molotov.bliss » Design

Combine H.264 MP4 Files and Add Audio via MP4Box and FFMPEG

B00MER — Wed, 19 Aug 2009 04:45:09 +0000

Some late night fun… Since I can’t sleep… I’ve successfully found a means to combine multiple video files and add audio to a combined video progmatically and documenting my findings, thought I would share…

First I had to install GPAC which contains MP4Box, using it allows to combine the video files pre-existing as we have them now into one single file (1.mp4 and 2.mp4 are video files captured with an AXIS IP Camera in H.264):

^?View Code PHP

1	MP4Box -cat 1.mp4 -cat 2.mp4 out.mp4

Next we determine the length in seconds of the video, this is where a custom PHP Script is involved that will determine the length:

^?View Code PHP

$output = shell_exec("/usr/local/bin/ffmpeg -i {$path}");
preg_match('/Duration: ([0-9]{2}):([0-9]{2}):([^ ,])+/', $output, $matches);
$time = str_replace("Duration: ", "", $matches[0]);
$time_breakdown = explode(":", $time);
$total_seconds = round(($time_breakdown[0]*60*60) + ($time_breakdown[1]*60) + $time_breakdown[2]);

With the example file, here’s what the PHP script would see:

^?View Code PHP

1 2	ffmpeg -i out.mp4 2>&1 \| grep Duration Duration: 00:00:13.60, start: 0.000000, bitrate: 875 kb/s

And then we cut the audio file accordingly, the above PHP script returned 14 seconds for our two combined videos, since 13.60 is rounded to 14 from MP4Box, so it starts at 00:00:00 and takes a total time of 14 seconds of the audio file and creates a new file to be used next.

^?View Code PHP

1	ffmpeg -ss 00:00:00 -t 14 -i music.mp3 final.mp3

Take the combined videos from MP4Box and add the newly created 14 second final.mp3 file and create the final file for viewing.

^?View Code PHP

1	ffmpeg -vcodec copy -i final.mp3 -i out.mp4 final.mp4

If your wanting to have progressive downloading for web playback:

^?View Code PHP

1	MP4Box -inter 0.5 final.mp4

END RESULT:

Possibly Related Posts:

Old ANSI Art

B00MER — Thu, 26 Mar 2009 23:16:59 +0000

Stumbled upon SixTeenColors.net and found some of my old ANSI Art I had done back around 1994-1996 mainly for the group Relic and thought I would post them up for nostalgic purposes, since I’ll be turning 30 tomorrow!

I really hate SVGallery anyone know of a better one for WordPress?

Here a SimpleViewer Flash gallery should be displayed. Click here to open the post in your browser to see the gallery.

Possibly Related Posts:

Techy Logo inspiration from Redkroft

admin — Thu, 26 Mar 2009 07:43:54 +0000

Checkout more of Redkroft’s great logos:

Redkroft » Logo.

Possibly Related Posts:

Chrome Experiments: Ball Pool

admin — Wed, 18 Mar 2009 23:17:56 +0000

Some really nice Javascript demonstrations. May work best in Google Chrome.

Chrome Experiments – Detail – Ball Pool.

Possibly Related Posts: