FFmpeg（视频缩略图）在命令行中运行，但在PHP脚本中不起作用

Question

I looked at the similar questions, and the solutions there do not work in my case. Anyone has any idea? I am trying to capture a thumbnail from a given video file.

Later, my goal is to capture a thumbnail from live streaming video file.

Below is my current set up.

Linux Ubuntu 16.04

PHP version 7.0

Nginx Version 1.10.3

FFmpeg Version FFmpeg 2.8.11

I installed FFmpeg through below commands in my Ubuntu server.

apt-get update
apt-get install ffmpeg

When I type the below command line in the terminal, it does the conversion fine.

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;

In order to use it in php file, I confirmed the location of ffmpeg binaries by I typing in the terminal, which ffmpeg , and it returns /usr/bin/ffmpeg

I also gave permission to the directory by using chmod 755 command line.

Here is what I have in my ffmpeg.php file. I included the full path to my ffmpeg as you can see.

<?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>";
?>

This returns the message like below.

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!

UPDATED: I also gave permission to ffmpeg by chmod +x $(which ffmpeg)

I tried php /etc/nginx/html/Share/ffmpeg/ffmpeg.php in the terminal, and it also does conversion fine.

  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

Answer 1

It seems that you don't have the right permissions for the directory
/etc/nginx/html/Share/ffmpeg/thumbnails/

That, at least, is what I get from the error message Could not open file : /etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg .

A quick and dirty way to test, if this is the reason for the problem, would be to change the directories permissions level to 777. (of course revert this afterwards)

Answer 2

I SOLVED the above issue with great help from @Tek and @AtaurRahman.

It was permission issue

I had to execute the chown / chmod commands to the path

chmod -R 777 'path';
chown -R www-data:www-data 'path';

chown command : changes the user and/or group ownership of for given file

chmod command : changes file access permissions (read and write access).

I also had the permission problem for sharing folder with my host operating system.

As you can see my question above, /etc/nginx/html/Share/~ is where

I wanted to write a .jpg file. I gave access read/wrtie to everyone to the sharing folder in my host OS, it works perfectly. (I am not sure if this causes any security issue later on. If anyone knows about this, feel free to comment below to share)

I hope this helps someone who is facing the same problem