression attribute
[exr @ 0000000001fde2e0] Found more than one compression attribute
[exr @ 0000000001fde740] Found more than one compression attribute
frame= 83 fps= 15 q=22.0 size= 652kB time=00:00:00.36 bitrate=14829.5kbits/s
Found more than one compression attribute
[exr @ 0000000001fdefe0] Found more than one compression attribute
[exr @ 0000000001fdf420] Found more than one compression attribute
[exr @ 0000000001fdf880] Found more than one compression attribute
[exr @ 0000000001fdfcc0] Found more than one compression attribute
frame= 100 fps= 15 q=22.0 size= 1505kB time=-577014:-32:-22.-77 bitrate= -0.0kbits/s
frame= 100 fps=9.6 q=-1.0 Lsize= 3831kB time=00:00:03.92 bitrate=8006.7kbits/s
video:3829kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.050698%
[libx264 @ 0000000001fd0ea0] frame I:1 Avg QP:18.35 size:168478
[libx264 @ 0000000001fd0ea0] frame P:31 Avg QP:16.10 size: 83540
[libx264 @ 0000000001fd0ea0] frame B:68 Avg QP:20.34 size: 17093
[libx264 @ 0000000001fd0ea0] consecutive B-frames: 7.0% 4.0% 9.0% 80.0%
[libx264 @ 0000000001fd0ea0] mb I I16..4: 22.6% 67.9% 9.4%
[libx264 @ 0000000001fd0ea0] mb P I16..4: 1.3% 7.3% 0.6% P16..4: 20.3% 10.1% 5.7% 0.0% 0.0% skip:54.6%
[libx264 @ 0000000001fd0ea0] mb B I16..4: 0.2% 0.8% 0.1% B16..8: 30.8% 4.8% 1.2% direct: 1.5% skip:60.6% L0:46.0% L1:48.6% BI: 5.4%
[libx264 @ 0000000001fd0ea0] 8x8 transform intra:76.0% inter:78.8%
[libx264 @ 0000000001fd0ea0] direct mvs spatial:85.3% temporal:14.7%
[libx264 @ 0000000001fd0ea0] coded y,u,v intra: 87.8% 56.3% 53.3% inter: 13.0% 6.1% 5.0%
[libx264 @ 0000000001fd0ea0] i16 v,h,dc,p: 12% 9% 24% 55%
[libx264 @ 0000000001fd0ea0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 8% 32% 7% 11% 8% 9% 7% 9%
[libx264 @ 0000000001fd0ea0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 8% 5% 8% 23% 14% 11% 9% 11%
[libx264 @ 0000000001fd0ea0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0000000001fd0ea0] ref P L0: 40.6% 9.5% 25.3% 13.3% 9.3% 2.1%
[libx264 @ 0000000001fd0ea0] ref B L0: 64.9% 24.5% 8.7% 1.9%
[libx264 @ 0000000001fd0ea0] ref B L1: 89.8% 10.2%
[libx264 @ 0000000001fd0ea0] kb/s:7841.10
答案1
你正在使用 YUV 4:4:4 颜色空间转换视频。这实际上不是标准——大多数（某些？）播放器只支持色度二次采样YUV 4：2：0 planar，包括 Windows Media Player 和 QuickTime。
您的 JPEG 图像通常会使用 YUV 4:2:0 子采样（yuvj420p），因此 FFmpeg 将默认生成兼容的视频。
尝试使用以下方法对视频进行编码-pix_fmt yuv420p：
ffmpeg -y -i C:/seq_v001.%04d.exr -c:v libx264 -pix_fmt yuv420p -preset slow -crf 17 C:/out.mov
与非子采样版本相比，您可能不会注意到任何巨大的质量损失——眼睛对颜色信息的敏感度不如对空间信息的敏感度。