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• FFmpeg drawtext over multiple lines

  26 août 2023, par Jay

  I have the code :

  


  import subprocess , os

ffmpeg = "C:\\ffmpeg_10_6_11.exe"
inVid = "C:\\test_in.avi"
outVid = "C:\\test_out.avi"

if os.path.exists( outVid ):
os.remove( outVid )
proc = subprocess.Popen(ffmpeg + " -i " + inVid + ''' -vf drawtext=fontfile=/Windows/Fonts/arial.ttf:text="onLine1 onLine2 onLine3":fontcolor=white:fontsize=20 -y ''' + outVid , shell=True, stderr=subprocess.PIPE)
proc.wait()
print proc.stderr.read()
os.startfile( outVid )


  


  to write text to a video file. But I want to write out many lines of text instead of just having it all on the one line.

  


  How can I do that ?

  


• FFmpeg drawtext over multiple lines

  22 novembre 2015, par Jared Glass

  I have the code :

  import subprocess , os
  
  
  
  ffmpeg = "C:\\ffmpeg_10_6_11.exe"
  
  inVid = "C:\\test_in.avi"
  
  outVid = "C:\\test_out.avi"
  
  
  
  if os.path.exists( outVid ):
  
  os.remove( outVid )
  
  proc = subprocess.Popen(ffmpeg + " -i " + inVid + ''' -vf drawtext=fontfile=/Windows/Fonts/arial.ttf:text="onLine1 onLine2 onLine3":fontcolor=white:fontsize=20 -y ''' + outVid , shell=True, stderr=subprocess.PIPE)
  
  proc.wait()
  
  print proc.stderr.read()
  
  os.startfile( outVid )

  to write text to a video file. But I want to write out many lines of text instead of just having it all on the one line.

  Pls help. Thanks

• How to optimize encoding and packaging videos using ffmpeg and shaka-packager

  16 novembre 2020, par Saidamir Botirov

  I'm trying to encode and package uploaded videos for an LMS website where video size may differ. How can I write a sh script that converts and packages the given video based on its size (For ex. if the given video resolution is bigger than 720p and less than 1080p FFmpeg should convert videos in 2 sizes [360p, 720p] then shaka-packager should package them).

  


  So far I have this script assuming that input video resolution is 1080p (or 1080p <= size < 4k)

  &#xA;

  #!/bin/sh
pwd
URL="$1"
ID="$2"
FOLDER="$3"

if [ -z "$URL" ];then
    echo "Must input a file"
    $SHELL
    exit
fi

DIR="$FOLDER/$ID"
OUTDIR="$DIR/cmaf"
mkdir -p -v $DIR
mkdir -p -v $OUTDIR

GOP_SIZE=50
FPS=25
CRF=28

INPUT="$DIR/input"
wget -c -O $INPUT $URL &&

if [ ! -f $FILE ]; then
    echo "$FILE does not exists"
    $SHELL
    exit
fi

ffmpeg -i $INPUT -y \
-threads 1 \
-c:v libx264 -crf $CRF -profile:v high -pix_fmt yuv420p \
-keyint_min $GOP_SIZE -g $GOP_SIZE -sc_threshold 0 \
-color_primaries 1 -color_trc 1 -colorspace 1 -movflags +faststart \
-c:a aac -b:a 128k -ar 44100 \
-r $FPS \
"$DIR/input.mp4" &&

ffmpeg -i "$DIR/input.mp4" -y \
-threads 1 \
-vn -acodec copy "$DIR/a.mp4" \
-vf scale=640:360 -an "$DIR/360p.mp4" \
-vf scale=1280:720 -an "$DIR/720p.mp4" \
-vf scale=1920:1080 -an "$DIR/1080p.mp4" &&

rm -R $OUTDIR

packager \
in="$DIR/a.mp4",stream=audio,output="$OUTDIR/a.mp4",drm_label=AUDIO \
in="$DIR/360p.mp4",stream=video,output="$OUTDIR/360p.mp4",drm_label=SD \
in="$DIR/720p.mp4",stream=video,output="$OUTDIR/720p.mp4",drm_label=HD \
in="$DIR/1080p.mp4",stream=video,output="$OUTDIR/1080p.mp4",drm_label=HD \
--enable_raw_key_encryption \
--keys label=AUDIO:key_id=f3c5e0761e6654b28f8049c778b23947:key=a4637a153a443df9eed0593043db7517,label=SD:key_id=abba277e8bcf552bbd2e86a434a9a5d7:key=69eaa807a6763af979e8d1940fb88397,label=HD:key_id=6d76f25cb17f5e76b8eaef6b7f582d87:key=cb541784c99737aef4fff74500c12ea7 \
--pssh 000000377073776800000000EDEF8BA979D64ACEA3C877DCD51D21ED00000071220F7465737420636F6E74656E74206967 \
--mpd_output "$OUTDIR/h264.mpd" \
--hls_master_playlist_output "$OUTDIR/h264_master.m3u8"


  &#xA;

  The above script first downloads a video by a given URL then converts it to appropriate video format before resizing and packaging. I assumed if I convert the video before scaling would be more performant than every time converting and resizing it. Also, I assumed if I resize to all resolutions in one command it would be much faster, but I think that is not how FFmpeg works. I'm stack in the world of FFmpeg not knowing how to write sh(or bash) script better, cleaner and dynamic for encoding and packaging videos for online streaming. I think there are others with the same problem or the same case. So any help, fix and recommendation is appreciated

  &#xA;