ffmpeg watermark video while uploading

Question

I have a CMS system for uploading videos using ffmpeg, I cannot figure a way to watermark the videos every time I'm getting errors (video cannot play) or error encoding etc. The command for processing the videos is:

$shell     = shell_exec("$ffmpeg_b -y -i $video_file_full_path -vcodec libx264 -preset {$pt->config->convert_speed} -filter:v scale=426:-2 -crf 26 $video_output_full_path_240 2>&1");

I have tried this command also:

$shell     = shell_exec("$ffmpeg_b -y -i $video_file_full_path -vcodec libx264 -preset {$pt->config->convert_speed} -filter:v scale=426:-2 -crf 26 -i watermark.png -filter_complex 'overlay=10:10' $video_output_full_path_240 2>&1");

This not seems to work.. is there any way I can troubleshoot this ?

Answer 1

Problems

If you were to refer to the output from ffmpeg you would encounter two errors:

• Option filter:v (set stream filtergraph) cannot be applied to input url watermark.png -- you are trying to apply an input option to an output file or vice versa. Move this option before the file it belongs to. Error parsing options for input file watermark.png .

• Filtergraph 'scale=426:-2' was specified through the -vf / -af / -filter option for output stream 0:0, which is fed from a complex filtergraph. -vf / -af / -filter and -filter_complex cannot be used together for the same stream.

Solutions

• Option placement matters. You are mixing placement of input and output options. Placement must be as follows:

    ffmpeg [global options] [input0 options] -i input0 [input1 options] -i input1 [output options] output

• Do not mix -vf and -filter_complex . Do all filtering in one -filter_complex instance.

Example

ffmpeg -i video.mp4 -i watermark.png -filter_complex "[0]scale=426:-2[bg];[bg][1]overlay=10:10" -c:v libx264 -preset fast -crf 26 output.mp4