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• HTML5 / and live transcoding with FFMPEG

  8 mai 2014, par TooTallNate

  So from my web server, I would like to use FFMPEG to transcode a media file for use with an HTML <audio></audio> or <video></video> tag. Easy enough right ?

  The conversion would need to take place in real-time, when an HTTP client requested the converted file. Ideally the file would be streamed back to the HTTP client as it is being transcoded (and not afterwards at the end, since that would potentially take a while before any data starts being sent back).

  This would be fine, except that in today’s browsers, an HTML5 audio or video tag requests the media file in multiple HTTP requests with the Range header. See this question for details.

  In that question linked above, you can see that Safari requests weird chunks of the file, including the ending few bytes. This poses a problem in that the web server WOULD have to wait for the conversion to finish, in order to deliver the final bytes of the file to conform to the Range request.

  So my question is, is my train of thought right ? Is there a better way to deliver transcoding content to an <audio></audio> or <video></video> tag that wouldn’t involve waiting for the entire conversion to finish ? Thanks in advance !

• video hosting with PHP api or PHP script for social network project

  17 avril 2014, par al404IT

  I have a project for a small social network where user can upload their videos, video should not be longer than 1 or 2 minutes but they need to be private and related to user that uploaded.

  Since uploaded video may be in many different format I have two options :

  • upload video and use ffmpeg to process them, can i find any PHP script that does that ? PROS I have my files on my server and I'm not dependent from third party CONS I guess is a real intensive task and I may need a quite good noting plan since the beginning of this project

  • use a video hosting service that provide API to upload and process video, i actually find vzaar.com that may seems to do what I need. PROS Scalable CONS I rely on third party for my contents

  since the project is a small social network it may be interesting this too opusphp.com, but i never user or read about

  can Vimeo PRO suite my needs ? Other suggestions ?
  In future it may be necessary to add a basic video editing function to trim uploaded video setting starting and ending point

• How to show a watermark for 3 second on a MP4 using FFmpeg

  6 février 2014, par b1izzard

  I need to add a 3-second watermark to a Camera recorded video in Android. I'm using FFmpeg static build to execute the commands.

  Approach I

  I had tried the below command using latest version of FFmpeg(version N-60108-gda25a65) in my Desktop running Linux Mint, the command works fine.

  ffmpeg -y -itsoffset 3 -i input.mp4 -i myImage.jpg -filter_complex "[0:v][1:v]overlay=0:0:enable=between(t\,0\,3)"  -codec:a copy output.mp4

  In Android I'm using the FFmpegv1.2 with below config to execute the command.

   *******Starting FFMPEG
  
      ***ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers***
  
      ***  built on Mar 31 2013 23:44:57 with gcc 4.6 (GCC) 20120106 (prerelease)***
  
      ***  configuration: --arch=arm --target-os=linux --enable-runtime-cpudetect --enable-pic --disable-shared --enable-static --cross-prefix=/opt/android-ndk-r8e/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi- --sysroot=/opt/android-ndk-r8e/platforms/android-8/arch-arm --extra-cflags='-march=armv6' --extra-ldflags= --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network***
  
      ***  libavutil      52. 18.100 / 52. 18.100***
  
      ***  libavcodec     54. 92.100 / 54. 92.100***
  
      ***  libavformat    54. 63.104 / 54. 63.104***
  
      ***  libavdevice    54.  3.103 / 54.  3.103***
  
      ***  libavfilter     3. 42.103 /  3. 42.103***
  
      ***  libswscale      2.  2.100 /  2.  2.100***
  
      ***  libswresample   0. 17.102 /  0. 17.102***

  Java Code to run the FFmpeg command :

  String[] ffmpegCommandToAddWatermark = { 
  
              mFfmpegInstallPath, "-y", "-itsoffset","3",
  
               "-i", INPUT_VIDEO_PATH, "-i", WATERMARK_IMAGE_PATH,
  
               "-filter_complex","[0:v][1:v]overlay=0:0:between(t\\,0\\,3)",
  
               "-strict","-2",
  
               "-codec:a","copy",OUTPUT_VIDEO_PATH};          
  
          try {
  
          Process ffmpegProcess = new ProcessBuilder(ffmpegCommandToAddWatermark)
  
              .redirectErrorStream(true).start();
  
  
  
          String line;
  
  
  
          BufferedReader reader = new BufferedReader(
  
              new InputStreamReader(ffmpegProcess.getInputStream()));
  
          Log.d(TAG, "*******Starting FFMPEG");
  
          while ((line = reader.readLine()) != null ) {
  
  
  
              Log.d(TAG, "***" + line + "***");
  
          }
  
          Log.d(null, "****ending FFMPEG****");
  
  
  
          } catch (Exception e) {
  
          e.printStackTrace();
  
          }

  The command execution failed with following error :

  ***[overlay @ 0x271f770] No option name near 'between(t,0,3)'***
  
  ***[AVFilterGraph @ 0x2711530] Error initializing filter 'overlay' with args '0:0:between(t,0,3)'***
  
  ***Error configuring filters.***

  The same command executes successfully when :enable=between(t\,0\,3) is removed, but the resulting output video has the watermark throughout the timeline, but I need watermark only for the starting 3 seconds.

  Approach II :

  I tried to convert WaterMarkImage to WaterMarkVideo

  ffmpeg -y -loop 1 -r 30 -i WaterMarkImage.jpg -b:v "4096k" -vf "scale=640:480" -t 3 WaterMarkVideo.mp4

  And then merge the WaterMarkVideo.mp4+CameraRecordedVideo.mp4 using the concat command :

  ffmpeg -y -f concat -i inputs.txt -c copy output.mp4

  The resulting output is corrupt due to BitRate,FrameRate,etc., mismatch. Any idea to solve the problem ?.