我正在尝试将音频 mp3 文件与视频 mp4 文件合并。我希望将音频文件的音量调低一点，以便将其作为视频片段的背景音乐。
这就是我的代码现在的样子（我尝试改编以前合并 2 个 mp3 的代码）--
ffmpeg \
-i output.mp4 \
-i music.mp3 \
-filter_complex "[0:a]volume=0.15[A];[1:a][A]amerge[out]" \
-map [out] -y output-final.mp4 2>&1
编辑
在 iPhone 上使用带有 amerge 的 filter_complex 编码 mp4 视频时似乎出现问题。
控制台输出 -
ffmpeg version N-90767-g768c077-syslint Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-16)
configuration: --prefix=/usr/local/cpffmpeg --enable-shared --enable-nonfree --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --extra-cflags=-I/usr/local/cpffmpeg/include --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint
libavutil 56. 15.100 / 56. 15.100
libavcodec 58. 19.100 / 58. 19.100
libavformat 58. 13.100 / 58. 13.100
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 18.100 / 7. 18.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/path/to/output-4786-second.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.13.100
Duration: 00:00:13.58, start: 0.000000, bitrate: 798 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 767 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 29 kb/s (default)
Metadata:
handler_name : SoundHandler
Input #1, mp3, from '/path/to/buddy.mp3':
Duration: 00:02:02.12, start: 0.025057, bitrate: 112 kb/s
Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 112 kb/s
Metadata:
encoder : LAME3.99r
Stream mapping:
Stream #0:1 (aac) -> amerge:in0 (graph 0)
Stream #1:0 (mp3float) -> volume (graph 0)
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
amerge (graph 0) -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x1cae600] using SAR=1/1
[libx264 @ 0x1cae600] using cpu capabilities: none!
[libx264 @ 0x1cae600] profile Constrained Baseline, level 3.1
[libx264 @ 0x1cae600] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=22 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=24 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
[Parsed_amerge_2 @ 0x2ed3780] No channel layout for input 1
Output #0, mp4, to '/path/to/output-4786.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.13.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 24 fps, 12288 tbn, 24 tbc (default)
Metadata:
handler_name : VideoHandler
encoder : Lavc58.19.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, 3.0, fltp, 197 kb/s (default)
Metadata:
encoder : Lavc58.19.100 aac
frame= 82 fps=0.0 q=12.0 size= 0kB time=00:00:02.50 bitrate= 0.2kbits/s speed=4.97x
frame= 157 fps=156 q=18.0 size= 512kB time=00:00:05.57 bitrate= 752.7kbits/s speed=5.53x
frame= 210 fps=139 q=13.0 size= 1280kB time=00:00:07.80 bitrate=1344.0kbits/s speed=5.18x
frame= 273 fps=136 q=12.0 size= 1280kB time=00:00:10.40 bitrate=1008.0kbits/s speed=5.18x
frame= 326 fps=145 q=-1.0 Lsize= 1607kB time=00:00:13.54 bitrate= 972.3kbits/s speed=6.04x
video:1290kB audio:310kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.406112%
[libx264 @ 0x1cae600] frame I:2 Avg QP:15.50 size: 21673
[libx264 @ 0x1cae600] frame P:324 Avg QP:13.50 size: 3942
[libx264 @ 0x1cae600] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x1cae600] mb P I16..4: 1.6% 0.0% 0.0% P16..4: 12.7% 0.0% 0.0% 0.0% 0.0% skip:85.7%
[libx264 @ 0x1cae600] coded y,uvDC,uvAC intra: 25.5% 29.6% 12.4% inter: 4.2% 8.3% 1.4%
[libx264 @ 0x1cae600] i16 v,h,dc,p: 62% 18% 9% 11%
[libx264 @ 0x1cae600] i8c dc,h,v,p: 68% 16% 11% 5%
[libx264 @ 0x1cae600] kb/s:777.82
[aac @ 0x1caf980] Qavg: 4402.419
最近尝试的命令——
ffmpeg \
-i '.$thepath.'/output-'.$v_Id.'-second.mp4 \
-i '.$musicpath .'/'.$music.'.mp3 \
-filter_complex "[1:a]volume=0.15,apad[A];[0:a][A]amerge[out]" \
-c:v libx264 -c:a aac -map 0:v -map "[out]" \
-preset ultrafast -threads 0 -pix_fmt yuv420p -y '.$thepath.'/output-'.$v_Id.'.mp4 2>&1
答案1
使用
ffmpeg \
-i output.mp4 \
-i music.mp3 \
-filter_complex "[1:a]volume=0.15,apad[A];[0:a][A]amerge[out]" \
-c:v copy -map 0:v -map [out] -y output-final.mp4
答案2
请尝试这种方法
fun mix(): Array<String?> {
val cmdList = ArrayList<String>()
var cmds: Array<String?>? = null
try {
cmdList.add("-y")
cmdList.add("-ss")
cmdList.add(startVideoDuration.toString())
cmdList.add("-t")
cmdList.add(endVideoDuration.toString())
cmdList.add("-i")
cmdList.add(videoPath)
cmdList.add("-ss")
cmdList.add(startAudioDuration.toString())
cmdList.add("-t")
cmdList.add(endVideoDuration.toString())
cmdList.add("-stream_loop")
cmdList.add("-1")
cmdList.add("-i")
cmdList.add(audioPath)
if (videovolume == -1f && audiovolume > -1) {
cmdList.add("-c:v")
if (startVideoDuration > 0) {
cmdList.add("mpeg4")
cmdList.add("-b:v")
cmdList.add("2304000")
} else {
cmdList.add("copy")
}
cmdList.add("-c:a")
cmdList.add("aac")
cmdList.add("-map")
cmdList.add("1:a:0")
cmdList.add("-map")
cmdList.add("0:v:0")
cmdList.add("-strict")
cmdList.add("-2")
if (audiovolume < 0.99 || audiovolume > 1.01) {
cmdList.add("-vol")
cmdList.add((audiovolume * 100).toInt().toString())
}
}else{
cmdList.add("-c:v")
if (startVideoDuration > 0) {
cmdList.add("mpeg4")
cmdList.add("-b:v")
cmdList.add("2304000")
} else {
cmdList.add("copy")
}
cmdList.add("-map")
cmdList.add("0:v:0")
cmdList.add("-strict")
cmdList.add("-2")
cmdList.add("-filter_complex")
cmdList.add(
String.format(
"[0:a]aformat=sample_fmts=fltp:sample_rates=48000:channel_layouts=stereo,volume=%f[a0];" +
"[1:a]aformat=sample_fmts=fltp:sample_rates=48000:channel_layouts=stereo,volume=%f[a1];" +
"[a0][a1]amix=inputs=2:duration=first[aout]",
videovolume,
audiovolume
)
)
cmdList.add("-map")
cmdList.add("[aout]")
}
cmdList.add("-b:a")
cmdList.add("128000")
cmdList.add("-ac")
cmdList.add("2")
cmdList.add("-ar")
cmdList.add("44100")
cmdList.add("-movflags")
cmdList.add("faststart")
cmdList.add("-preset")
cmdList.add("ultrafast")
cmdList.add(outputpath)
cmds = arrayOfNulls<String>(cmdList.size)
cmdList.toArray(cmds)
} catch (e: java.lang.Exception) {
e.printStackTrace()
}
return cmds!!
}