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• How to debug ffmpeg reliability for long running rtsp streams

  13 septembre 2022, par Mark

  I have a long running ffmpeg background process that "watches" an rtsp stream and takes snapshots every 7 minutes.

  


  It's being run like this

  


  C:\Windows\System32\cmd.exe /c C:\ffmpeg\bin\ffmpeg.exe -nostdin -rtsp_transport tcp -y -timeout 5000000 -i rtsp://someurl -q:v 1 -an -vf fps=0.002381,scale="1280:720" -strftime 1 -f image2 C:\somelocalfolder\%Y-%m-%d_%H-%M-%S.jpg > c:\ffmpeglog.txt 2>&1


  


  This process runs for days but intermittently, for hours at a time, seems to miss taking snapshots, until eventually it starts to take them again - then fail again, etc. The logs at info level are not helpful. I checked the stream during times when it was not taking snapshots and the stream was up. What's happening here ? How can I debug this ?

  


  Below is an image of succesfull snapshots per hour. There should always be between 8 and 9.


  


  Logs look like this

  


      ffmpeg version 2022-03-31-git-e301a24fa1-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 11.2.0 (Rev7, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57. 24.101 / 57. 24.101
  libavcodec     59. 25.100 / 59. 25.100
  libavformat    59. 20.101 / 59. 20.101
  libavdevice    59.  6.100 / 59.  6.100
  libavfilter     8. 29.100 /  8. 29.100
  libswscale      6.  6.100 /  6.  6.100
  libswresample   4.  6.100 /  4.  6.100
  libpostproc    56.  5.100 / 56.  5.100
Input #0, rtsp, from 'rtsp://somerul':
  Metadata:
    title           : HIK Media Server V4.21.005
    comment         : HIK Media Server Session Description : standard
  Duration: N/A, start: 0.033000, bitrate: N/A
  Stream #0:0: Video: h264 (High), yuv420p(progressive), 704x576, 30 tbr, 90k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
[swscaler @ 000002a1c2c20680] [swscaler @ 000002a1c2c2e0c0] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 000002a1c2c20680] [swscaler @ 000002a1c2c67c40] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 000002a1c2c20680] [swscaler @ 000002a1c2cc6700] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'C:\somelocalfolder\Temp\stream_2\StreamedImages\%Y-%m-%d_%H-%M-%S.jpg':
  Metadata:
    title           : HIK Media Server V4.21.005
    comment         : HIK Media Server Session Description : standard
    encoder         : Lavf59.20.101
  Stream #0:0: Video: mjpeg, yuvj420p(pc, progressive), 1280x720, q=2-31, 200 kb/s, 0.0024 fps, 0.0024 tbn
    Metadata:
      encoder         : Lavc59.25.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed=   0x   


  


  Update
I got some trace logs. The ffmpeg seems to fail silently at some point and stop taking snapshots.

  


  After about 3 million log lines (which is really only a couple of hours in my case) I get the following

  


  rtsp://192.168.15.195:554/streaming/channels/904: Unknown error


  


  But ffmpeg silently continues. Here is a bit more of the log

  


      [Parsed_fps_0 @ 00000248e7d50e40] Read frame with in pts 1074443040, out pts 28
[Parsed_fps_0 @ 00000248e7d50e40] Dropping frame with pts 28
frame=   28 fps=0.0 q=1.0 size=N/A time=03:08:59.77 bitrate=N/A speed=0.95x    
[rtsp @ 00000248e765cf00] tcp_read_packet:
[h264 @ 00000248e7d59880] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 3
[rtsp @ 00000248e765cf00] ret=-138 c=24 [$]
rtsp://192.168.15.195:554/streaming/channels/904: Unknown error
[Parsed_fps_0 @ 00000248e7d50e40] Read frame with in pts 1074446100, out pts 28
[Parsed_fps_0 @ 00000248e7d50e40] Dropping frame with pts 28
frame=   28 fps=0.0 q=1.0 size=N/A time=03:08:59.77 bitrate=N/A speed=0.95x    
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=696
[rtsp @ 00000248e765cf00] Sending:
GET_PARAMETER rtsp://192.168.15.195:554/streaming/channels/904 RTSP/1.0

