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• Streaming video from an image using FFMPEG on Windows

  26 mai 2013, par Daniel Zohar

  I wrote a program that simulates a camera and converts the output into a video stream. The program is required to be able to run on Windows.
  There are two components in the system :

  1. Camera Simulator. A C++ program that simulates the camera. It copies a pre-generated frame (i.e. PNG file) every 0.1 seconds, using the windows copy command, to a destination path ./target/target_image.png
  2. Video Stream. Using FFmpeg, it creates a video stream out of the copied images. FFmpeg is ran with the following command :
     ffmpeg -loop 1 -i ./target/target_image.png -r 10 -vcodec mpeg4 -f mpegts udp://127.0.0.1:1234

  When running the whole thing together, it works fine for a few seconds until the ffmpeg halts. Here is a log while running in debug mode :

  ffmpeg version N-52458-gaa96439 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr 24 2013 22:19:32 with gcc 4.8.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 27.101 / 52. 27.101
  
    libavcodec     55.  6.100 / 55.  6.100
  
    libavformat    55.  3.100 / 55.  3.100
  
    libavdevice    55.  0.100 / 55.  0.100
  
    libavfilter     3. 60.101 /  3. 60.101
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Splitting the commandline.
  
  Reading option '-loop' ... matched as AVOption 'loop' with argument '1'.
  
  Reading option '-i' ... matched as input file with argument './target/target_image.png'.
  
  Reading option '-r' ... matched as option 'r' (set frame rate (Hz value, fraction or abbreviation)) with argument '10'.
  
  Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'mpeg4'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'mpegts'.
  
  Reading option 'udp://127.0.0.1:1234' ... matched as output file.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file ./target/target_image.png.
  
  Successfully parsed a group of options.
  
  Opening an input file: ./target/target_image.png.
  
  [AVIOContext @ 02678840] Statistics: 234307 bytes read, 0 seeks
  
  [AVIOContext @ 02678840] Statistics: 221345 bytes read, 0 seeks
  
      Last message repeated 1 times
  
  [AVIOContext @ 02678840] Statistics: 226329 bytes read, 0 seeks
  
      Last message repeated 2 times
  
  [AVIOContext @ 02678840] Statistics: 228676 bytes read, 0 seeks
  
      Last message repeated 2 times
  
  [AVIOContext @ 02678840] Statistics: 230685 bytes read, 0 seeks
  
      Last message repeated 2 times
  
  [AVIOContext @ 02678840] Statistics: 232697 bytes read, 0 seeks
  
      Last message repeated 5 times
  
  [AVIOContext @ 02678840] Statistics: 234900 bytes read, 0 seeks
  
      Last message repeated 2 times
  
  [AVIOContext @ 02678840] Statistics: 236847 bytes read, 0 seeks
  
  [image2 @ 02677ac0] Probe buffer size limit of 5000000 bytes reached
  
  Input #0, image2, from './target/target_image.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0, 22, 1/25: Video: png, rgb24, 1274x772 [SAR 1:1 DAR 637:386], 1/25, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Successfully opened the file.
  
  Parsing a group of options: output file udp://127.0.0.1:1234.
  
  Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 10.
  
  Applying option vcodec (force video codec ('copy' to copy stream)) with argument mpeg4.
  
  Applying option f (force format) with argument mpegts.
  
  Successfully parsed a group of options.
  
  Opening an output file: udp://127.0.0.1:1234.
  
  Successfully opened the file.
  
  [graph 0 input from stream 0:0 @ 02769280] Setting 'video_size' to value '1274x772'
  
  [graph 0 input from stream 0:0 @ 02769280] Setting 'pix_fmt' to value '2'
  
  [graph 0 input from stream 0:0 @ 02769280] Setting 'time_base' to value '1/25'
  
  [graph 0 input from stream 0:0 @ 02769280] Setting 'pixel_aspect' to value '1/1'
  
  [graph 0 input from stream 0:0 @ 02769280] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 02769280] Setting 'frame_rate' to value '25/1'
  
  [graph 0 input from stream 0:0 @ 02769280] w:1274 h:772 pixfmt:rgb24 tb:1/25 fr:25/1 sar:1/1 sws_param:flags=2
  
  [format @ 02768ba0] compat: called with args=[yuv420p]
  
  [format @ 02768ba0] Setting 'pix_fmts' to value 'yuv420p'
  
  [auto-inserted scaler 0 @ 02768740] Setting 'w' to value '0'
  
  [auto-inserted scaler 0 @ 02768740] Setting 'h' to value '0'
  
  [auto-inserted scaler 0 @ 02768740] Setting 'flags' to value '0x4'
  
  [auto-inserted scaler 0 @ 02768740] w:0 h:0 flags:'0x4' interl:0
  
  [format @ 02768ba0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [AVFilterGraph @ 026772c0] query_formats: 4 queried, 3 merged, 1 already done, 0 delayed
  
