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• Video tube site on wordpress dedicated server mp4 only streams on android firefox

  9 mai 2015, par Steven Minix

  I have a video tube site that is quite popular and I am having an issue with my mp4 files streaming on android devices. When using Mozilla Firefox on android my videos play and seek perfectly. When using google chrome or default Android browser they do not play at all. I ran one of my videos through mp4box with a few settings and I got it to play on those browser in Android but they break when trying to seek. So at this stage the videos still play fine on Firefox in Android but now even though the video will start playing rather quickly on the other two browsers the videos will not seek properly as seeking will cause the video to break and restart itself. I am in a wordpress installation on a dedicated server.

  server specs:
  
  PHP 5.2.4 or greater
  
  MySQL 5.0 or greater
  
  PHP cURL extension
  
  PHP Zlib extension
  
  Unix-like OS (Windows is not supported)
  
  PHP 5.3, 5.4, 5.5 yes
  
  IonCube Loader 4.6.1 or above yes
  
  Mysql 5.0 or above and its support in PHP yes
  
  FFmpeg 1.0 or above with libx264, libavfilter and AAC codec (libfaac, libfdk_aac or native ffmpeg aac codec) yes
  
  cURL and its support in PHP yes
  
  Apache + mod_rewrite + (MultiViews option disabled) yes, not sure about multi views, please ask how this is done.
  
  Zlib library yes
  
  XML extension yes
  
  GD2 with true type font (required!) yes
  
  Ability to exec PHP from CLI using exec() command yes
  
  PHP register_globals off yes
  
  PHP magic_quotes_gpc off yes
  
  PHP safe_mode off yes
  
  PHP file_uploads on yes
  
  PHP allow_url_fopen on yes

  The files are MP4 with the meta data at the front of the file and playing in the standard wordpress video player(or any html5 based player as I have tried quite a few and all have the same result)

  I had to ask my server admin to install ffmpeg for my streaming is it possible they did not add the right commands ?

  I have no idea what my videos are doing on Apple devices but I assume it is okay since Google Analytics shows a low bounce rate from that devices.

  If any issue is on service side I want to contact them armed with facts. I appreciate your help in this matter.

  EDIT : FFMPEG SERVER CONFIGURATION :
  root@dwhsv160 [ /ffmpeginstaller.8.0]# ffmpeg -version
  ffmpeg version N-71403-g415f1fa-syslint Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-11)
  configuration : —prefix=/usr/local/cpffmpeg —enable-shared —enable-nonfree —enable-gpl —enable-pthreads —enable-libopencore-amrnb —enable-decoder=liba52 —enable-libopencore-amrwb —enable-libfaac —enable-libmp3lame —enable-libtheora —enable-libvorbis —enable-libx264 —enable-libxvid —extra-cflags=-I/usr/local/cpffmpeg/include/ —extra-ldflags=-L/usr/local/cpffmpeg/lib —enable-version3 —extra-version=syslint
  libavutil 54. 22.101 / 54. 22.101
  libavcodec 56. 34.100 / 56. 34.100
  libavformat 56. 30.100 / 56. 30.100
  libavdevice 56. 4.100 / 56. 4.100
  libavfilter 5. 13.101 / 5. 13.101
  libswscale 3. 1.101 / 3. 1.101
  libswresample 1. 1.100 / 1. 1.100
  libpostproc 53. 3.100 / 53. 3.100

  The few things I tried with the mp4 that got them to play but still not seek properly were running them through mp4box with no special settings and simply remuxing them. I also tried a couple special settings like adding a hint track and other things none resulted in the file streaming properly in chrome or default android browser. AGAIN my files stream fine on all desktops and in FIREFOX on android but DO NOT work in chrome on android or default android browser.

• FFMPEG - Merge mp4 files and audio file

  4 octobre 2016, par Jon Stevens

  I have an ffmpeg that merges 3 mp4 videos and then another command that adds audio to the output file from the first command. The commands are as follows :

  ffmpeg -i vid-1.mp4 -i vid-2.mp4 -i vid-3.mp4 -filter_complex "[0:v][1:v][2:v]concat=n=3:v=1" -preset ultrafast -crf 1 output.mp4
  
  
  
  ffmpeg -i output.mp4 -i audio.mp3 -preset ultrafast -crf 1 final.mp4

  • vid-1.mp4 (does NOT have audio stream)
  • vid-2.mp4 (does NOT have audio stream)

  Is there anyway to do this in one command ? I would like to also add the audio to the video that is getting created in the first command. Is this possible ?

  Console output of "ffmpeg -i vid-1.mp4 -i vid-2.mp4 -i vid-3.mp4 -i audio.mp3"

  [jstevens@jr testing]$ ffmpeg -i vid-1.mp4 -i vid-2.mp4 -i vid-3.mp4 -i audio.mp3
  
  ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 6.1.1 (GCC) 20160510 (Red Hat 6.1.1-2)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-frei0r --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid-1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 1085 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1081 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'vid-2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 1018 kb/s
  
      Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1014 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'vid-3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.25.101
  
    Duration: 00:00:05.00, start: 0.000000, bitrate: 823 kb/s
  
      Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 819 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [mp3 @ 0x1ca30c0] Skipping 0 bytes of junk at 0.
  
