我正在编写一个使用unix命令进行文件转换/渲染的python脚本。我试图加入一些带有png文件的mp3文件，以获得mp4s，这是mp3播放的图片。但是，我已经尝试了很多不同的编解码器和设置，输出mp4视频似乎从来没有音频。我已经看过任何与ffmpeg有关的问题的答案，并且没有找到解决方案。
我目前正在努力工作的一些命令：
ffmpeg -loop 1 -i slide_shot%d.png -i %s -c:v libx264 -pix_fmt yuv420p
-s 720x540 -t %.3f -c:a aac -b:a 192k -shortest out%d.mp4"
% (i, aud, slideTime, i)
ffmpeg -loop 1 -i slide_shot%d.png -i %s -shortest -t %.3f -write_xing
0 -c:v libx264 -c:a libmp3lame -pix_fmt yuv420p -tune stillimage out%d.mp4"
% (i, aud, slideTime, i)
ffmpeg -loop 1 -i slide_shot%d.png -i %s -shortest -t %.3f -write_xing
0 -c:v libx264 -c:a copy -pix_fmt yuv420p -tune stillimage out%d.mp4"
% (i, aud, slideTime, i)
我目前正在使用第三个。但是，他们都没有给我任何音频。作为参考，我是一个用于命名一致性的循环迭代器，aud是音频文件路径，而slideTime是视频应该采用的秒数。
使用此命令，我目前在终端中获得此输出：
ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
built with Apple LLVM version 7.0.2 (clang-700.1.81)
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.2 --enable-shared
--enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-
tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --
enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --
enable-vda
libavutil 55. 17.103 / 55. 17.103
libavcodec 57. 24.102 / 57. 24.102
libavformat 57. 25.100 / 57. 25.100
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 31.100 / 6. 31.100
libavresample 3. 0. 0 / 3. 0. 0
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, png_pipe, from 'slide_shot16.png':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 720x540, 25 fps, 25 tbr, 25 tbn, 25
tbc
[mp3 @ 0x7fe4f1817e00] Skipping 0 bytes of junk at 0.
[mp3 @ 0x7fe4f1817e00] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'pres_projects/Cytokine sepsis 13/data/a24x43.mp3':
Duration: 00:02:04.11, start: 0.000000, bitrate: 23 kb/s
Stream #1:0: Audio: mp3, 22050 Hz, mono, s16p, 24 kb/s
[libx264 @ 0x7fe4f1808000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x7fe4f1808000] profile High, level 3.0
[libx264 @ 0x7fe4f1808000] 264 - core 148 r2668 fd2c324 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:-3:-3 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=2.00:0.70 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=12 lookahead_threads=2 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=1:1.20
Output #0, mp4, to 'out16.mp4':
Metadata:
encoder : Lavf57.25.100
Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x540, q=-1--1, 25 fps, 12800 tbn, 25 tbc
Metadata:
encoder : Lavc57.24.102 libx264
Side data:
unknown side data type 10 (24 bytes)
Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 22050 Hz, mono, 24 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 132 fps=0.0 q=28.0 size=40kB time=00:00:02.96 bitrate=111.8kbits/
frame= 272 fps=271 q=28.0 size= 61kB time=00:00:08.56 bitrate= 58.2kbits/
frame= 404 fps=269 q=28.0 size= 113kB time=00:00:13.84 bitrate= 66.6kbits/
frame= 537 fps=268 q=28.0 size= 132kB time=00:00:19.16 bitrate= 56.2kbits/
frame= 672 fps=268 q=28.0 size= 184kB time=00:00:24.56 bitrate= 61.3kbits/
