我查看了类似的问题，但那里的解决方案不适用于我的情况。有人有什么想法吗？我正在尝试从给定的视频文件中捕获缩略图。
后来，我的目标是从实时流媒体视频文件中捕获缩略图。
下面是我目前的设置。
Linux Ubuntu 16.04
PHP 版本 7.0
Nginx 版本 1.10.3
FFmpeg 版本 FFmpeg 2.8.11
我在我的 Ubuntu 服务器中通过以下命令安装了 FFmpeg。
apt-get update
apt-get install ffmpeg
当我在终端中键入以下命令行时，它可以很好地进行转换。
ffmpeg -i /etc/nginx/html/test.mp4 -ss 00:00:01 -vframes 1 -vf scale=240:120 /etc/nginx/html/Share/ffmpeg/thumbnails/test.png;
为了在 php 文件中使用它，我通过在终端中输入
which ffmpeg 来确认 ffmpeg 二进制文件的位置。 , 它返回 /usr/bin/ffmpeg我还通过使用
chmod 755 授予目录权限命令行。这是我的 ffmpeg.php 文件中的内容。
如您所见，我包含了我的 ffmpeg 的完整路径。
<?php
header("Content-Type: text/html;charset=UTF-8");
$ffmpeg = "/usr/bin/ffmpeg";
$videoFile="/etc/nginx/html/test.mp4";
$thumbnail= "/etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg";
$cmd = "$ffmpeg -i $videoFile -ss 00:00:01 -vframes 1 -vf scale=240:120 $thumbnail 2>&1 &";
$output = shell_exec($cmd);
echo "<pre>".$output."</pre>";
?>
这将返回如下消息。
ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/etc/nginx/html/Share/test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
creation_time : 1970-01-01 00:00:00
encoder : Lavf53.24.2
Duration: 00:00:06.40, start: 0.000000, bitrate: 1321 kb/s
Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 932 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : SoundHandler
[swscaler @ 0x1621be0] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to '/etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf56.40.101
Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 240x120 [SAR 20:23 DAR 40:23], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
encoder : Lavc56.60.100 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[image2 @ 0x16165a0] Could not open file : /etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg
av_interleaved_write_frame(): Input/output error
frame= 1 fps=0.0 q=3.9 Lsize=N/A time=00:00:00.04 bitrate=N/A
video:8kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!
更新:我还通过 chmod +x $(which ffmpeg) 允许 ffmpeg
我试过
php /etc/nginx/html/Share/ffmpeg/ffmpeg.php在终端中，它也可以很好地转换。 libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/etc/nginx/html/Share/test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
creation_time : 1970-01-01 00:00:00
encoder : Lavf53.24.2
Duration: 00:00:06.40, start: 0.000000, bitrate: 1321 kb/s
Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 932 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : SoundHandler
[swscaler @ 0x72dbe0] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to '/etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail.jpg':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2mp41
encoder : Lavf56.40.101
Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 240x120 [SAR 20:23 DAR 40:23], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
Metadata:
creation_time : 1970-01-01 00:00:00
handler_name : VideoHandler
encoder : Lavc56.60.100 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
Press [q] to stop, [?] for help
frame= 1 fps=0.0 q=3.9 Lsize=N/A time=00:00:00.04 bitrate=N/A
video:8kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
最佳答案
您似乎没有该目录的正确权限/etc/nginx/html/Share/ffmpeg/thumbnails/
至少，这是我从错误消息 Could not open file : /etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg 中得到的。 .
如果这是问题的原因，一种快速而肮脏的测试方法是将目录权限级别更改为 777。(当然之后恢复)
关于php - FFmpeg(来自视频的缩略图)在命令行中有效，但在 PHP 脚本中无效，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42550426/