Category Archives: ffmpeg

ERROR:HLSError – Cannot load M3U8: crossdomain access denied:Error #2048


ERROR:HLSError(code/url/msg)=1/ load M3U8: crossdomain access denied:Error #2048 VM1749:1 INFO:HLSNetStream:close

This is my crossdomain.xml example…

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "">
    <allow-access-from domain="*" secure="false" />
    <allow-http-request-headers-from domain="*" headers="*" secure="false"/>

PHP exec in background

So, in one of my projects/products/services, I need to execute ffmpeg via PHP…
Usually I use at do send the job to a queue list.. unfortunately in two different clients’ servers somehow PHP + exec and at doesn’t work well….

This is how we send a PHP exec to background

exec(command > /dev/null 2>/dev/null &);


As seen on

Install FFMPEG on Centos / CPanel FFmpeg Static Builds

Download the latest FFmpeg Static Builds from

How to know if we need to download the 32 or 64 bits?
Lets run:

cat /etc/*release*
CentOS release 6.6 (Final)

Or using uname (more reliable)

uname -m

I’v download it do a specific folder


And the run the following command to uncompress it:

tar xf ffmpeg-git-64bit-static.tar.xz

To run ffmpeg or ffprobe we need to give the full path to them!

It worked!

With the lastest versions!



-bash-3.2$ tar -xf ffmpeg-git-64bit-static.tar.xz 
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Archive contains obsolescent base-64 headers
tar: Read 5668 bytes from ffmpeg-git-64bit-static.tar.xz
tar: Error exit delayed from previous errors

tar version (fuckz!)

tar (GNU tar) 1.15.1

Well, this machine, where I got this error, is a managed server…
I didn’t bored to ask support to upgrade TAR or install XZ… but if you want, you can install XZ and then…

xz -d archive.tar.xz
tar xvf archive.tar

It might work! 🙂
Btw! On old machines kernel might not be compatible

Frame rate very high for a muxer not efficiently supporting it

I had a 1h video, with about 400Mb…
My batch was taking HOURS (with a 8 core CPU) and creating a 5Gb mp4 file of the encoding….. wtf?

13442 www-data 22 2 1426m 361m 3884 R 614 4.5 2180:37 ffmpeg 
14462 www-data 22 2 1773m 966m 3660 R 100 12.1 293:07.12 ffmpeg

I had to run the command manually and figure out the issue.

 creation_time : 2014-04-19 19:19:31
File 'video.mp4' already exists. Overwrite ? [y/N] y
[mp4 @ 0x26a8ae0] Frame rate very high for a muxer not efficiently supporting it.
Please consider specifying a lower framerate, a different muxer or -vsync 2
[libx264 @ 0x26c6ce0] using SAR=1/1
[libx264 @ 0x26c6ce0] MB rate (108000000) > level limit (2073600)

I had to add -vsync 2 to solve this.

/usr/bin/ffmpeg -i 14-18-14.mp4 -c:v libx264 -vsync 2 -threads 4 video.mp4


FFMpeg Benchmark – Effect of Threads and Bitrate on Image Quality


If you have been following along, we have recently been doing a series on command line video tools. Here I review a recent ffmpeg benchmark I performed. After reviewing the documentation and encoding a few sample videos, my questions were as follows:

  • How long does each of the various ffmpeg preset take for h264 encoding?
  • How much faster is the encoding with multiple threads?
  • For a given variable bitrate, does a given preset make a difference in image quality?
  • What is the optimal preset for ffmpeg?




Open-Sourced H.264 Removes Barriers to WebRTC

When it comes to making collaboration technology such as high-definition video open and broadly available, it’s clear that the web browser plays an important role. The question is, how do you enable real-time video natively on the Web? It’s a question that folks are anxious to have answered.

WebRTC–a set of enhancements to HTML5–will address the issue head on. But, there is an important hurdle that must first be cleared, and that’s standardizing on a common video codec for real-time communications on the web – something the Internet Engineering Task Force (IETF) will decide next week.

The industry has been divided on the choice of a common video codec for some time, namely because the industry standard–H.264–requires royalty payments to MPEG LA. Today, I am pleased to announce Cisco is making a bold move to take concerns about these payments off the table.

We plan to open-source our H.264 codec, and to provide it as a binary module that can be downloaded for free from the Internet. Cisco will not pass on our MPEG LA licensing costs for this module, and based on the current licensing environment, this will effectively make H.264 free for use in WebRTC.
Read more:

zencoder – what do they use…


  • aspera


Only encoding/transcoding
Encoding, hosting and video players

ffmpeg – watermark positions

This are the command lines that I use to add the watermark picture named watermark.png on the video named source.avi and export to output.flv.

Tested on a DigitalOcean Virtual server! 😉

rock ssd

The 10 values are the paddings!

Top left
ffmpeg –i source.avi -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:10 [out]" output.flv

Top right
ffmpeg –i source.avi -vf "movie=watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" output.flv

Bottom left
ffmpeg –i source.avi -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" output.flv

Bottom right
ffmpeg –i source.avi -vf "movie=watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" output.flv

ffmpeg –i source.avi -vf “movie=watermark.png [watermark]; [in][watermark] overlay=main_w/2-overlay_w/2:main_h/2-overlay_h/2 [out]” output.flv