  [auto-inserted scaler 0 @ 02768740] w:1274 h:772 fmt:rgb24 sar:1/1 -> w:1274 h:772 fmt:yuv420p sar:1/1 flags:0x4
  
  [mpeg4 @ 02785020] detected 4 logical cores
  
  [mpeg4 @ 02785020] intra_quant_bias = 0 inter_quant_bias = -64
  
  [mpegts @ 0277da40] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, mpegts, to 'udp://127.0.0.1:1234':
  
    Metadata:
  
      encoder         : Lavf55.3.100
  
      Stream #0:0, 0, 1/90000: Video: mpeg4, yuv420p, 1274x772 [SAR 1:1 DAR 637:386], 1/10, q=2-31, 200 kb/s, 90k tbn, 10 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  *** drop!
  
      Last message repeated 10 times
  
  frame=   11 fps=0.0 q=4.0 size=     118kB time=00:00:01.10 bitrate= 875.1kbits/s dup=0 drop=11    
  
  Statistics: 242771 bytes read, 0 seeks
  
  [AVIOContext @ 02674a60] Statistics: 246525 bytes read, 0 seeks
  
  *** drop!
  
  [AVIOContext @ 02674a60] Statistics: 230678 bytes read, 0 seeks
  
  [AVIOContext @ 02674a60] Statistics: 244023 bytes read, 0 seeks
  
  *** drop!
  
  [AVIOContext @ 02674a60] Statistics: 246389 bytes read, 0 seeks
  
  
  
  *** drop!
  
  [AVIOContext @ 02674a60] Statistics: 224478 bytes read, 0 seeks
  
  [AVIOContext @ 02674a60] Statistics: 228013 bytes read, 0 seeks
  
  *** drop!
  
  [image2 @ 02677ac0] Could not open file : ./target/target_image.png
  
  ./target/target_image.png: Input/output error
  
  [output stream 0:0 @ 02768c20] EOF on sink link output stream 0:0:default.
  
  No more output streams to write to, finishing.
  
  frame=  164 fps= 17 q=31.0 Lsize=     959kB time=00:00:16.40 bitrate= 478.9kbits/s dup=0 drop=240    
  
  
  
  video:869kB audio:0kB subtitle:0 global headers:0kB muxing overhead 10.285235%
  
  404 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 026779c0] Statistics: 0 seeks, 746 writeouts

  It seems to me there's some kind of collision between the reading and writing to/from the same file. What's also interesting is that on Linux (while replacing the copy with cp) the program works just fine.

  Can someone suggest a way to solve this issue ? Alternatives solutions are also acceptable as long as the logical workflow remains the same.

• task scheduler windows wampserver [closed]

  6 mai 2013, par user2321982

  well I've been researching task scheduler, I found the cron to linux, I wonder if it has any windows.
  I want to run a script in php every 15 seconds, which is the case in video conversion, and if I was to convert the video to wait over, eg a row, 5 conversions maximum
  The script uses a function videoscreen up and calls the command prompt to convert.

• PHP/ffmpeg (Windows 7) : - Permission Denied. Tried everything, but still doesn't work

  27 octobre 2014, par user365465

  I have a command-line PHP script that, when given the folder name as an argument when executing the script, will find all images in said folder and resize them using FFmpeg. Problem is, I always get a Permission Denied error in FFmpeg when it attempts to get at the files within the folder. This is while being on Windows 7.

  The big problem is that I’ve tried every solution that keeps popping up on the interwebs when I search for how to fix it. I’ve changed the settings in Avast !, did the attrib command (both as normal and "Run as Administrator") to unmark as read-only, took ownership of the folder both via command line and using that GUI takeown context menu thing everyone keeps throwing around (obviously before my efforts to mark everything as not-read-only), messed with permissions, everything. I keep searching and searching for a solution, but all of the sites keep throwing out the same things over and over again - things that I’ve already tried multiple times. I’m at the end of my rope here. All I want to do is resize images quickly and automatically so I can put them up on my website, yet this has been a massive headache...

  Please help me ! :(

  Update (Additional Points) :

  • The error is through FFmpeg, not PHP. FFmpeg spits out the permission denied error, the script just continues doing what it does normally (or, at least, it would if it weren’t for my die statement that kicks in in the event of FFmpeg failing).

  • FFmpeg will execute just fine if it’s run normally through the command line instead of through the script. However, this does not help the problem of me having to resize hundreds of photos by hand !

  • I’m just running this script in the normal terminal using the CLI engine. Weird use for PHP, I know, but since I already knew how to work with FFmpeg in PHP (but in Linux !) so I figured I might as well use the code as a normal, stand-alone program...

  • FFmpeg spits out the same error regardless of which PHP function is used to execute it. It happens for shell_exec, exec, passthru, and system.