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• react native app doesn't load my video which is made by ffmpeg

  10 mars 2023, par yabbee

  I'm working on react native expo project and using expo-av to play video.I'm experimenting on my iphone and it's working almost fine. I copy and paste the sample code on expo av doc and Big Buck Bunny video is loaded successfully and able to play. But, there is a video that can't be played on my app. I have a video which is stored on s3 server. This is the mp4 video made by ffmpeg command on my computer and manually uploaded it on s3. I can download it and play on my machine. But when I try to load that video on my expo app, the video doesn't show up on the component at all. I write video source correctly including https:// but doesn't show up anything. How can i solve this problem ? I'm using expo 48.0.0 , expo-av 13.2.1 and expo-dev-client 2.1.5 now.

  


  Here is the ffmpeg code that I've used to make video. As you can see, I'm making a retro video by overlaying grain effect mp4 video which I downloaded.

  


  ffmpeg -i /Users/yosuke/Desktop/ffmpeg_playground/effects/grainAndFlash.mp4 -i 
{inputFilePath} -filter_complex "[0:a][1:a]amerge[mixedAudio];
[0]format=rgba,colorchannelmixer=aa=0.25[fg];[1][fg]overlay[out];
[out]trim=0:32,setpts=PTS-STARTPTS[video]" -map "[video]" -map "[mixedAudio]" -
pix_fmt yuv420p -c:v libx264 -crf 18 -shortest {outputFilePath}


  


  Here is the Expo app code

  


  import React, { useState, useEffect, useContext, useRef } from &#x27;react&#x27;;&#xA;import { View, Text, ScrollView, TouchableOpacity, Dimensions } from &#x27;react-native&#x27;;&#xA;&#xA;const Container = () => {&#xA;    const vidRef = useRef(null);&#xA;return (&#xA;    <scrollview style="{{" 1="1">&#xA;      &#xA;    </scrollview>&#xA;  );&#xA;};&#xA;&#xA;export default Container;&#xA;

  


• Piwik Mobile 2 for Android – Release Candidate

  6 novembre 2013, par thomas — Community

  Exciting news ! We are proud to announce the availability of the first release candidate of Piwik Mobile 2 for Android. Check out the videos here or learn more in the FAQ.

  Piwik Mobile Users : we need your feedback !

  We have been testing Piwik Mobile 2 extensively at present. Now is your time to help us to track down any bugs, or even suggest usability improvements before the upcoming release in a few weeks. We are really interested in your feedback !

  Download

  Piwik Mobile 2 RC 1 for Android 4+

  Known issues

  All known issues are Piwik related and most of them will be fixed in the Piwik 2.0 release :

  • Some visitors in Visitor Log might be skipped #4044 (fixed)
  • If you are using a report date like “Last 7″ or “Last 30″, the number of visits won’t be displayed in the “All Websites Dashboard” #4068
  • Sometimes an HTML entity is displayed in the visitor screen #3970 (fixed)
  • Evolution graph fails to load and returns stack trace for Actions.getPageUrls #3943 (fixed)
  • Date Range is not correct recognized under circumstances #3074 (fixed)

• accelerate x264 encoding

  7 août 2012, par Saraswati

  i am making use of x264 to encode raw data captured from the iphone camera .. but the encoding is very slow .Can anyone help me accelerate the encoding speed.

  I have used following settings to build x264 lib :

  //for armv6

  CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure —host=arm-apple-darwin —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk —prefix='dist' —extra-cflags='-arch armv6' —extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system/ —extra-ldflags='-arch armv6' —enable-pic —disable-asm

  //for armv7

  CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure —host=arm-apple-darwin —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk —prefix='dist' —extra-cflags='-arch armv7' —extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system/ —extra-ldflags='-arch armv7' —enable-pic

  I am using default preset like this :

  x264_param_default_preset(param, "slow", "zerolatency");

  and setting few perameters :

  param->i_bframe = 0;
  
  param->analyse.i_me_method = X264_ME_HEX;
  
  param->analyse.i_subpel_refine = 2;
  
  param->i_frame_reference = 1;
  
  param->analyse.b_mixed_references = 0;
  
  param->analyse.i_trellis = 0;
  
  param->rc.b_mb_tree = 0;
  
  param->analyse.i_weighted_pred = X264_WEIGHTP_NONE;
  
  
  
  
  
  param->rc.i_bitrate = 180;
  
  param->rc.i_qp_min = 20; 
  
  param->rc.i_qp_max = 26; 
  
  
  
  param->i_keyint_max = 15; 
  
  param->i_keyint_min = 15;
  
  
  
  
  
  param->i_width = w;
  
  param->i_height = h;
  
  
  
  x264_param_apply_profile(param, "baseline");
  
  x264_picture_alloc( &(enc->pic), X264_CSP_I420, param->i_width, param->i_height );