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• ffmpeg read from a file and apply filter_complex at once

  30 janvier 2020, par AlexZheda

  I am feeding fls.txt into ffmpeg -i and applying concat and a speedup.

  fls.txt

  file 'input1.mp4'
  
  file 'input2.mp4'
  
  file 'input3.mp4'

  The command in one go looks as follows :

  ffmpeg  -i fls.txt     \
  
  -filter_complex "[0:v][0:a][1:v][1:a][2:v][2:a] concat=n=3:v=1:a=1 [v][a];\
  
  [v]setpts=0.5*PTS[v1];[a]atempo=2,asetpts=N/SR/TB[a1]"     \
  
  -c:v h264_nvenc -map "[v1]" -map "[a1]"  x2.mp4

  The output is really weird and says something like a stream is not found. And it also looks like as if it’s trying to understand the fls.txt itself and not its content as the parameters.
  What am I doing wrong here and how can I correct it ?
  Also, it’s a simplified example and I cannot write per hand 3 input file paths. I need it to be read from a file. I’m on windows 10 if that matters.

  EDIT :
  From doing the suggested edits and expanding the -filter_complex I get an error below.

  ffmpeg -f concat -safe 0 -i fls.txt     \
  
  -filter_complex "[0:v]setpts=0.5*PTS[v1];[v1]setpts=0.5*PTS[v2];[0:a]atempo=2,asetpts=N/SR/TB[a1];[a1]atempo=2,asetpts=N/SR/TB[a2]"     \
  
  -c:v h264_nvenc -map "[v1]" -map "[a1]" x2.mp4 \
  
  -c:v h264_nvenc -map "[v2]" -map "[a2]" x4.mp4

  error :

  Output with label 'v1' does not exist in any defined filter graph, or was already used elsewhere.

• FFmpeg android video processing does not return error message

  25 août 2018, par Дмитрий Мельчин

  friends. I am creating a program that puts the sound and picture to video. I’m using the ffmpeg library https://github.com/bravobit/FFmpeg-Android.
  The command looks like this :

  String command = "-i /data/user/0/com.radpony.vhs.camcorder/files/RADVHS/camcorder_video.mp4 -i /data/user/0/com.radpony.vhs.camcorder/files/RADVHS/watermark_png.png -i /data/user/0/com.radpony.vhs.camcorder/files/RADVHS/playarrow.png -filter_complex [0]crop=720:720[croped];[1]scale=w=143:h=50[tmp];[croped][tmp]overlay=x=577:y=10[overlayed];[overlayed][2]overlay=x=150:y=10[overlayed2];[overlayed2]drawtext=fontfile=/data/user/0/com.radpony.vhs.camcorder/cache/VCR_OSD_MONO_1_001.ttf:text='PM 11\:06Aug..25 2018':fontcolor=white:fontsize=48:x=50:y=600[withdate];[withdate]drawtext=fontfile=/data/user/0/com.radpony.vhs.camcorder/cache/VCR_OSD_MONO_1_001.ttf:text='Play':fontcolor=white:fontsize=48:x=50:y=30 -codec:a copy -c:v libx264 -preset ultrafast /data/user/0/com.radpony.vhs.camcorder/files/RADVHS/rendered_video.mp4";

  It works great for Android 6, but on the Samsung devices with Android 7 while processing of video ffmpeg just stops without displaying an error message.
  If someone knows the solution to this problem, help, please

• FFmpeg IF/ELSE statement

  13 mai 2022, par Hrvoje

  I am doing reencoding of lots of video files, and sometimes some of them have subtitles included, some dont. Is it possible to "ignore"
-vf "subtitles=%%f:force_style='MarginV=25,Fontsize=20'" -sn statement in FFmpeg command IF input file does not have subtitles included ?

  


  My command is :

  


  for %%f in (*.mkv) do ffmpeg -hwaccel nvdec -i "%%f" -strict -2 -max_muxing_queue_size 1024 -map_metadata -1 -map_chapters -1 -vf "subtitles=%%f:force_style='MarginV=25,Fontsize=20'" -sn -c:v hevc_nvenc -rc vbr -cq 24 -qmin 24 -qmax 24 -tier high -level 4 -preset medium -profile:v main10 -pix_fmt p010le -b:v 0K -ac 6 -ar 48000 -b:a:0 640k -c:a:0 ac3 -metadata:s:a:0 title="Dolby Digital" E:\Encoded\%%f


  


  Note that there are more than 100 files in a batch and checking them by hand is time consuming.

  


  Maybe right aproach is to first inspect file in a batch script and if that file has subtitles, then execute first command, if it does not have subtitles, execute second command. But, I dont know how to do a script like that.