CSeq: 402

User-Agent: Lavf59.20.101

Session: 931848797

Authorization: Digest username="******", realm="709382dda4ccb674edf093d3", nonce="13fca62fc", uri="rtsp://192.168.15.195:554/streaming/channels/904", response="74341df9611f0ac3dc247b402424735b", algorithm="MD5"



--
[NULL @ 00000248e7662640] nal_unit_type: 7(SPS), nal_ref_idc: 3
[NULL @ 00000248e7662640] nal_unit_type: 8(PPS), nal_ref_idc: 3
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=756
[Parsed_fps_0 @ 00000248e7d50e40] Read frame with in pts 1074449070, out pts 28
[Parsed_fps_0 @ 00000248e7d50e40] Dropping frame with pts 28
[Parsed_fps_0 @ 00000248e7d50e40] Read frame with in pts 1074449070, out pts 28
[Parsed_fps_0 @ 00000248e7d50e40] Dropping frame with pts 28
frame=   28 fps=0.0 q=1.0 size=N/A time=03:08:59.77 bitrate=N/A speed=0.949x    
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1352
frame=   28 fps=0.0 q=1.0 size=N/A time=03:08:59.77 bitrate=N/A speed=0.949x    
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1352
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1352
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1352
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1228
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1352
[NULL @ 00000248e7662640] reference count 1 overflow
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=804
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=1352
[NULL @ 00000248e7662640] illegal memory management control operation 11
[rtsp @ 00000248e765cf00] tcp_read_packet:
[rtsp @ 00000248e765cf00] ret=1 c=24 [$]
[rtsp @ 00000248e765cf00] id=0 len=836


  


  Basically it appears an issue of ffmpeg silently failing. If it crashed, my software could detect it and I could rerun it, but if it fails silently like this, I need another solution.

  


• FFMPEG & ytdl-core | Muxing highestaudio and highestvideo results in mp4 with incorrect time

  17 mars 2023, par Niek Peters

  I want to combine a file with only video and a file with only audio from the ytdl-core package into a mp4 and stream it in the response. I get the files using the highestvideo and highestaudio quality settings. I tried to modify a part of the ytdl-core-muxer module to change the output format to mp4, for which I also needed to add -movflags frag_keyframe+empty_moov, to allow the output mp4 to be seekable. This all seems to work and it produces a mp4 file without errors. When I open it with the Windows Photos app however, I noticed that even though video plays normally in perfect quality, the time is completely wrong.

  


  As you can see, the time says there are 53 million hours remaining, even though the video is 1:32 mins long

  


  I have tried adding a fixed framerate with -r 60 and regenerating the timestamps with -fflags +genpts, but to no avail. I have also tried encoding the video and audio formats to h264 (using libx264) and acc, but that didn't solve it either.

  


  


  


  // create the ffmpeg process for muxing
const ffmpegProcess = cp.spawn(
  ffmpeg,
  [
    // input audio by pipe
    "-thread_queue_size", "4096",
    "-i", "pipe:3",

    // input video by pipe
    "-thread_queue_size", "4096",
    "-r", "60",
    "-i", "pipe:4",

    // map audio and video correspondingly
    "-map", "0:a",
    "-map", "1:v",

    // change the codec
    "-c:v", "libx264", 
    "-c:a", "aac",
        
    "-preset", "ultrafast",

    // Allow output to be seekable, which is needed for mp4 output
    "-movflags", "frag_keyframe+empty_moov",

    // output mp4 and pipe
    "-r", "60",
    "-fflags", "+genpts",
    "-f", "mp4", "pipe:5",
  ],
  {
    // no popup window for Windows users
    windowsHide: true,
    stdio: [
      // silence stdin/out, forward stderr,
      "inherit", "inherit", "inherit",
      // and pipe audio, video, output
      "pipe", "pipe", "pipe",
    ],
  }
);
audioStream.pipe(ffmpegProcess.stdio[3]);
videoStream.pipe(ffmpegProcess.stdio[4]);
ffmpegProcess.stdio[5].pipe(result);

  


  


  



  Full console output :

