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• Using ffmpeg to overlay black line or add border to two side by side videos

  14 février 2020, par user3135427

  I am using the following to generate a video that is side by side.

  ffmpeg -i left.mp4 -i right.mp4 -filter_complex "[0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; [1:v]setpts=PTS-STARTPTS[fg]; [bg][fg]overlay=w" -y final.mp4
  

  It looks like this.

  http://www.mo-de.net/d/partnerAcrobatics.mp4

  I would like to place a vertical black line on top right in the middle or add a black border to the video on the left. If I add a border to the left video I would like to maintain the original sum dimension of the original videos. This solution would require subtracting the border width from the left videos width. I will take either solution.

  Thanks

• Array of Bitmaps into Video with ffmpeg

  14 février 2020, par Steve Jobs Kappa

  I'm Facing current porblem. I have an Array of 100 Bitmaps. these are Screenshots i took from a view. I used JCodec to make it to a video, buts its waay to slow. Im hoping to get better results with FFmpeg

  Now i want to use the FFmpeg Library. Simillar questions were asked but i have no Idea how to use ffmpeg and how i have to use it in my specific case. All i see are weird Complex Commands See:

   File dir = your directory where image stores;
      String filePrefix = "picture"; //imagename prefix
      String fileExtn = ".jpg";//image extention
      filePath = dir.getAbsolutePath();
      File src = new File(dir, filePrefix + "%03d" + fileExtn);// image name should ne picture001, picture002,picture003 soon  ffmpeg takes as input valid
  

  complexCommand = new String[]{"-i", src + "", "-c:v", "libx264", "-c:a", "aac", "-vf", "setpts=2*PTS", "-pix_fmt", "yuv420p", "-crf", "10", "-r", "15", "-shortest", "-y", "/storage/emulated/0/" + app_name + "/Video/" + app_name + "_Video" + number + ".mp4"};

  The Problem is, that in this case he is using a Path. I need it to be from an Array. And i have no idea what to do with the String (ComplexCommands) :/ My Bitmaps are like this:

  Bitmap[] bitmaps = new Bitmaps[100];

  this is filled later on.

  if anyone is searching on how to do it with JCodec:

   try {
                      out = NIOUtils.writableFileChannel( Environment.getExternalStorageDirectory().getAbsolutePath()+"/***yourpath***/output"+System.currentTimeMillis()+".mp4");
                      // for Android use: AndroidSequenceEncoder
  
                      AndroidSequenceEncoder encoder = new AndroidSequenceEncoder(out, Rational.R(25, 1));
                      for (int i = 0 ; i < 100 ; i++) {
                          // Generate the image, for Android use Bitmap
  
                          // Encode the image
                          System.out.println("LOO2P"+i);
                          encoder.encodeImage(bitmaps[i]);
                      }
                      // Finalize the encoding, i.e. clear the buffers, write the header, etc.
                      encoder.finish();
  
                  } catch (FileNotFoundException e) {
                      System.out.println("fNF");
                      e.printStackTrace();
  
                  } catch (IOException e) {
                      System.out.println("IOE");
                      e.printStackTrace();
                  } finally {
                      System.out.println("IOSSE");
                      NIOUtils.closeQuietly(out);
                  }
  

• Read a Bytes image from Amazon Kinesis output in python

  14 février 2020, par Varun_Rathinam

  I used imageio.get_reader(BytesIO(a), 'ffmpeg') to load a bytes image and save it as normal image.

  But the below error throws when I read the image using imageio.get_reader(BytesIO(a), 'ffmpeg')

  Traceback (most recent call last):
    File "", line 1, in 
    File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/functions.py", line 186, in get_reader
      return format.get_reader(request)
    File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/format.py", line 164, in get_reader
      return self.Reader(self, request)
    File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/core/format.py", line 214, in __init__
      self._open(**self.request.kwargs.copy())
    File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 323, in _open
      self._initialize()
    File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 466, in _initialize
      self._meta.update(self._read_gen.__next__())
    File "/home/tango/anaconda3/lib/python3.6/site-packages/imageio_ffmpeg/_io.py", line 150, in read_frames
      raise IOError(fmt.format(err2))
  OSError: Could not load meta information
  === stderr ===
  
  ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
    built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
    configuration: --prefix=/home/tango/anaconda3 --cc=/home/conda/feedstock_root/build_artifacts/ffmpeg_1566210161358/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-libx264 --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame
    libavutil      56. 31.100 / 56. 31.100
    libavcodec     58. 54.100 / 58. 54.100
    libavformat    58. 29.100 / 58. 29.100
    libavdevice    58.  8.100 / 58.  8.100
    libavfilter     7. 57.100 /  7. 57.100
    libavresample   4.  0.  0 /  4.  0.  0
    libswscale      5.  5.100 /  5.  5.100
    libswresample   3.  5.100 /  3.  5.100
    libpostproc    55.  5.100 / 55.  5.100
  [matroska,webm @ 0x5619b9da3cc0] File ended prematurely
  [matroska,webm @ 0x5619b9da3cc0] Could not find codec parameters for stream 0 (Video: h264, none, 1280x720): unspecified pixel format
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  Input #0, matroska,webm, from '/tmp/imageio_zm6hhpgr':
    Metadata:
      title           : Kinesis Video SDK
      encoder         : Kinesis Video SDK 1.0.0
      AWS_KINESISVIDEO_FRAGMENT_NUMBER: 91343852333183888465720004820715065721442989478
      AWS_KINESISVIDEO_SERVER_TIMESTAMP: 1580791384.096
      AWS_KINESISVIDEO_PRODUCER_TIMESTAMP: 1580791377.843
    Duration: N/A, bitrate: N/A
      Stream #0:0(eng): Video: h264, none, 1280x720, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn, 2k tbc (default)
      Metadata:
        title           : kinesis_video
  Stream mapping:
    Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  Press [q] to stop, [?] for help
  Cannot determine format of input stream 0:0 after EOF
  Error marking filters as finished
  Conversion failed!
  

  The above approach to read a MKV bytes file was done based on this thread

  Or is there is any approach to parse and read the MKV bytes file.

• How to ignore the other output streams if failed in ffmpeg ?

  14 février 2020, par geo-freak

  I have an input video. I take the input and encode the video, and encode all the audio channels in it in a single command. I get 5.1 audio and sometimes stereo audio(once in a day randomly) from the live input. I use the following command to encode all the streams.

  ffmpeg -i input.ts -c:v libx264 -c:a libfdk_aac -y output.m3u8 \
    -vn -map_channel 0.1.0 -c:a libfdk_aac -ac 1 -y channel1.m3u8 \
    -vn -map_channel 0.1.1 -c:a libfdk_aac -ac 1 -y channel2.m3u8 \
    -vn -map 0:2 -c:a libfdk_aac -ac 1 -y channel3.m3u8 \
    -vn -map_channel 0.2.0 -c:a libfdk_aac -ac 1 -y channel4.m3u8 \
    -vn -map_channel 0.2.1 -c:a libfdk_aac -ac 1 -y channel5.m3u8 \
    -vn -map 0:3 -c:a libfdk_aac -ac 1 -y channel6.m3u8 \
    -vn -map_channel 0.3.0 -c:a libfdk_aac -ac 1 -y channel7.m3u8 \
    -vn -map_channel 0.3.1 -c:a libfdk_aac -ac 1 -y channel8.m3u8 -v verbose
  

  Sometimes my whole encoding command is failing due to the sudden change in the audio layout(5.1 to stereo) for a particular hour. I don't want my encoding command to stop, I need the main video output.m3u8(video file) however the audio layout is. Can I ignore the other encodings by using any options if they failed? I have seen the option onfail in ffmpeg documentation. I tried using that in my command, but I failed. Below is the command I used.