frame= 808 fps=268 q=28.0 size= 236kB time=00:00:30.00 bitrate= 64.5kbits/
frame= 943 fps=268 q=28.0 size= 255kB time=00:00:35.40 bitrate= 59.1kbits/
frame= 1087 fps=271 q=28.0 size= 309kB time=00:00:41.16 bitrate= 61.5kbits/
frame= 1219 fps=270 q=28.0 size= 328kB time=00:00:46.44 bitrate= 57.8kbits/
frame= 1355 fps=270 q=28.0 size= 380kB time=00:00:51.88 bitrate= 60.0kbits/frame= 1494 fps=271 q=28.0 size= 400kB time=00:00:57.44 bitrate= 57.1kbits/
frame= 1632 fps=271 q=28.0 size= 453kB time=00:01:02.96 bitrate= 58.9kbits/
frame= 1767 fps=271 q=28.0 size= 472kB time=00:01:08.36 bitrate= 56.6kbits/
frame= 1893 fps=269 q=28.0 size= 523kB time=00:01:13.40 bitrate= 58.4kbits/
frame= 2020 fps=268 q=28.0 size= 541kB time=00:01:18.48 bitrate= 56.5kbits/
frame= 2147 fps=267 q=28.0 size= 592kB time=00:01:23.56 bitrate= 58.1kbits/
frame= 2275 fps=267 q=28.0 size= 611kB time=00:01:28.68 bitrate= 56.4kbits/
frame= 2401 fps=266 q=28.0 size= 661kB time=00:01:33.72 bitrate= 57.8kbits/
frame= 2528 fps=265 q=28.0 size= 680kB time=00:01:38.80 bitrate= 56.4kbits/
frame= 2654 fps=264 q=28.0 size= 731kB time=00:01:43.84 bitrate= 57.6kbits/
frame= 2781 fps=264 q=28.0 size= 749kB time=00:01:48.92 bitrate= 56.3kbits/
frame= 2906 fps=263 q=28.0 size= 799kB time=00:01:53.92 bitrate= 57.5kbits/
frame= 3033 fps=263 q=28.0 size= 818kB time=00:01:59.00 bitrate= 56.3kbits/
frame= 3102 fps=261 q=-1.0 Lsize= 983kB time=00:02:04.08 bitrate= 64.9kbits/s speed=10.5x
video:505kB audio:364kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 13.169518%
[libx264 @ 0x7fe4f1808000] frame I:13 Avg QP:14.07 size: 33159
[libx264 @ 0x7fe4f1808000] frame P:782 Avg QP: 6.24 size: 36
[libx264 @ 0x7fe4f1808000] frame B:2307 Avg QP: 9.67 size: 25
[libx264 @ 0x7fe4f1808000] consecutive B-frames: 0.8% 0.0% 0.0% 9 9.2%
[libx264 @ 0x7fe4f1808000] mb I I16..4: 44.1% 26.2% 29.6%
[libx264 @ 0x7fe4f1808000] 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 @ 0x7fe4f1808000] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.1% 0.0% 0.0% direct: 0.0% skip:99.9% L0:40.4% L1:59.6% BI: 0.0%
[libx264 @ 0x7fe4f1808000] 8x8 transform intra:26.1% inter:77.7%
[libx264 @ 0x7fe4f1808000] coded y,uvDC,uvAC intra: 23.8% 9.6% 8.1% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x7fe4f1808000] i16 v,h,dc,p: 60% 33% 7% 0%
[libx264 @ 0x7fe4f1808000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 57% 12% 29% 0% 0% 0% 0% 0% 2%
[libx264 @ 0x7fe4f1808000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 29% 14% 2% 3% 4% 4% 3% 4%
[libx264 @ 0x7fe4f1808000] i8c dc,h,v,p: 74% 21% 5% 0%
[libx264 @ 0x7fe4f1808000] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7fe4f1808000] ref P L0: 95.4% 1.1% 3.5%
[libx264 @ 0x7fe4f1808000] ref B L0: 8.5% 90.2% 1.3%
[libx264 @ 0x7fe4f1808000] kb/s:33.31
有没有人遇到过类似的问题，如果有的话，你是怎么解决它的？提前感谢您查看我的问题。
答案 0 :(得分：2)
QuickTime *不会解码MP4容器中的MP3音频。 Windows Media Player也存在问题，但只会解码某些音频采样率。 VLC和mpv工作正常。一些解决方案：
.mov。更多信息：
ffmpeg merging mp3, mp4, no sound with copy codec
*在OS X 10.11.5上使用QuickTime 10.4进行测试。