  


  ffmpeg version 5.0.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers        
  built with gcc 11.2.0 (Rev7, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp 
--enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx 
--enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:3':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-08-21T19:56:49.000000Z
  Duration: 00:01:32.11, start: 0.000000, bitrate: N/A
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], 1892 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      creation_time   : 2022-08-21T19:56:49.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 08/21/2022.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)    Metadata:
      creation_time   : 2022-08-21T19:56:49.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 08/21/2022.
      vendor_id       : [0][0][0][0]
Input #1, matroska,webm, from 'pipe:4':
  Metadata:
    encoder         : google/video-file
  Duration: 00:01:32.12, start: 0.000000, bitrate: N/A
  Stream #1:0(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709), 3840x2160, SAR 1:1 DAR 16:9, 60 fps, 60 
tbr, 1k tbn (default)
Stream mapping:
  Stream #0:1 -> #0:0 (aac (native) -> aac (native))
  Stream #1:0 -> #0:1 (vp9 (native) -> h264 (libx264))
[libx264 @ 0000022aa059be80] using SAR=1/1
[libx264 @ 0000022aa059be80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2      
[libx264 @ 0000022aa059be80] profile Constrained Baseline, level 5.2, 4:2:0, 8-bit
[libx264 @ 0000022aa059be80] 264 - core 164 r3094 bfc87b7 - H.264/MPEG-4 AVC codec - Copyleft 2003-2022 
- http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to 'pipe:5':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf59.16.100
  Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)     
    Metadata:
      creation_time   : 2022-08-21T19:56:49.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 08/21/2022.
      vendor_id       : [0][0][0][0]
      encoder         : Lavc59.18.100 aac
  Stream #0:1(eng): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 15360 tbn (default)
    Metadata:
      encoder         : Lavc59.18.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
[matroska,webm @ 0000022aa056cd00] Thread message queue blocking; consider raising the thread_queue_size option (current value: 4096)
frame= 5527 fps= 77 q=-1.0 Lsize=  424599kB time=00:01:32.11 bitrate=37761.2kbits/s speed=1.29x    
video:423226kB audio:1329kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.010570%[aac @ 0000022aa05ca240] Qavg: 17828.035
[libx264 @ 0000022aa059be80] frame I:23    Avg QP:19.83  size:292044
[libx264 @ 0000022aa059be80] frame P:5504  Avg QP:22.92  size: 77519
[libx264 @ 0000022aa059be80] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0000022aa059be80] mb P  I16..4: 26.5%  0.0%  0.0%  P16..4: 14.1%  0.0%  0.0%  0.0%  0.0%    skip:59.3%
[libx264 @ 0000022aa059be80] coded y,uvDC,uvAC intra: 10.6% 27.6% 7.0% inter: 6.5% 12.8% 1.4%
[libx264 @ 0000022aa059be80] i16 v,h,dc,p: 57% 26%  8%  9%
[libx264 @ 0000022aa059be80] i8c dc,h,v,p: 43% 24% 25%  7%
[libx264 @ 0000022aa059be80] kb/s:37637.70


  


• FFMPEG With PHP Upload

  27 décembre 2014, par Will S.

  I’ve created an upload form that uses Ajax to dynamically upload image files to my webserver, and then uses shell_exec and ffmpeg to resize the images (and convert them to jpg, if they are already the correct size), and then save the resulting file. I’m getting really strange behaviour with it. It works about 50% of the time (so far I’ve only tested with JPG and PNG files). Whenever it fails, I get this results :

  ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Dec 23 2014 16:55:38 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: 
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  /tmp/phpU0pnje: Invalid data found when processing input

  Here’s the PHP code :

  if ($file_info[0] == 'image'){
  
          $image_info = getimagesize($_FILES['upload_media_hidden']['tmp_name'][$i]);
  
          $longest_edge = ($image_info[0] > $image_info[1]) ? $image_info[0] : $image_info[1];
  
          $aspect_ratio = $image_info[0]/$image_info[1];
  
          $aspect_ratio_s = ($image_info[0] > $image_info[1]) ? '200x' . (int)(200/$aspect_ratio) : (int)(200*$aspect_ratio) . 'x200';
  
          $aspect_ratio_m = ($image_info[0] > $image_info[1]) ? '400x' . (int)(400/$aspect_ratio) : (int)(400*$aspect_ratio) . 'x400';
  