  ffmpeg -i input.ts -c:v libx264 -c:a libfdk_aac -y output.m3u8 
    -vn -map_channel 0.1.0 -c:a libfdk_aac -ac 1 -y channel1.m3u8 
    -vn -map_channel 0.1.1 -c:a libfdk_aac -ac 1 -y channel2.m3u8 
    -f "[f=mpegts:onfail=ignore] -vn -map 0:2 -c:a libfdk_aac -ac 1 -y channel3.m3u8" 
    -f "[f=mpegts:onfail=ignore] -vn -map_channel 0.2.0 -c:a libfdk_aac -ac 1 -y channel4.m3u8" 
    -f "[f=mpegts:onfail=ignore] -vn -map_channel 0.2.1 -c:a libfdk_aac -ac 1 -y channel5.m3u8" 
    -f "[f=mpegts:onfail=ignore] -vn -map 0:3 -c:a libfdk_aac -ac 1 -y channel6.m3u8" 
    -f "[f=mpegts:onfail=ignore] -vn -map_channel 0.3.0 -c:a libfdk_aac -ac 1 -y channel7.m3u8" 
    -f "[f=mpegts:onfail=ignore] -vn -map_channel 0.3.1 -c:a libfdk_aac -ac 1 -y channel8.m3u8" 
    -f "[f=mpegts:onfail=ignore] -vn -map 0:3.1 -c:a libfdk_aac -ac 1 -y channel6.m3u8" -v verbose
  

  When I give the input video with 5.1 audio, the above command worked, but only for the first 3 outputs. It is totally ignoring all the remaining outputs even if they work. It is not bothering about the result of the outputs.

  My question is how to use that onfail option to ignore if one of the outputs failed?

• FFprob time stimstempt

  14 février 2020, par user12129980

  I got this results:

  `media_type=video|stream_index=0|key_frame=1|pkt_pts=4004|pkt_pts_time=0.066733|pkt_dts=4004|pkt_dts_time=0.066733|best_effort_timestamp=4004|best_effort_timestamp_time=0.066733|pkt_duration=N/A|pkt_duration_time=N/A|pkt_pos=247781|pkt_size=3110400|width=1920|height=1080|pix_fmt=yuv420p|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0|color_range=unknown|color_space=unknown|color_primaries=unknown|color_transfer=unknown|chroma_location=unspecified|tag:lavfi.scene_score=0.441274

  media_type=video|stream_index=0|key_frame=1|pkt_pts=9009|pkt_pts_time=0.150150|pkt_dts=9009|pkt_dts_time=0.150150|best_effort_timestamp=9009|best_effort_timestamp_time=0.150150|pkt_duration=N/A|pkt_duration_time=N/A|pkt_pos=278961|pkt_size=3110400|width=1920|height=1080|pix_fmt=yuv420p|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0|color_range=unknown|color_space=unknown|color_primaries=unknown|color_transfer=unknown|chroma_location=unspecified|tag:lavfi.scene_score=0.639635

  media_type=video|stream_index=0|key_frame=1|pkt_pts=63063|pkt_pts_time=1.051050|pkt_dts=63063|pkt_dts_time=1.051050|best_effort_timestamp=63063|best_effort_timestamp_time=1.051050|pkt_duration=N/A|pkt_duration_time=N/A|pkt_pos=1741936|pkt_size=3110400|width=1920|height=1080|pix_fmt=yuv420p|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0|color_range=unknown|color_space=unknown|color_primaries=unknown|color_transfer=unknown|chroma_location=unspecified|tag:lavfi.scene_score=0.477124

  media_type=video|stream_index=0|key_frame=1|pkt_pts=142142|pkt_pts_time=2.369033|pkt_dts=142142|pkt_dts_time=2.369033|best_effort_timestamp=142142|best_effort_timestamp_time=2.369033|pkt_duration=N/A|pkt_duration_time=N/A|pkt_pos=5345789|pkt_size=3110400|width=1920|height=1080|pix_fmt=yuv420p|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0|color_range=unknown|color_space=unknown|color_primaries=unknown|color_transfer=unknown|chroma_location=unspecified|tag:lavfi.scene_score=0.386543 `

  I try to understand that, for my understanding best_effort_timestamp=4004 represent the boundary of the first shot, but what 4004 represents? milisecond? microsecond?