我正在尝试从编号为 1 到 100 的图像序列创建 mp4 视频。问题是我不断得到黑色的输出视频。每幅图像都是这样
一直到 100。我使用过的 FFMPEG 命令如下
ffmpeg -r 30 -i img%04d.png -c:v libx264 -crf 23 -pix_fmt yuv420p out.mp4
该命令的输出如下，
ffmpeg version N-69608-g9dc45d1 Copyright (c) 2000-2015 the FFmpeg developers built with gcc
4.9.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-
bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --
enable-libbluray --enab
le-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc
--enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --
enable-libopenjp
eg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex
--enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable
-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
libavutil 54. 18.100 / 54. 18.100
libavcodec 56. 21.102 / 56. 21.102
libavformat 56. 19.100 / 56. 19.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 9.103 / 5. 9.103
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, image2, from 'img%04d.png':
Duration: 00:00:04.00, start: 0.000000, bitrate: N/A
Stream #0:0: Video: png, rgba, 480x320, 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'out.mp4' already exists. Overwrite ? [y/N] y
[libx264 @ 00000000049238a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 00000000049238a0] profile High, level 2.1
[libx264 @ 00000000049238a0] 264 - core 144 r2525 40bb568 - H.264/MPEG-4 AVC codec - Copyleft
2003-2014 - 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, mp4, to 'out.mp4':
Metadata:
encoder : Lavf56.19.100
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 480x320, q=-1--1, 30 fps,
15360 tbn, 30 tbc
Metadata:
encoder : Lavc56.21.102 libx264
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Press [q] to stop, [?] for help
frame= 100 fps=0.0 q=-1.0 Lsize= 5kB time=00:00:03.26 bitrate= 11.4kbits/s
video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 77.850037%
[libx264 @ 00000000049238a0] frame I:1 Avg QP:10.00 size: 77
[libx264 @ 00000000049238a0] frame P:25 Avg QP:10.28 size: 25
[libx264 @ 00000000049238a0] frame B:74 Avg QP:13.68 size: 17
[libx264 @ 00000000049238a0] consecutive B-frames: 1.0% 0.0% 3.0% 96.0%
[libx264 @ 00000000049238a0] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 00000000049238a0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.0% 0.0% 0.0% 0.0%
0.0% skip:100.0%
[libx264 @ 00000000049238a0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct:
0.0% skip:100.0%
[libx264 @ 00000000049238a0] 8x8 transform intra:0.0%
[libx264 @ 00000000049238a0] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
[libx264 @ 00000000049238a0] i16 v,h,dc,p: 95% 0% 5% 0%
[libx264 @ 00000000049238a0] i8c dc,h,v,p: 100% 0% 0% 0%
[libx264 @ 00000000049238a0] Weighted P-Frames: Y:0.0% UV:0.0%
所有 100 幅图像的编号均为“0001.png”至“0100.png”。我使用 Java 代码创建了这些图像。我使用 ffplay 播放了 3 秒长的输出视频，如下所示：
我查看了此处发布的其他相关问题，但所有建议均未解决问题。这是我第一次使用 FFMPEG，因此我不确定我遗漏了什么。如能提供帮助，我将不胜感激。
谢谢！