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• ffmpeg converting mov to mp4

  16 mai 2019, par alienbuild

  Trying to convert .mov to .mp4. Tried various suggestion codes on stackoverflow but nothing seems to be working.

  `...muxer does not support non seekable output [48] => Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument [49] => Error initializing output stream 0:0 -- [50] => Conversion failed! ) 1`

  I’ve tried various codec properties such as ac3, aac, libvo_aacenc

  exec('
  
  /usr/local/bin/ffmpeg -y -i https://***.***.com/assets/regions/region-1/input.mov' . 
  
  ' -c:a ac3 ' 
  
  . 'https://***.***.com/assets/regions/region-1/output.mp4' 
  
  . ' 2>&1', $out, $res);
  
  
  
  $modx->log(modX::LOG_LEVEL_ERROR, print_r($out));
  
  $modx->log(modX::LOG_LEVEL_ERROR, $res);
  
  
  
  return true;

• FFMpeg : how to blur two fixed regions at the bottom of the video file ?

  24 décembre 2022, par bully44

  I'm trying to blur to rectangular regions at the bottom of the video. Only short region around center should stay as it is, and 140 pixels regions on both sides should be blurred.
The left region is ok, but just cannot set correctly the right one. For visual reason, I'm displaying it higher, but I just cannot get x coordinate and size in correct position.

  


  ffmpeg -i Test1.mp4 -filter_complex  \
"[0:v]crop=iw/2-40:140:0:ih-140,avgblur=10[b0]; \
 [0:v]crop=iw/2-50:140:iw/2+200:ih-140,avgblur=5[b1]; \
 [0:v][b0]overlay=0:H-h[ovr0]; \
 [ovr0][b1]overlay=W/2+100:H-h-500" \
 -c:a copy -movflags +faststart Test_blur.mp4


  


  As FFMpeg newbie, I must be doing something obviously wrong.
Thanks in advance,
regards.

  


• FFMPEG H264 with custom overlay per frame

  4 octobre 2020, par La bla bla

  We have a stream that is stored in the cloud (Amazon S3) as individual H264 frames. The frames are stored as framexxxxxx.264, the numbering doesn't start from 0 but rather from some larger number, say 1000 (so, frame001000.264)

  


  The goal is to create a mp4 clip which is either timelapse or just faster for inspection and other checking (much faster, compressing around 3 hours of video down to < 20 minutes), this also requires we overlay the frame number (the filename) on the frame itself

  &#xA;

  At first I was creating a timelapse by pulling from S3 only the keyframes (i-frames ? still rather new to codecs & stuff) and overlaying the filename on them and saving as png (which probably isn't needed, but that's what I did) using (this command is used inside a python script)

  &#xA;

  ffmpeg -y -i {h264_name} -vf \"scale=1920:-1, 
drawtext=fontfile=/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-B.ttf:fontsize=34:text={txt}:fontcolor=white:x=50:y=50:bordercolor=black:borderw=2\" 
-c:a copy -pix_fmt yuv420p {basename}.png


  &#xA;

  after this I combined all the frames by using python to convert the lowest numbered frame to 0.png and incrementing (so it would be continuous, because I only used keyframes the numbers originally weren't sequential) and running

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  ffmpeg -y -f image2 -i %d.png -r {self.params.fps} -vcodec libx264 -crf {self.params.crf} -pix_fmt yuv420p {out_file}


  &#xA;

  and this worked great, but the difference between keyframes was too long to allow for proper inspection

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  so now for the question(s)

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  since I know frames that are not keyframes (p-frames ?) can't be used alone by ffmpeg, the method of overlaying the file name and converting it to png (or keep as h264, same thing) won't work, or at least, I couldn't find a way for it to work, maybe there's a way to specify a frame's keyframe ?, how can one overlay the filename (and not the frame number as shown here for example)

  &#xA;

  Also, is it possible to skip some p-frames between the keyframes ? (so if a keyframe is every 30 frames, we would take a keyframe, a frame 15 frames later, and next another keyframe)

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  I thought about using ffmpeg's pipe option to feed it with the files as they're being downloaded, but I'm not sure if I can specify drawtext this way

  &#xA;

  Also, if there's another alternative that can achieve that (at first I was converting to png, using python and OpenCV to add the filename and then merging the pngs to mp4, but then I found drawtext can do that in a single command so I used it)

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