  [mp3 @ 0x1ca30c0] Estimating duration from bitrate, this may be inaccurate
  
  Input #3, mp3, from 'audio.mp3':
  
    Duration: 00:00:19.57, start: 0.000000, bitrate: 64 kb/s
  
      Stream #3:0: Audio: mp3, 44100 Hz, mono, s16p, 64 kb/s
  
  At least one output file must be specified

• Extracting each individual frame from an H264 stream for real-time analysis with OpenCV

  11 mars 2020, par exclmtnpt

  Problem Outline

  I have an h264 real-time video stream (I’ll call this "the stream") being captured in Process1. My goal is to extract each frame from the stream as it comes through and use Process2 to analyze it with OpenCV. (Process1 is nodejs, Process2 is Python)

  Things I’ve tried, and their failure modes :

  • Send the stream directly from one Process1 to Process2 over a named fifo pipe :

  I succeeded in directing the stream from Process1 into the pipe. However, in Process2 (which is Python) I could not (a) extract individual frames from the stream, and (b) convert any extracted data from h264 into an OpenCV format (e.g. JPEG, numpy array).

  I had hoped to use OpenCV’s VideoCapture() method, but it does not allow you to pass a FIFO pipe as an input. I was able to use VideoCapture by saving the h264 stream to a .h264 file, and then passing that as the file path. This doesn’t help me, because I need to do my analysis in real time (i.e. I can’t save the stream to a file before reading it in to OpenCV).

  • Pipe the stream from Process1 to FFMPEG, use FFMPEG to change the stream format from h264 to MJPEG, then pipe the output to Process2 :

  I attempted this using the command :

  cat pipeFromProcess1.fifo | ffmpeg -i pipe:0 -f h264 -f mjpeg pipe:1 | cat > pipeToProcess2.fifo

  The biggest issue with this approach is that FFMPEG takes inputs from Process1 until Process1 is killed, and only then does Process2 begin to receive the data.

  Additionally, on the Process2 side, I still don’t understand how to extract individual frames from the data coming over the pipe. I open the pipe for reading (as "f") and then execute data = f.readline(). The size of data varies drastically (some reads have length on the order of 100, others length on the order of 1,000). When I use f.read() instead of f.readline(), the length is much larger, on the order of 100,000.

  If I were to know that I was getting the correct size chunk of data, I would still not know how to transform it into an OpenCV-compatible array because I don’t understand the format it’s coming over in. It’s a string, but when I print it out it looks like this :

  ��_M 0A0����tQ,\%��e���f/�H�#Y�p�f#�Kus�} F����ʳa�G������+$x�%V�� }[����Wo �1’̶A���c����*�&=Z^�o’��Ͽ� SX-ԁ涶V&H|��$
   ��<�E�� ��>�����u���7�����cR� �f�=�9 ��fs�q�ڄߧ�9v�]�Ӷ���& gr]�n�IRܜ�檯����
  � ����+ �I��w�}� ��9�o��� �w��M�m���IJ ��� �m�=�Soՙ}S �>j �,�ƙ�’���tad =i ��WY�FeC֓z �2�g� ;EXX��S��Ҁ*, ���w� _|�&�y��H��=��)� ���Ɗ3@ �h���Ѻ�Ɋ��ZzR`��)�y�� c�ڋ.��v� !u���� �S�I#�$9R�Ԯ0py z ��8 #��A�q�� �͕� ijc �bp=��۹ c SqH

  Converting from base64 doesn’t seem to help. I also tried :

  array = np.fromstring(data, dtype=np.uint8)

  which does convert to an array, but not one of a size that makes sense based on the 640x368x3 dimensions of the frames I’m trying to decode.

  • Using decoders such as Broadway.js to convert the h264 stream :

  These seem to be focused on streaming to a website, and I did not have success trying to re-purpose them for my goal.

  Clarification about what I’m NOT trying to do :

  I’ve found many related questions about streaming h264 video to a website. This is a solved problem, but none of the solutions help me extract individual frames and put them in an OpenCV-compatible format.

  Also, I need to use the extracted frames in real time on a continual basis. So saving each frame as a .jpg is not helpful.

  System Specs

  Raspberry Pi 3 running Raspian Jessie

  Additional Detail

  I’ve tried to generalize the problem I’m having in my question. If it’s useful to know, Process1 is using the node-bebop package to pull down the h264 stream (using drone.getVideoStream()) from a Parrot Bebop 2.0. I tried using the other video stream available through node-bebop (getMjpegStream()). This worked, but was not nearly real-time ; I was getting very intermittent data streams. I’ve entered that specific problem as an Issue in the node-bebop repository.

  Thanks for reading ; I really appreciate any help anyone can give !