（免责声明：我擅长 PHP，但不熟悉 ffmpeg 或命令行，因此我的所有代码都是从互联网上复制的）
我正在使用启用了 ffmpeg（版本 2.6.8）的共享主机。
为了使任何 ffmpeg 命令起作用，我需要添加-threads 1到命令中。一切都运行良好，直到我需要使用filter_complex。
例如，此命令：
ffmpeg -y -i "audio_1.mp3" -i "audio_2.mp3" -threads 1 -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map [a] -c:a libfdk_aac "test5.mp3" 2>&1
...应该覆盖两个 MP3 文件，但结果却是这样的输出：
Array (
[0] => ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
[1] => built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
[2] => configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libdc1394 --enable-libfaac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
[3] => libavutil 54. 20.100 / 54. 20.100
[4] => libavcodec 56. 26.100 / 56. 26.100
[5] => libavformat 56. 25.101 / 56. 25.101
[6] => libavdevice 56. 4.100 / 56. 4.100
[7] => libavfilter 5. 11.102 / 5. 11.102
[8] => libavresample 2. 1. 0 / 2. 1. 0
[9] => libswscale 3. 1.101 / 3. 1.101
[10] => libswresample 1. 1.100 / 1. 1.100
[11] => libpostproc 53. 3.100 / 53. 3.100
[12] => Input #0, mp3, from 'audio_1.mp3':
[13] => Metadata:
[14] => encoder : Lavf54.21.100
[15] => Duration: 00:00:04.10, start: 0.023021, bitrate: 64 kb/s
[16] => Stream #0:0: Audio: mp3, 48000 Hz, mono, s16p, 64 kb/s
[17] => Input #1, mp3, from 'audio_2.mp3':
[18] => Metadata:
[19] => encoder : Lavf54.21.100
[20] => Duration: 00:00:10.25, start: 0.023021, bitrate: 64 kb/s
[21] => Stream #1:0: Audio: mp3, 48000 Hz, mono, s16p, 64 kb/s
[22] => [AVFilterGraph @ 0x21748a0] Error initializing threading.
[23] => [AVFilterGraph @ 0x21748a0] Error creating filter 'amerge'
[24] => Error configuring filters.
)
我在网上找到了一些关于和的信息-filter_threads 1，-filter_complex_threads 1并试图将它们插入到命令的各个位置——错误总是
Unrecognized option 'filter_threads'.
Error splitting the argument list: Option not found
或者
Unrecognized option 'filter_complex_threads'.
Error splitting the argument list: Option not found
我与主机支持人员进行了交谈，他们说命令肯定是错误的，但是我尝试的所有操作都filter_complex因线程问题而失败。
我的过滤列表（ffmpeg -filters）显示：
Array
(
[0] => Filters:
[1] => T.. = Timeline support
[2] => .S. = Slice threading
[3] => ..C = Commmand support
[4] => A = Audio input/output
[5] => V = Video input/output
[6] => N = Dynamic number and/or type of input/output
[7] => | = Source or sink filter
[8] => T.. adelay A->A Delay one or more audio channels.
[9] => ... aecho A->A Add echoing to the audio.
[10] => ... aeval A->A Filter audio signal according to a specified expression.
[11] => T.. afade A->A Fade in/out input audio.
[12] => ... aformat A->A Convert the input audio to one of the specified formats.
[13] => ... ainterleave N->A Temporally interleave audio inputs.
[14] => ... allpass A->A Apply a two-pole all-pass filter.
[15] => ... amerge N->A Merge two or more audio streams into a single multi-channel stream.
[16] => ... amix N->A Audio mixing.
[17] => ... anull A->A Pass the source unchanged to the output.
[18] => T.. apad A->A Pad audio with silence.
[19] => ... aperms A->A Set permissions for the output audio frame.
[20] => ... aphaser A->A Add a phasing effect to the audio.
[21] => ... aresample A->A Resample audio data.
[22] => ... aselect A->N Select audio frames to pass in output.
[23] => ... asendcmd A->A Send commands to filters.
[24] => ... asetnsamples A->A Set the number of samples for each output audio frames.
[25] => ... asetpts A->A Set PTS for the output audio frame.
[26] => ... asetrate A->A Change the sample rate without altering the data.
