The task was quite easy to convert a bunch of video files in a Folder to webm format .
There are several free so called free software who announce to do that but most are bumpy and even my so loved miro convertor produce a webm files that don’t play in google chrome . the ffmpeg package inside was outdated.
First check if you have ffmpeg installed on your mac , open the terminal and enter
ffmpeg -v to get the version or
wich ffmpeg to get the path where its installed
SINGEL WEBM CONVERT WITH FFMPEG
To Convert a single mp4 video file we start with this ffmpeg command
ffmpeg -i myvideofile.mp4 -acodec libvorbis -aq 5 -ac 2 -qmax 25 -threads 2 myvideofile.webm
Markup : ffmpeg -i INPUT File Use acodec Libvorbis AC QMAX : qmax and qmin are the ‘quality-ranges’ in which you define to encode. Expect that higher the values the lower the quality.
qmin 50 an qmax 51 gives the lowest quality
qmin 0 -qmax 1 gives the highest quality
If we need aditional mp4 files from our quiteime mov file we can use this ffmpeg command. The command line can alos replaced in our batch file below .
ffmpeg -i myvideofile.mov -qscale 0 myvideofile.mp4WEBM BATCH SCRIPT
Since we have several quicktime mov video files we write a little bash script to to automate this .
#!/bin/bash
for i in *.mov;
do name=`echo $i | cut -d'.' -f1`;
echo $name;
ffmpeg -i "$i" -acodec libvorbis -aq 5 -ac 2 -qmax 25 -threads 2 "${name}.webm";
done
Edit this file with any text editor or code editor like sublime Text . Save it in the folder where your videos are in my case saved as
webmconvert
Now we need to chmod the file to make it executable
CHMOD 700 webmconvert Thats it the basch script takes every video from the folder and convert it to a webml video that plays nice in your HTML5 video player .
Now start the bash script with
./webmconvert The first line #!/bin/bash tells the terminal that we are using bash shell, we loop all files with ending mov output echo the name and save it with the same name as webm.