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finding a solution to watermark on video being unsharp/pixelated
the web video script that I’m using adds a watermark successfully, however, the watermark.png looks ok on the small screen, but when full screen is selected the watermark.png image looks much less sharp.
‘scale2ref’ seems like a possible solution. I have tried different attempts with it without success. The ffmpeg documentation shows:
“Scale a logo to 1/10th the height of a video, while preserving its display aspect ratio”:
[logo-in][video-in]scale2ref=w=oh*mdar:h=ih/10[logo-out][video-out]I need guidance with integrating scale2ref into a current line of code, for example:
$ffmpegCommand =”.$ffmpeg_b.’ -y -i ‘.$video_file_full_path.’ -i ‘.escapeshellarg($watermark_image_full_path).’ -i ‘.escapeshellarg($watermark_image_full_path).’ -filter_complex “scale=426:-2, scale=426:-2, overlay=10:10, overlay=170:170:enable=between(t\,5\,5+2)” -vcodec libx264 -preset ‘.$pt->config->convert_speed.’ -crf 26 ‘.$video_output_full_path_240.’ 2>&1′;
any additional assistance is appreciated.
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2 Replies
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What are the resolutions of the logo graphic and the video clip?
If for example the video is 1920×1080 and logo is 400×400, the logo is not going to look good blown up that much, just isn’t
Thanks
Jeff
Jeff Pulera
Safe Harbor Computers -
If you know you aren’t upscaling (which is bad) then the culprit is probably the chroma subsampling occurring in the overlay filter. Use the “format=auto” option in the overlay filter, such as:
overlay=10:10:format=autoUse the code button next time to properly format your command.
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