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• ffmpeg Command in exec()

  30 octobre 2014, par Kevinkuijer

  I Cant get this command working in exec()

  ffmpeg -i ../uploads/".$row['videoid'].".".$row['van']." -filter_complex \
  
  "[0:a]showwaves=s=1280x720:mode=line:rate=25,format=yuv420p[vid]" -map "[vid]" -map 0:a \
  
  -codec:v libx264 -crf 18 -preset fast -codec:a aac -strict -2 -b:a 192k ../uploads/mp4sd/".$row['videoid'].".mp4

  How do i place this in exec() ?

  This is not working :

  exec(ffmpeg -i ../uploads/".$row['videoid'].".".$row['van']." -filter_complex \
  
  "[0:a]showwaves=s=1280x720:mode=line:rate=25,format=yuv420p[vid]" -map "[vid]" -map 0:a \
  
  -codec:v libx264 -crf 18 -preset fast -codec:a aac -strict -2 -b:a 192k ../uploads/mp4sd/".$row['videoid'].".mp4);

  

• ffmpeg command to combine audio and images

  4 février 2013, par jeet

  I'm trying to achieve something which I earlier thought should be a simple task.
  Is there a ffmpeg command that can do the following :

  convert an audio.wav file to a video,
  Add some 100 pics (img%d.png) to the video so they "automatically" stretch to fill the entire length of the video.

  I don't want to set the frame rate manually because it's either making the audio go ahead or lack behind.

  I also don't want the following to happen, which happenned when I used "loop_input" :

  A short video of images got created, which played fast and then repeated itself for the entire duration of the audio.

  Please let me know the command.

  I've currently tried the following, but these are not giving me the desired results :

  This one makes, but video goes fast and audio is not full :

  ffmpeg -i img%d.png -i audio.wav -acodec copy output.mpg

  This one makes short video which repeats for full audio duration :

  ffmpeg -loop_input -shortest -i img%d.png -i audio.wav -acodec copy output.mpg

  This one works nearly, but "-r 4" makes video go slow and audio goes ahead. If I use "-r 5" then audio goes slow, and video goes ahead :

  ffmpeg -r 4 -i img%d.png -i audio.wav -acodec copy -r 30 output.mpg

• Why does hard-coding subtitles into MKV cause resulting video length to be wildly incorrect ?

  21 mai 2018, par BudJB

  I am trying to encode an existing MKV with a video, audio, and several subtitle streams, such that video encodes with H264, audio encodes with AAC, and the second subtitle track is hard-coded into the video stream. I am using the myffmpeg GUI frontend, but can view and modify the ffmpeg command before it’s run.

  Every time that I run the encode, the MKV reports that the duration is 1195 hours and change, where it’s supposed to be around 2 hours, plus some change. If I encode without the hard-coded subtitles, things turn out alright.

  Here’s the command that’s run, with the latest ffmpeg :

  ffmpeg.exe -probesize 50M -analyzeduration 100M -i "D:\Video\in.mkv" -c:a aac -ac 6 -strict -2 -async 1 -c:v libx264 -crf 20 -r 24000/1001 -s 1920x1080 -aspect 16:9 -pix_fmt yuv420p -preset fast -partitions default  -b-pyramid 1 -weightb 1 -8x8dct 1 -fast-pskip 0 -direct-pred 1 -coder ac -trellis 1 -me_method hex -subq 6 -me_range 16 -bf 3 -b_strategy 1 -refs 3 -flags +loop -sws_flags fast_bilinear -sc_threshold 40 -keyint_min 24 -g 48 -qmin 3 -qmax 51 -qdiff 4 -filter_complex "[0:v][0:s:2]overlay[out]" -map [out]  -map 0:a:0 -sn -y "D:\Video\out.mkv"

  I’ve tried a couple other MKV’s with the same results. Anyone else run into this or know what’s going on ?