[27] => ... asettb A->A Set timebase for the audio output link.
[28] => ... ashowinfo A->A Show textual information for each audio frame.
[29] => ... asplit A->N Pass on the audio input to N audio outputs.
[30] => ... astats A->A Show time domain statistics about audio frames.
[31] => ... astreamsync AA->AA Copy two streams of audio data in a configurable order.
[32] => ... asyncts A->A Sync audio data to timestamps
[33] => ..C atempo A->A Adjust audio tempo.
[34] => ... atrim A->A Pick one continuous section from the input, drop the rest.
[35] => ... bandpass A->A Apply a two-pole Butterworth band-pass filter.
[36] => ... bandreject A->A Apply a two-pole Butterworth band-reject filter.
[37] => ... bass A->A Boost or cut lower frequencies.
[38] => ... biquad A->A Apply a biquad IIR filter with the given coefficients.
[39] => ... channelmap A->A Remap audio channels.
[40] => ... channelsplit A->N Split audio into per-channel streams.
[41] => ... compand A->A Compress or expand audio dynamic range.
[42] => T.. dcshift A->A Apply a DC shift to the audio.
[43] => ... earwax A->A Widen the stereo image.
[44] => ... ebur128 A->N EBU R128 scanner.
[45] => ... equalizer A->A Apply two-pole peaking equalization (EQ) filter.
[46] => ... flanger A->A Apply a flanging effect to the audio.
[47] => ... highpass A->A Apply a high-pass filter with 3dB point frequency.
[48] => ... join N->A Join multiple audio streams into multi-channel output.
[49] => ..C ladspa N->A Apply LADSPA effect.
[50] => ... lowpass A->A Apply a low-pass filter with 3dB point frequency.
[51] => ... pan A->A Remix channels with coefficients (panning).
[52] => ... replaygain A->A ReplayGain scanner.
[53] => ... resample A->A Audio resampling and conversion.
[54] => ... silencedetect A->A Detect silence.
[55] => ... silenceremove A->A Remove silence.
[56] => ... treble A->A Boost or cut upper frequencies.
[57] => T.C volume A->A Change input volume.
[58] => ... volumedetect A->A Detect audio volume.
[59] => ... aevalsrc |->A Generate an audio signal generated by an expression.
[60] => ... anullsrc |->A Null audio source, return empty audio frames.
[61] => ... sine |->A Generate sine wave audio signal.
[62] => ... anullsink A->| Do absolutely nothing with the input audio.
[63] => ... alphaextract V->N Extract an alpha channel as a grayscale image component.
[64] => ... alphamerge VV->V Copy the luma value of the second input into the alpha channel of the first input.
[65] => ... ass V->V Render ASS subtitles onto input video using the libass library.
[66] => T.. bbox V->V Compute bounding box for each frame.
[67] => ... blackdetect V->V Detect video intervals that are (almost) black.
[68] => ... blackframe V->V Detect frames that are (almost) black.
[69] => TS. blend VV->V Blend two video frames into each other.
[70] => T.. boxblur V->V Blur the input.
[71] => T.. codecview V->V Visualize information about some codecs
[72] => T.. colorbalance V->V Adjust the color balance.
[73] => T.. colorchannelmixer V->V Adjust colors by mixing color channels.
[74] => T.. colorlevels V->V Adjust the color levels.
[75] => T.. colormatrix V->V Convert color matrix.
[76] => ... copy V->V Copy the input video unchanged to the output.
[77] => ... crop V->V Crop the input video.
[78] => T.. cropdetect V->V Auto-detect crop size.
[79] => TS. curves V->V Adjust components curves.
[80] => TS. dctdnoiz V->V Denoise frames using 2D DCT.
[81] => ... decimate N->V Decimate frames (post field matching filter).
[82] => ... dejudder V->V Remove judder produced by pullup.
[83] => T.. delogo V->V Remove logo from input video.
[84] => ... deshake V->V Stabilize shaky video.
[85] => T.. drawbox V->V Draw a colored box on the input video.
[86] => T.. drawgrid V->V Draw a colored grid on the input video.
[87] => T.C drawtext V->V Draw text on top of video frames using libfreetype library.
[88] => T.. edgedetect V->V Detect and draw edge.
