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• How can i parse strings as the inputs to subprocess.Popen ?

  26 juillet 2013, par rash

  Here I tried to cut first and second 30sec long video file from "path/connect.flv" to the files output1.flv and output2.flv. It works. I able to concatenate these two files to form a new file "final.flv" of 60sec long. So this works and i am getting the outputs output1.flv [30sec], output2.flv[30sec] and final.flv[1min].

  Here is the python code :

  import subprocess
  
  
  
  ffmpeg_command1 = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:00", "-t", "00:00:30", "/home/xincoz/test/output1.flv"]
  
  
  
  ffmpeg_command2 = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:30", "-t", "00:00:30", "/home/xincoz/test/output2.flv"]
  
  
  
  ffmpeg_command3 = ["mencoder", "-forceidx", "-ovc", "copy", "-oac", "pcm", "-o", "/home/xincoz/test/final.flv", "/home/xincoz/test/output1.flv", "/home/xincoz/test/output2.flv"]
  
  
  
  subprocess.call(ffmpeg_command1)
  
  
  
  subprocess.call(ffmpeg_command2)
  
  
  
  subprocess.Popen(ffmpeg_command3)

  But what i really want is to concatenate two strings out1 and out2 and concatinate these two to a file instead of concatenating "/home/xincoz/test/output1.flv" and "/home/xincoz/test/output2.flv". So how can i parse string out1 and out2 as the inputs to mencoder ? Please edit my code to achieve the result.

  import subprocess,os
  
  
  
  ffmpeg_command = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:00", "-t", "00:00:30","-f", "flv", "pipe:1"]
  
  
  
  p = subprocess.Popen(ffmpeg_command,stdout=subprocess.PIPE)
  
  
  
  out1, err = p.communicate()
  
  
  
  ffmpeg_command1 = ["ffmpeg", "-i", "/home/xincoz/test/connect.flv", "-acodec", "copy", "-ss", "00:00:30", "-t", "00:00:30","-f", "flv", "pipe:1"]
  
  
  
  p1 = subprocess.Popen(ffmpeg_command1,stdout=subprocess.PIPE)
  
  
  
  out2, err1 = p1.communicate()
  
  
  
  ffmpeg_command2 = ["mencoder", "-forceidx", "-ovc", "copy", "-oac", "pcm", "-o", "/home/xincoz/test/final.flv", out1, out2 ]
  
  
  
  p2=subprocess.Popen(ffmpeg_command2)

  Please help me. Thanks a lot in advance.

• FFMPEG concat causing audio glitches in segments boundaries

  28 mai 2017, par Idan

  I am segmenting a video file to 10sec segments, transcoding each of them and then run a concat to merge them all back together.
  While the whole process works without errors and the final file is valid and playable, I’ve noticed some sort of glitches/interruptions in the audio stream when passing over the original segments boundaries.

  For example, in a 60sec video that was segmented to 10sec segments and stitched back again, the final output will show audio interruptions in 10/20/30/40/50 sec timestamps.

  For segmenting the files I use :

  ffmpeg -y -i $INPUT_FILE -c copy -flags -global_header -segment_time 10 -break_non_keyframes 0 -reset_timestamps 1 -segment_list file_segs.list -segment_list_type ffconcat -write_empty_segments 0 -segment_format mp4  -f segment file_seg-%d.mp4

  And for concat I use :

  ffmpeg -y -f concat -i file_segs.list -c copy -movflags +faststart file_video.mp4

  Transcoding is to libx264 / aac

  What might be the cause ? Is there any way to work around this problem ?

• FFMPEG -filter_complex is not generating desired output

  24 octobre 2017, par Mubbashar

  I am trying to
  embed subtitle at the bottom of video and
  add image/text watermark at the top right corner of video and
  add text at the top and bottom and
  add colored padding at top and bottom of video in the same command

  This following is the command I can get somewhat working. This is adding padding at the bottom but not at the top. It is successfully embedding subtitles in the video though.
  It is also disturbing some parts of the video, pushing them to the top and cropping the top of video (because of padding at the bottom I think) but some parts of the video are in place and are ok.

  I tried to write the command and use filter complex in FFMPEG but i am not sure how to use them correctly. Can somebody guide how to fix this and use filter complex correctly as documentation is too complex

  COMMAND

  ffmpeg -y -i video-orignal.mp4 -i watermark.jpg -filter_complex "[0:v]pad=iw:ih+300:0:0:purple[padded]; [padded]overlay=main_w-overlay_w-5:5[watermarked]; [0:v][watermarked]overlay=W-w-10:H-h-10,subtitles=subtitles-final.ass[out]" -map "[out]" -map 0:a video-final.mp4