Sunday, May 8, 2016

Debian---Mkv to mp4/avi video conversion

    Today I come across a .mkv file which if played on some video player only video was working but no audio but  in others  only audio was working but not video.
    I decided to see if I can convert between .mkv to .mp4 or some other video format which can play both audio & video simultaneously.

With by debian 8 machine console & Internet  quest started

First conversion from mkv to avi

apt-get install libav-tools
avconv -i myfile.mkv -codec copy myfile.mp4

.mp4 file generated was still had problem

Conversion from mkv to avi

ffmpeg -i myfile.mkv -c:v copy -c:a copy myfile.avi

.avi file generated was still had problem

after some failed attempt finally I managed to get a avi file in which i can play both audio video simultaneously.

here is the command

ffmpeg -i video.mkv -bsf:v h264_mp4toannexb -c:v copy  -c:a libmp3lame -b:a 128k video.avi

Thursday, December 31, 2015

Running direct SQL query from Entity Framework

First we will create a test table in our database

CREATE TABLE [dbo].[Address](
                [Id] [int] IDENTITY(1,1) NOT NUL primary keyL,
                [AddressLine1] [varchar](100) NULL,
                [AddressLine2] [varchar](100) NULL,
                [City] [varchar](100) NULL,
                [ZipCode] [varchar](15) NULL,
                [Phone] [varchar](15) NULL,
                [Mobile] [varchar](15) NULL
Create a console application ,Add Ado.Net entity model for database in which we have just created test table,while selecting tables make sure Address table is selected.

In my case database was Playground & context class generated is  PlaygroundEntities.

Inside your main we will add our code that will do native query on top of context class using ExecuteStoreQuery

Here is my code inside main
static void Main(string[] args)
            PlaygroundEntities db = new PlaygroundEntities();
            //var query = from m in db.Addresses where m.City == "kankavali" select m;
            object[] parameters = { "1"};
            ObjectResult<ShortAddress> ads = db.ExecuteStoreQuery<ShortAddress>("select Id,AddressLine1 from Address where id= {0}", parameters);
            foreach (ShortAddress i in ads)
As in select I am taking only 2 columns and address entity has more column we need to have one more class of whose type our result is.

That’s why we will add a simple class as follows

class ShortAddress
        public int Id { get; set; }
        public string AddressLine1 { get; set; }
time to insert some test records in Address table. Now we are ready to run console application and check output