[89] => ... elbg V->V Apply posterize effect, using the ELBG algorithm.
[90] => ..C eq V->V Adjust brightness, contrast, gamma, and saturation.
[91] => ... extractplanes V->N Extract planes as grayscale frames.
[92] => .S. fade V->V Fade in/out input video.
[93] => ... field V->V Extract a field from the input video.
[94] => ... fieldmatch N->V Field matching for inverse telecine.
[95] => T.. fieldorder V->V Set the field order.
[96] => ... format V->V Convert the input video to one of the specified pixel formats.
[97] => ... fps V->V Force constant framerate.
[98] => ... framepack VV->V Generate a frame packed stereoscopic video.
[99] => T.. framestep V->V Select one frame every N frames.
[100] => T.. fspp V->V Apply Fast Simple Post-processing filter.
[101] => T.. geq V->V Apply generic equation to each pixel.
[102] => T.. gradfun V->V Debands video quickly using gradients.
[103] => TS. haldclut VV->V Adjust colors using a Hald CLUT.
[104] => .S. hflip V->V Horizontally flip the input video.
[105] => T.. histeq V->V Apply global color histogram equalization.
[106] => ... histogram V->V Compute and draw a histogram.
[107] => T.. hqdn3d V->V Apply a High Quality 3D Denoiser.
[108] => .S. hqx V->V Scale the input by 2, 3 or 4 using the hq*x magnification algorithm.
[109] => T.C hue V->V Adjust the hue and saturation of the input video.
[110] => ... idet V->V Interlace detect Filter.
[111] => T.. il V->V Deinterleave or interleave fields.
[112] => ... interlace V->V Convert progressive video into interlaced.
[113] => ... interleave N->V Temporally interleave video inputs.
[114] => ... kerndeint V->V Apply kernel deinterlacing to the input.
[115] => .S. lenscorrection V->V Rectify the image by correcting for lens distortion.
[116] => TS. lut3d V->V Adjust colors using a 3D LUT.
[117] => T.. lut V->V Compute and apply a lookup table to the RGB/YUV input video.
[118] => T.. lutrgb V->V Compute and apply a lookup table to the RGB input video.
[119] => T.. lutyuv V->V Compute and apply a lookup table to the YUV input video.
[120] => ... mcdeint V->V Apply motion compensating deinterlacing.
[121] => ... mergeplanes N->V Merge planes.
[122] => ... mpdecimate V->V Remove near-duplicate frames.
[123] => T.. negate V->V Negate input video.
[124] => ... noformat V->V Force libavfilter not to use any of the specified pixel formats for the input to the next filter.
[125] => TS. noise V->V Add noise.
[126] => ... null V->V Pass the source unchanged to the output.
[127] => T.C overlay VV->V Overlay a video source on top of the input.
[128] => T.. owdenoise V->V Denoise using wavelets.
[129] => ... pad V->V Pad the input video.
[130] => ... palettegen V->V Find the optimal palette for a given stream.
[131] => ... paletteuse VV->V Use a palette to downsample an input video stream.
[132] => ... perms V->V Set permissions for the output video frame.
[133] => TS. perspective V->V Correct the perspective of video.
[134] => T.. phase V->V Phase shift fields.
[135] => ... pixdesctest V->V Test pixel format definitions.
[136] => T.C pp V->V Filter video using libpostproc.
[137] => T.. pp7 V->V Apply Postprocessing 7 filter.
[138] => ... psnr VV->V Calculate the PSNR between two video streams.
[139] => ... pullup V->V Pullup from field sequence to frames.
[140] => T.. qp V->V Change video quantization parameters.
[141] => T.. removelogo V->V Remove a TV logo based on a mask image.
[142] => ... repeatfields V->V Hard repeat fields based on MPEG repeat field flag.
[143] => TSC rotate V->V Rotate the input image.
[144] => T.. sab V->V Apply shape adaptive blur.
[145] => ... scale V->V Scale the input video size and/or convert the image format.
[146] => ... select V->N Select video frames to pass in output.
[147] => ... sendcmd V->V Send commands to filters.
[148] => ... separatefields V->V Split input video frames into fields.
[149] => ... setdar V->V Set the frame display aspect ratio.
[150] => ... setfield V->V Force field for the output video frame.
