Август | 2016 | Блог очередного разработчика

Mobile Chrome http streaming(m3u8) doesnt work

Опубликовано 29.08.2016

Wrong X-TARGETDURATION in m3u8 playlist causes error on Andorid Chrome.
Error not visible in console or everywhere else, so its really hard to detect.
Chrome Desktop ignore this error for some reason, but mobile sensitive to it.

I have wrongly thought that it should be full video duration.

Solution is: X-TARGETDURATION should contain duration of longest video fragment.

Here is an example of a Media Playlist:

#EXTM3U
#EXT-X-TARGETDURATION:10

#EXTINF:9.009,
http://media.example.com/first.ts
#EXTINF:9.009,
http://media.example.com/second.ts
#EXTINF:3.003,
http://media.example.com/third.ts

The first line is the format identifier tag #EXTM3U. The line
containing #EXT-X-TARGETDURATION says that all Media Segments will be
10 seconds long or less. Then three Media Segments are declared.
The first and second are 9.009 seconds long; the third is 3.003
seconds.

Specs

Debian Jessie bitcoind BerkeleyDB

Опубликовано 28.08.2016

Installing dependencies like here build unix

BerkeleyDB is required for the wallet.

Debian repository doesn’t contains libdb4.8. So need to get sources and compile it manually.

Get db4.8 source, compile and install:

wget http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz
tar -xzvf db-4.8.30.NC.tar.gz
cd db-4.8.30.NC/build_unix
../dist/configure --enable-cxx
make
make install

wget http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz

tar -xzvf db-4.8.30.NC.tar.gz

cd db-4.8.30.NC/build_unix

../dist/configure --enable-cxx

make

make install

Tell your system where to find db4.8

export BDB_INCLUDE_PATH="/usr/local/BerkeleyDB.4.8/include"
export BDB_LIB_PATH="/usr/local/BerkeleyDB.4.8/lib"
ln -s /usr/local/BerkeleyDB.4.8/lib/libdb-4.8.so /usr/lib/libdb-4.8.so

export BDB_INCLUDE_PATH="/usr/local/BerkeleyDB.4.8/include"

export BDB_LIB_PATH="/usr/local/BerkeleyDB.4.8/lib"

ln -s /usr/local/BerkeleyDB.4.8/lib/libdb-4.8.so /usr/lib/libdb-4.8.so

Then move to bitcoin sources folder and compile it:

./configure CPPFLAGS="-I/usr/local/BerkeleyDB.4.8/include -O2" LDFLAGS="-L/usr/local/BerkeleyDB.4.8/lib"
make
make install

./configure CPPFLAGS="-I/usr/local/BerkeleyDB.4.8/include -O2" LDFLAGS="-L/usr/local/BerkeleyDB.4.8/lib"

make

make install

Sources:
https://github.com/bitcoin/bitcoin/issues/3686#issuecomment-35211263
https://github.com/bitcoin/bitcoin/issues/3686#issuecomment-35236768

MySQL utf8 Incorrect string value

Опубликовано 23.08.2016

How to fix “Incorrect string value” errors?
Mysql support only 3 bytes in «basic» utf8.
So in case of use some new characters like emoji it gives Incorrect string value error.

To fix this error you need change encoding utf8 to utf8bm4.

CloudFlare отдача и кеширование видео

Опубликовано 16.08.2016

Стриминг видео с сервера очень сильно кушает канал. Поэтому появляется мысль кешировать видео через CloudFlare.
При этом надо сохранить возможность перемотки и разбить файлы на небольшие куски, чтобы CF ничего не заподозрил, а так же не попасть под лимит который не кешируется.
Будем использовать Uppod плеер.

1. Разбить видео
2. Создать страницу сайта

UP 19.07 Трафик продолжает снижаться

(далее…)

Ubuntu Gnome huge CPU usage of gnome-keyring-daemon when starting Google Chrome

Опубликовано 15.08.2016

I have a lot saved passwords in Google Chrome about 2000.
So when I try to sync it on any linux distr. I got high cpu usage from keyring daemon.

To prevent it we need disable password encryption ;(
1. Open Terminal
2.

sudo nano /usr/bin/google-chrome

1	sudo nano /usr/bin/google-chrome

sudo nano /usr/bin/google-chrome-stable

1	sudo nano /usr/bin/google-chrome-stable

3. Find these lines at end of file

if [[ -n "$CHROME_USER_DATA_DIR" ]]; then
  # Note: exec -a below is a bashism.
  exec -a "$0" "$HERE/chrome"  \
    --user-data-dir="$CHROME_USER_DATA_DIR" "$@"
else
  exec -a "$0" "$HERE/chrome" "$@"
fi

if [[ -n "$CHROME_USER_DATA_DIR" ]]; then

# Note: exec -a below is a bashism.

exec -a "$0" "$HERE/chrome" \

--user-data-dir="$CHROME_USER_DATA_DIR" "$@"

else

exec -a "$0" "$HERE/chrome" "$@"

4. Replace with

if [[ -n "$CHROME_USER_DATA_DIR" ]]; then
if [[ -n "$CHROME_USER_DATA_DIR" ]]; then
  # Note: exec -a below is a bashism.
  exec -a "$0" "$HERE/chrome"  \
    --user-data-dir="$CHROME_USER_DATA_DIR"  \
    --password-store=basic "$@"
else
  exec -a "$0" "$HERE/chrome"  \
    --password-store=basic "$@"
fi

if [[ -n "$CHROME_USER_DATA_DIR" ]]; then

# Note: exec -a below is a bashism.

exec -a "$0" "$HERE/chrome" \

--user-data-dir="$CHROME_USER_DATA_DIR" \

--password-store=basic "$@"

else

exec -a "$0" "$HERE/chrome" \

--password-store=basic "$@"

5. Save it.
6. Kill all keyring processes.
7. Restart Chrome, wait password sync.
8. Profit!

Laravel 5.2 + JWT + Dingo API + PHPUnit

Опубликовано 12.08.2016

The token could not be parsed from the request

The token could not be parsed from the request

For some magic reasons(simulating requests) phpunit can’t pass tests with JWT token header or GET param token=?.

Solution is just add few lines to middleware or anywhere else like this.

Got it work with this code in my middleware:

if (env('APP_ENV') === 'testing') {
    JWTAuth::setRequest($request);
}

if (env('APP_ENV') === 'testing') {

JWTAuth::setRequest($request);

}

Result middleware for api auth

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Auth;
use Illuminate\Http\Request;
use JWTAuth;

class AuthenticateApi
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @param  string|null  $guard
     * @return mixed
     */
    public function handle(Request $request, Closure $next,  $guard = null)
    {
        if (env('APP_ENV') === 'testing') {
            JWTAuth::setRequest($request);
        }

        JWTAuth::parseToken();
        $user = JWTAuth::parseToken()->authenticate();

        return $next($request);
    }
}

<?php

namespace App\Http\Middleware;

use Closure;

use Illuminate\Support\Facades\Auth;

use Illuminate\Http\Request;

use JWTAuth;

class AuthenticateApi

{

/**

* Handle an incoming request.

* @param \Illuminate\Http\Request $request

* @param \Closure $next

* @param string|null $guard

* @return mixed

public function handle(Request $request, Closure $next, $guard = null)

{

if (env('APP_ENV') === 'testing') {

JWTAuth::setRequest($request);

}

JWTAuth::parseToken();

$user = JWTAuth::parseToken()->authenticate();

return $next($request);

}