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I would like to add a text to a video file with FFMPEG. While I was able to do this with plain text

$FFMPEG -y -i $SOURCE \ -vf drawtext="fontfile=/usr/share/fonts/Lato-Reg-webfont.ttf:fontsize=40:box=1:boxcolor=black:fontcolor=white:text='$WATERMARK':x=(main_w-text_w)-10:y=(main_h-text_h)-4" \ -threads $THREADS -f mp4 -vcodec mpeg4 -b $MOBILE_BITRATE -r $MOBILE_FRAME_RATE -strict -2 \ -s $RESOLUTION_SD -acodec libfaac -ar $MOBILE_AUDIO_RATE -ac $MOBILE_AUDIO_CHANNELS -ab $MOBILE_AUDIO_BITRATE \ $VIDEONAME_MOBILE-android.mp4

this won't look good enough. So I tried with adding a transparent PNG file as a watermark. Looking for examples I tried like this:

$FFMPEG -y -i $SOURCE \ -vf "movie=$WATERMARK_SMALL_PATH [watermark]; [in][watermark] overlay=10:main_h/2-overlay_h/2 [out]" \ -threads $THREADS -f mp4 -vcodec mpeg4 -b $MOBILE_BITRATE -r $MOBILE_FRAME_RATE -strict -2 \ -s $RESOLUTION_SD -acodec libfaac -ar $MOBILE_AUDIO_RATE -ac $MOBILE_AUDIO_CHANNELS -ab $MOBILE_AUDIO_BITRATE \ $VIDEONAME_MOBILE-android.mp4

it won't work. I can share the exact error output if that could be useful to anyone.

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  • Have you tried looking here ? stackoverflow.com/questions/17135973/…
    – Ely
    Nov 19, 2013 at 13:22
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    You need to show the actual, unscripted ffmpeg commands and the complete ffmpeg console outputs.
    – llogan
    Nov 19, 2013 at 17:57

1 Answer 1

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With the overlay filter you don't need the movie= format. It's easier, so use this format instead:

ffmpeg -y -i inputmovie -i inputpicture.png -filter_complex 'overlay=0:0' -s 1280x720 ...other parameters... outputfile.mp4

The size I put in is as an example only- yours will be different. Note that the size is the same for the picture as well as the movie frame, and no scaling is actually being done here. The 0:0 is for alignment of the picture to the top left of the movie frame- this is logical since they are both the same size.

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  • A complex filtergraph uses one or more inputs and produces one or more outputs, so -filter_complex should be used here instead of -vf. -y is a global option so it should be the first option. The scaling should be in the filtergraph by using the scale filter instead of using -s; otherwise it may be ambiguous as to when and where it is being applied.
    – llogan
    Nov 20, 2013 at 18:29
  • @LordNeckbeard Thanks. Always used -filter_complex because there were other filters in the chain. It was wrong for me to infer that removing other filters from the chain automatically would mean that -vf would work. I realize now that there are 2 inputs. Correcting it.
    – Rajib
    Nov 21, 2013 at 2:45
  • This could probably be improved upstream since I think using -filter_complex works for linear filtering/simple filtergraphs too (but I may be wrong about that and I haven't looked at the code).
    – llogan
    Nov 21, 2013 at 2:58
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    Thank you @Rajib, it worked how you suggested. Anyway, an important detail for is that I needed to also convert the PNG to 8bit using pngquant
    – Alex Flo
    Nov 22, 2013 at 13:48
  • @Alex Flo It would be great if you share your full command for everyone's benefit.
    – Rajib
    Nov 22, 2013 at 14:18

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