我想用 ffmpeg 合并图像音频和字幕，但是我这样做不起作用：
ffmpeg -i audio.mp3 -i 1.png -vcodec libx264 -r 23.976 -vf "ass='subtitle.ass'" -acodec copy video.mp4
我可以看到图像并听到音乐，但听不到字幕。以下是控制台输出：
ffmpeg version 2.6.9 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.9.2 (Debian 4.9.2-10) configuration: --prefix=/usr
--extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree
--enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-vaapi --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu libavutil 54. 20.100 / 54. 20.100 libavcodec 56. 26.100 / 56. 26.100 libavformat 56. 25.101 / 56. 25.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 11.102 / 5. 11.102 libavresample 2. 1. 0 /
2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 1.100 / 1. 1.100 libpostproc 53. 3.100 / 53. 3.100 [mjpeg @ 0x1802f00] Changeing bps to 8 Input #0, mp3, from 'audio.mp3': Metadata:
album : もしもからきっと
artist : 東條希(CV.楠田亜衣奈)
genre : Anime
title : もしもからきっと
track : 1/2
date : 2014 Duration: 00:05:18.90, start: 0.025056, bitrate: 322 kb/s
Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
Metadata:
encoder : LAME3.99r
Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 300x376, 90k tbr, 90k tbn, 90k tbc
Metadata:
title :
comment : Cover (front) Input #1, png_pipe, from '1.png': Duration: N/A, bitrate: N/A
Stream #1:0: Video: png, rgb24, 668x376 [SAR 2835:2835 DAR 167:94], 25 tbr, 25 tbn, 25 tbc [Parsed_ass_0 @ 0x17cb6c0] Added subtitle file: 'subtitle.ass' (2 styles, 11 events) No pixel format specified, yuv444p for H.264 encoding chosen. Use -pix_fmt yuv420p for compatibility with outdated media players. [libx264 @ 0x180f9a0] using SAR=1/1 [libx264 @ 0x180f9a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 [libx264 @ 0x180f9a0] profile High 4:4:4 Predictive, level 3.0, 4:4:4 8-bit [libx264 @ 0x180f9a0] 264 - core 146 - 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=4 threads=3 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=23 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 'video.mp4': Metadata:
album : もしもからきっと
artist : 東條希(CV.楠田亜衣奈)
genre : Anime
title : もしもからきっと
track : 1/2
date : 2014
encoder : Lavf56.25.101
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 668x376 [SAR 1:1 DAR 167:94], q=-1--1, 23.98 fps, 11988 tbn,
23.98 tbc
Metadata:
encoder : Lavc56.26.100 libx264
Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 44100 Hz, stereo, 320 kb/s
Metadata:
encoder : LAME3.99r Stream mapping: Stream #1:0 -> #0:0 (png (native) -> h264 (libx264)) Stream #0:0 -> #0:1 (copy) Press [q] to stop, [?] for help frame= 1 fps=0.0 q=28.0 Lsize= 12524kB time=00:05:18.87 bitrate= 321.7kbits/s video:17kB audio:12457kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.394340% [libx264 @ 0x180f9a0] frame I:1 Avg QP:31.93 size: 17171 [libx264 @ 0x180f9a0] mb I I16..4: 1.2% 77.3% 21.5% [libx264 @ 0x180f9a0] 8x8 transform intra:77.3% [libx264 @ 0x180f9a0] coded y,u,v intra: 41.5% 25.9% 25.0% [libx264 @ 0x180f9a0] i16 v,h,dc,p: 58% 25% 17% 0% [libx264 @ 0x180f9a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 39% 8% 38% 2% 2% 3% 2% 3% 3% [libx264 @ 0x180f9a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 18% 12% 7% 9% 8% 9% 7% 7% [libx264 @ 0x180f9a0] kb/s:3293.54
答案1
使用
ffmpeg -i audio.mp3 -loop 1 -i 1.png -c:v libx264 -r 24000/1001 -vf "ass='subtitle.ass'" -pix_fmt yuv420p -c:a copy -map 1:v -map 0:a -shortest video.mp4
FFmpeg 通常处理定时媒体序列，即视频或音频或图像序列。当输入单个图像时，它会将其视为一个持续时间的帧，1/fps其中 fps 通常为 25。因此，没有视频画布可以绘制字幕。向图像添加输入循环选项会告诉 FFmpeg 从中生成无限的视频流。