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• FFmpeg producing a flickering video from images

  21 juin 2018, par jjohnn91

  So I’m trying to make a video of a fractal rotating through some values, much like seen here.

  I generate the frames (1000 of them) using a different program written in Java that works just fine, so for the purposes of this scenario assume that all the images are in the target folder and also in numerical order as they need to appear in the video.

  I found the following code on the web to stitch images into a video, and I haven’t the faintest idea how it works, and when I run it, all of the images are indeed stitched into a video and placed on the desktop, but the video appears to have one specific frame just jump in at random positions. I’m not totally sure which one, but its one of the earlier frames, somewhere between 1 and 200 of the 1000.

  I’ve also tested making two half videos, one using the first 500 frames, and the other using the second 500 frames. The first video (1 -> 500) has flickering, and the second video (501 -> 1000) appears not to have flickering to my observations.

  I am seeking help in fixing the flickering behavior, and I will upload the video file to google drive later if asked. The Images are all 1920x1080, and in proper numerical order.

  Thanks in advance !

  import static org.bytedeco.javacpp.opencv_imgcodecs.*;
  
  import java.io.File; 
  
  import org.bytedeco.javacpp.avcodec;
  
  import org.bytedeco.javacv.FFmpegFrameRecorder;
  
  import org.bytedeco.javacv.OpenCVFrameConverter;
  
  public class ImageToMovie{
  
      public static void main(String []args){
  
          String imgPath="C:\\Users\\John\\Images";
  
          String vidPath="C:\\Users\\John\\Desktop\\video.mp4";
  
          String[] links=new String[new File(imgPath).listFiles().length];
  
          File f=new File(imgPath);
  
          File[] f2=f.listFiles();
  
          for(int i=0;icode>

• Passing python's file like object to ffmpeg via subprocess

  3 juillet 2012, par tejinderss

  I have a django FileField, which i use to store wav files on the Amazon s3 server. I have set up the celery task to read that file and convert it to mp3 and store it to another FileField. Problem i am facing is that i am unable to pass the input file to ffmpeg as the file is not the physical file on the hard disk drive. To circumvent that, i used stdin to feed the input stream of the file with the django's filefield. Here is the example :

  output_file = NamedTemporaryFile(suffix='.mp3')
  
  subprocess.call(['ffmpeg', '-y', '-i', '-', output_file.name], stdin=recording_wav)

  where recording_wav file is : , which is actually stored on the amazon s3 server.
  The error for the above subprocess call is :

  AttributeError: 'cStringIO.StringO' object has no attribute 'fileno'

  How can i do this ? Thanks in advance for the help.

  Edit :

  Full traceback :

  [2012-07-03 04:09:50,336: ERROR/MainProcess] Task api.tasks.convert_audio[b7ab4192-2bff-4ea4-9421-b664c8d6ae2e] raised exception: AttributeError("'cStringIO.StringO' object has no attribute 'fileno'",)
  
  Traceback (most recent call last):
  
    File "/home/tejinder/envs/tmai/local/lib/python2.7/site-packages/celery/execute/trace.py", line 181, in trace_task
  
      R = retval = fun(*args, **kwargs)
  
    File "/home/tejinder/projects/tmai/../tmai/apps/api/tasks.py", line 56, in convert_audio
  
      subprocess.Popen(['ffmpeg', '-y', '-i', '-', output_file.name], stdin=recording_wav)
  
    File "/usr/lib/python2.7/subprocess.py", line 672, in __init__
  
      errread, errwrite) = self._get_handles(stdin, stdout, stderr)
  
    File "/usr/lib/python2.7/subprocess.py", line 1043, in _get_handles
  
      p2cread = stdin.fileno()
  
    File "/home/tejinder/envs/tmai/local/lib/python2.7/site-packages/django/core/files/utils.py", line 12, in <lambda>
  
      fileno = property(lambda self: self.file.fileno)
  
    File "/home/tejinder/envs/tmai/local/lib/python2.7/site-packages/django/core/files/utils.py", line 12, in <lambda>
  
      fileno = property(lambda self: self.file.fileno)
  
  AttributeError: &#39;cStringIO.StringO&#39; object has no attribute &#39;fileno&#39;
  
  </lambda></lambda>

• "Non-monotonous DTS in output stream" every 13 hours 14 minutes

  29 mars 2018, par Gnitry

  I have a problem with the latest ffmpeg from zeranoe.
  Every 13h14m ffmpeg stops recording.

  ffmpeg started on 2017-09-28 at 10:36:49
  
  Report written to "ffmpeg-20170928-103649.log"
  
  Command line:
  
  "D:\\ffmpeg\\ffmpeg.exe" -report
  
  ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Splitting the commandline.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Hyper fast Audio and Video encoder

  I record video streams from 3 cameras.