[151] => ... setpts V->V Set PTS for the output video frame.
[152] => ... setsar V->V Set the pixel sample aspect ratio.
[153] => ... settb V->V Set timebase for the video output link.
[154] => ... showinfo V->V Show textual information for each video frame.
[155] => T.. showpalette V->V Display frame palette
[156] => ... shuffleplanes V->V Shuffle video planes
[157] => .S. signalstats V->V Generate statistics from video analysis.
[158] => T.. smartblur V->V Blur the input video without impacting the outlines.
[159] => ... split V->N Pass on the input to N video outputs.
[160] => T.C spp V->V Apply a simple post processing filter.
[161] => ... stereo3d V->V Convert video stereoscopic 3D view.
[162] => ... subtitles V->V Render text subtitles onto input video using the libass library.
[163] => ... super2xsai V->V Scale the input by 2x using the Super2xSaI pixel art algorithm.
[164] => ... swapuv V->V Swap U and V components.
[165] => .S. tblend V->V Blend successive frames.
[166] => ... telecine V->V Apply a telecine pattern.
[167] => ... thumbnail V->V Select the most representative frame in a given sequence of consecutive frames.
[168] => ... tile V->V Tile several successive frames together.
[169] => ... tinterlace V->V Perform temporal field interlacing.
[170] => .S. transpose V->V Transpose input video.
[171] => ... trim V->V Pick one continuous section from the input, drop the rest.
[172] => T.. unsharp V->V Sharpen or blur the input video.
[173] => T.. uspp V->V Apply Ultra Simple / Slow Post-processing filter.
[174] => ... vflip V->V Flip the input video vertically.
[175] => T.. vignette V->V Make or reverse a vignette effect.
[176] => T.. w3fdif V->V Apply Martin Weston three field deinterlace.
[177] => .S. xbr V->V Scale the input using xBR algorithm.
[178] => TS. yadif V->V Deinterlace the input image.
[179] => T.. zoompan V->V Apply Zoom & Pan effect.
[180] => ... cellauto |->V Create pattern generated by an elementary cellular automaton.
[181] => ..C color |->V Provide an uniformly colored input.
[182] => ... haldclutsrc |->V Provide an identity Hald CLUT.
[183] => ... life |->V Create life.
[184] => ... mandelbrot |->V Render a Mandelbrot fractal.
[185] => ... mptestsrc |->V Generate various test pattern.
[186] => ... nullsrc |->V Null video source, return unprocessed video frames.
[187] => ... rgbtestsrc |->V Generate RGB test pattern.
[188] => ... smptebars |->V Generate SMPTE color bars.
[189] => ... smptehdbars |->V Generate SMPTE HD color bars.
[190] => ... testsrc |->V Generate test pattern.
[191] => ... nullsink V->| Do absolutely nothing with the input video.
[192] => ... avectorscope A->V Convert input audio to vectorscope video output.
[193] => ... concat N->N Concatenate audio and video streams.
[194] => ... showcqt A->V Convert input audio to a CQT (Constant Q Transform) spectrum video output.
[195] => ... showspectrum A->V Convert input audio to a spectrum video output.
[196] => ... showwaves A->V Convert input audio to a video output.
[197] => ... amovie |->N Read audio from a movie source.
[198] => ... movie |->N Read from a movie source.
[199] => ... ffbuffersink V->| Buffer video frames, and make them available to the end of the filter graph.
[200] => ... ffabuffersink A->| Buffer audio frames, and make them available to the end of the filter graph.
[201] => ... abuffer |->A Buffer audio frames, and make them accessible to the filterchain.
[202] => ... buffer |->V Buffer video frames, and make them accessible to the filterchain.
[203] => ... abuffersink A->| Buffer audio frames, and make them available to the end of the filter graph.
[204] => ... buffersink V->| Buffer video frames, and make them available to the end of the filter graph.
[205] => ... afifo A->A Buffer input frames and send them when they are requested.
[206] => ... fifo V->V Buffer input images and send them when they are requested.
)
... 显示amix（并且amerge我也一直在尝试）但没有显示complex（应该显示吗？我不知道）。
我现在不知道：
（a）我的命令是错误的
（b）ffmpeg 版本太旧，不支持复杂的滤镜
（c）服务器配置需要更改
帮助？！