          $aspect_ratio_l = ($image_info[0] > $image_info[1]) ? '700x' . (int)(700/$aspect_ratio) : (int)(700*$aspect_ratio) . 'x700';
  
  
  
          if ($longest_edge > 200){
  
                  $file_s = shell_exec('ffmpeg -i ' . escapeshellarg($_FILES['upload_media_hidden']['tmp_name'][$i]) . ' -f image2 -s ' . $aspect_ratio_s . ' - 2>&1');
  
          }
  
  
  
        ................more processing below

  So the ffmpeg command essentially looks like this :

  ffmpeg -i ’SOMEFILE.jpg’ -f image2 -s 400x200 -

  When I run that command in bash to the actual file (not the temporary file when I upload it to my form), it works fine. I’m guessing the issue is with the pipe, but I’m not sure. Any ideas ?

  Thanks !

  Update :
  When I run this code :

  if ($file_info[0] == 'image'){
  
          $image_info = getimagesize($_FILES['upload_media_hidden']['tmp_name'][$i]);
  
          $longest_edge = ($image_info[0] > $image_info[1]) ? $image_info[0] : $image_info[1];
  
          $aspect_ratio = $image_info[0]/$image_info[1];
  
          $aspect_ratio_s = ($image_info[0] > $image_info[1]) ? '200x' . (int)(200/$aspect_ratio) : (int)(200*$aspect_ratio) . 'x200';
  
          $aspect_ratio_m = ($image_info[0] > $image_info[1]) ? '400x' . (int)(400/$aspect_ratio) : (int)(400*$aspect_ratio) . 'x400';
  
          $aspect_ratio_l = ($image_info[0] > $image_info[1]) ? '700x' . (int)(700/$aspect_ratio) : (int)(700*$aspect_ratio) . 'x700';
  
  
  
          if ($longest_edge > 200){
  
                  move_uploaded_file($_FILES['upload_media_hidden']['tmp_name'][$i],'/tmp/TEST.jpg');
  
                  system('ffmpeg -i /tmp/TEST.jpg -f image2 -s ' . $aspect_ratio_s . ' - 2>&1');
  
  
  
                  $file_s = system('ffmpeg -i ' . escapeshellarg($_FILES['upload_media_hidden']['tmp_name'][$i]) . ' -f image2 -s ' . $aspect_ratio_s . ' - 2>&1');

  I get this result from php :

  ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Dec 23 2014 16:55:38 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: 
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  Input #0, image2, from '/tmp/TEST.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 54530 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1024x1432 [SAR 1:1 DAR 128:179], 25 tbr, 25 tbn, 25 tbc
  
  [swscaler @ 0x2bce0c0] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf56.15.102
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc), 143x200 [SAR 25600:25597 DAR 128:179], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc56.13.100 mjpeg
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  �����JFIF��d�c������Lavc56.13.100����C�     
  
  ----FILE OUTPUT...edited out for clarity---
  
  ���frame=    1 fps=0.0 q=3.7 Lsize=N/A time=00:00:00.04 bitrate=N/A    
  
  video:5kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:     unknown
  
  ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Dec 23 2014 16:55:38 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: 
  
    libavutil      54. 15.100 / 54. 15.100
  
    libavcodec     56. 13.100 / 56. 13.100
  
    libavformat    56. 15.102 / 56. 15.102
  
    libavdevice    56.  3.100 / 56.  3.100
  
    libavfilter     5.  2.103 /  5.  2.103
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
  /tmp/phpxqYzHN: No such file or directory
  
  /tmp/phpxqYzHN: No such file or directory

  So it seems to work if I move the file first ? It’s really important that I don’t have any extra disk io, so this solution wouldn’t be acceptable...

  SOLUTION :
  So the problem was that ffmpeg was not able to recognize the input file type, since PHP’s tmp files don’t end with an extension (seems like a bug that ffmpeg looks at the extension rather than the internal mime type/headers). The solution was that I needed to add "-f image2" to the beginning of my command, so it ended up looking something like this :

  ffmpeg -f image2 -i '/tmp/PHP_TMP_FILE' -f image2 -s 400x200 -

  Hopefully this will save someone the many hours it took me to figure this out...