  Stream 1 :

  Input #0, rtp, from 'rtp://225.1.1.1:1024':
  
    Duration: N/A, start: 60424.501000, bitrate: N/A
  
    Program 1
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressiv
  
  e), 1920x1080 [SAR 1:1 DAR 16:9], 50 fps, 50 tbr, 90k tbn, 100 tbc
  
      Stream #0:1(eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, mono,
  
  fltp, 164 kb/s

  Streams 2,3 :

  Input #0, rtsp, from 'rtsp://192.168.3.36:554/stream1':
  
    Metadata:
  
      title           : Session streamed by "Pelco Streaming Server"
  
      comment         : stream1
  
    Duration: N/A, start: 0.219167, bitrate: N/A
  
      Stream #0:0: Video: h264 (Baseline), yuv420p(progressive), 640x480, 25 fps,
  
  25 tbr, 90k tbn, 50 tbc

  I record each of them with segmentation every 1 minute using separated ffmpeg instances like :

  ffmpeg -i "rtsp://192.168.3.36:554/stream1" -vcodec copy -an -f segment -strftime 1 -segment_time 60 "novus-%Y-%m-%d_%H-%M-%S.ts"

  Every 13 hours 14 minutes (from beginning of recording) each ffmpeg stops recording with messages like "Non-monotonous DTS in output stream 0:0". And it doesn’t matter when I started every ffmpeg intance : if I started instance №2 1 minute later that instance №1, it will stop recording in 1 minute after №1 accordingly. I tried it on two PC : Windows Server 2012 x64 and Windows 10 x64.

  ...
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289549528 pts_time:47661.7 dts:4289549528 dts_time:47661.7 -> pts:4289549528 pts_time:47661.7 dts:4289549528 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289553131 pts_time:47661.7 dts:4289553131 dts_time:47661.7 -> pts:4289553131 pts_time:47661.7 dts:4289553131 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556734 pts_time:47661.7 dts:4289556734 dts_time:47661.7 -> pts:4289556734 pts_time:47661.7 dts:4289556734 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 336 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535114, current: -5428580; changing to 4289535115. This may result in incorrect timestamps in the output file.
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556735 pts_time:47661.7 dts:4289556735 dts_time:47661.7 -> pts:4289556735 pts_time:47661.7 dts:4289556735 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535115, current: -5424977; changing to 4289535116. This may result in incorrect timestamps in the output file.
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556736 pts_time:47661.7 dts:4289556736 dts_time:47661.7 -> pts:4289556736 pts_time:47661.7 dts:4289556736 dts_time:47661.7
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535116, current: -5421374; changing to 4289535117. This may result in incorrect timestamps in the output file.
  
  [segment @ 000000000034e780] stream:0 start_pts_time:47640.5 pts:4289556737 pts_time:47661.7 dts:4289556737 dts_time:47661.7 -> pts:4289556737 pts_time:47661.7 dts:4289556737 dts_time:47661.7
  
  frame=1190370 fps= 25 q=-1.0 size=N/A time=13:14:21.50 bitrate=N/A speed=   1x    
  
  [NULL @ 000000000034a900] SEI type 5 size 408 truncated at 160
  
  [segment @ 000000000034e780] Non-monotonous DTS in output stream 0:0; previous: 4289535117, current: -5417772; changing to 4289535118. This may result in incorrect timestamps in the output file.
  
  ...

  The full debug log with this problem is here (25 Mb, zipped) :
  ​https://drive.google.com/file/d/0B1LIS8G55R7-OGY4QkdkQ0J1cVE/view?usp=sharing
  I can’t record video infinitely. Every 13 hours I have broken recording. I tried to record with "copytb 1", "genpts" but it doesn’t help. I don’t think it is the network problem, because I tried to record the same rtsp stream by two instances of ffmpeg with time shift of start : they stuck separately at separate time.
  Does anyone know how to solve it ? I can provide you with another information you need about this.

  Update : If I wait 13 hours after bug appeared, the recording starts again.