【发布时间】：2016-01-19 22:27:47
【问题描述】：
我将 ffmpeg 命令的全部输出打印到我的服务器的 error.log 中——但据我所知，作业成功完成且没有错误。
有没有办法抑制输出？我见过人们将>/dev/null 2>/dev/null & 之类的东西附加到他们的命令中，但是这会强制命令立即返回并且作业在后台运行。不幸的是，我需要在前台运行作业，因为一旦作业完成，我需要对输出进行处理。
这是我正在运行的命令...
shell_exec('ffmpeg -i input.mp4 -f mp4 -c:v libx264 -preset slow -crf 24 -s 1280x720 -c:a libfdk_aac -profile:a aac_he -ar 22050 -b:a 64k -movflags +faststart output-1280x720.mp4');
这是我看到的输出...
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] ffmpeg version N-77432-gc0f67e1 Copyright (c) 2000-2015 the FFmpeg developers
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] built with gcc 4.4.5 (Debian 4.4.5-8)
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] configuration: --prefix=/usr --enable-nonfree --enable-libfreetype --enable-gpl --enable-libx264 --enable-x11grab --enable-zlib --enable-libvpx --enable-libtheora --enable-libvorbis --enable-libfdk-aac --enable-libmp3lame --enable-libopus
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libavutil 55. 11.100 / 55. 11.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libavcodec 57. 19.100 / 57. 19.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libavformat 57. 20.100 / 57. 20.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libavdevice 57. 0.100 / 57. 0.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libavfilter 6. 21.100 / 6. 21.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libswscale 4. 0.100 / 4. 0.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libswresample 2. 0.101 / 2. 0.101
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] libpostproc 54. 0.100 / 54. 0.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test-video.mp4':
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Metadata:
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] major_brand : mp42
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] minor_version : 0
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] compatible_brands: mp42mp41
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] creation_time : 2015-07-14 22:13:20
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Duration: 00:00:10.51, start: 0.000000, bitrate: 17178 kb/s
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 17170 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Metadata:
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] creation_time : 2015-07-14 22:13:20
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] handler_name : Alias Data Handler
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] encoder : AVC Coding
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (test-video-480p.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Codec AVOption profile () specified for output file #0 (test-video-480p.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] [libx264 @ 0x4518ea0] using SAR=1280/1281
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] [libx264 @ 0x4518ea0] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] [libx264 @ 0x4518ea0] profile High, level 3.0
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] [libx264 @ 0x4518ea0] 264 - core 120 r2151 a3f4407 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 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 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=24.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Output #0, mp4, to 'test-video-480p.mp4':
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Metadata:
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] major_brand : mp42
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] minor_version : 0
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] compatible_brands: mp42mp41
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] encoder : Lavf57.20.100
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 854x480 [SAR 1280:1281 DAR 16:9], q=-1--1, 23.98 fps, 24k tbn, 23.98 tbc (default)
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Metadata:
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] creation_time : 2015-07-14 22:13:20
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] handler_name : Alias Data Handler
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] encoder : Lavc57.19.100 libx264
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Side data:
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] unknown side data type 10 (24 bytes)
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Stream mapping:
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
[Tue Jan 19 17:10:59 2016] [error] [client XXX.XXX.XXX.XXX] Press [q] to stop, [?] for help
[Tue Jan 19 17:11:00 2016] [error] [client XXX.XXX.XXX.XXX] frame= 24 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x \r
[Tue Jan 19 17:11:00 2016] [error] [client XXX.XXX.XXX.XXX] frame= 53 fps= 51 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x \r
[Tue Jan 19 17:11:02 2016] [error] [client XXX.XXX.XXX.XXX] frame= 62 fps= 25 q=29.0 size= 75kB time=00:00:00.00 bitrate=N/A speed= 0x \r
[Tue Jan 19 17:11:02 2016] [error] [client XXX.XXX.XXX.XXX] frame= 68 fps= 20 q=29.0 size= 90kB time=00:00:00.25 bitrate=2946.8kbits/s speed=0.0745x \r
[Tue Jan 19 17:11:03 2016] [error] [client XXX.XXX.XXX.XXX] frame= 74 fps= 18 q=29.0 size= 103kB time=00:00:00.50 bitrate=1689.9kbits/s speed=0.12x \r
[Tue Jan 19 17:11:04 2016] [error] [client XXX.XXX.XXX.XXX] frame= 80 fps= 16 q=29.0 size= 115kB time=00:00:00.75 bitrate=1258.5kbits/s speed=0.148x \r
[Tue Jan 19 17:11:05 2016] [error] [client XXX.XXX.XXX.XXX] frame= 86 fps= 15 q=29.0 size= 128kB time=00:00:01.00 bitrate=1049.4kbits/s speed=0.175x \r
[Tue Jan 19 17:11:05 2016] [error] [client XXX.XXX.XXX.XXX] frame= 92 fps= 15 q=29.0 size= 140kB time=00:00:01.25 bitrate= 917.2kbits/s speed=0.201x \r
[Tue Jan 19 17:11:06 2016] [error] [client XXX.XXX.XXX.XXX] frame= 94 fps= 14 q=29.0 size= 146kB time=00:00:01.33 bitrate= 895.4kbits/s speed=0.196x \r
[Tue Jan 19 17:11:07 2016] [error] [client XXX.XXX.XXX.XXX] frame= 100 fps= 13 q=29.0 size= 158kB time=00:00:01.58 bitrate= 816.6kbits/s speed=0.211x \r
【问题讨论】：
-
附加
&> /dev/null应该可以工作。它是否使工作立即返回
标签： php ffmpeg shell-exec error-log