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• How to compress output file using FFmpeg - Apple ProRes 422

  17 octobre 2018, par user1526912

  I am new to video encoding and trying to encode a music video for the apple itunes video store.

  I am currently using FFmpeg for encoding.

  My source file is mp4 file type and file size=650MB

  I encode the file using the Apple ProRes 422 (HQ) codec and output a mov file.

  ffmpeg -y -i busy1.mp4  -vcodec prores -profile:v 3 -r "29.97" -c:a mp2   busy2.mov

  I am trying to encode the video according to the following specs :

  ● Apple ProRes 422 (HQ)
  ● VBR expected at 220 Mbps

  Encoded PASP Converted to ProRes From
  1920 x 1080 1:1 HDCAM SR, D5, ATSC
  1280 x 720 1:1 ATSC progressive

  29.97 interlaced frames per second for video sourced

  Music Video Audio Source Profile

  ● MPEG-2 layer II stereo
  ● 384 kpbs
  ● 48Khz

  The file is encoded perfectly fine however the output is 6Gb in size.

  Why would the file be so large after encoding ?

  Am I doing something wrong here ?

• FFMPEG encoding is rotating portrait images uploaded from the iPhone

  27 juillet 2017, par Kevin J

  I’m trying to figure out why FFMPEG is rotating my thumbnail image when a portrait video is uploaded from an iphone.

  Here is my command line test :

  ffmpeg -i video/test.mp4 -c:v libx264 -profile:v high -level 5 -crf 18 -preset medium -maxrate 10M -bufsize 16M -pix_fmt yuv420p -vf "scale=iw*sar:ih, scale=\'if(gt(iw,ih),min(1920,iw),-1)\':\'if(gt(iw,ih),-1,min(1080,ih))\'" -x264opts bframes=3:cabac=1 -movflags faststart -b:a 320k -y video/test.mp4 -vcodec mjpeg -vframes 1 -an -f rawvideo -s 410x231 video/testthumb.jpg 2>&1

  Then the portrait image is rotated 90 degrees to be made a landscape image, but the video stays portrait. How can I keep the orientation the same ?

• How to apply multiple filters and inputs with ffmpeg

  24 juillet 2017, par Jason

  Not only do I have multiple filters, I have multiple inputs that I want to overlay. I usually have to them in 2-3 steps and wonder how to do it all in one command as it should be the most efficient way ?

  1 and 2 literally identical. For readability, I’ve cut out the actual filters which are very long and complicated.

  1. image slide in left onto video
  2. Take output of 1, image slide in right
  3. Take output 2, textbox image fade in

  4. Take output3, text fade in (finish)

     1)
     
     ffmpeg -i input.mp4 -loop 1 -i image.jpg -filter_complex \
     
           "[1]scale=640:-1[i0]; \
     
            [i0]drawbox=color=white:t=15[i1]; \
     
            [i1]format=,fade=[i2]; \
     
            [i2]rotate=[i3]; \
     
            [0][i3]overlay= \
     
     -c:v libx264 -vb 10M output1.mp4
     
     
     
     2)
     
     ffmpeg -i output1.mp4 -loop 1 -i image2.jpg -filter_complex \
     
           "[1]scale=[i0]; \
     
            [i0]drawbox=[i1]; \
     
            [i1]format=,fade=[i2]; \
     
            [i2]rotate=[i3]; \
     
            [0][i3]overlay=" \
     
     -c:v libx264 -vb 10M output2.mp4
     
     
     
     3)
     
     ffmpeg -i output2.mp4 -i image3.jpg -filter_complex \
     
           "[1]scale=1080:-1 [ovrl], \
     
            [ovrl]format=fade=[i]; \
     
            [0][i]overlay=" \
     
     -c:v libx264 -vb 10M output4.mp4
     
     
     
     
     
     4)
     
     ffmpeg -i output4.mp4 -filter_complex "drawtext=" -vb 10M finaloutput.mp4