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• FFMPEG Batch Encode resize without upscaling

  9 novembre 2016, par Alan

  I am working on a script that searches for all media files in the current directory and subdirectories and then batch encodes them to H265. I was hoping to put in some max frame sizes to make things that are 1080p to be 720p. That is the straightforward part but I have some that are 480p and I don’t want those to end up as 720p. How can I modify my ffmpeg filters to take that into account ?

  The script is run using the command

  find ./ -type f -regex ".*\.\(mkv\|mp4\|wmv\|flv\|webm\|mov\|avi\)" -print0 | xargs -0 /root/batch.sh

  /root/batch.sh

  #!/bin/bash
  
  for i; do
  
  filename=$(basename "$i")
  
  extension="${filename##*.}"
  
  filename="${filename%.*}"
  
      d=$(dirname "$i")
  
      ffmpeg -i "$i" -c:v hevc_nvenc -preset medium -crf 28 -c:a copy "$d/X265_$filename.mp4"
  
  done

• Increase fps in record video ffmpeg

  7 novembre 2016, par Badfishmaan

  I need to record 2 videos from 2 cameras in full hd 30 fps.
  I use ffmpeg and wrapper - Aforge for c#.

  init device :

          _videoCaptureDevice = new VideoCaptureDevice(deviceName);
  
          _videoCaptureDevice.VideoResolution = _videoCaptureDevice.VideoCapabilities[0];
  
          _videoCaptureDevice.DesiredFrameRate = _fps;
  
          _videoSourcePlayer.VideoSource = _videoCaptureDevice;
  
          _videoCaptureDevice.NewFrame += _videoCaptureDevice_NewFrame;
  
          _videoSourcePlayer.Start();

  saving frames

          if (_videoRecordStatus == VideoRecordStatus.Recording)
  
          {
  
              _videoFileWriter.WriteVideoFrame(eventArgs.Frame);
  
          }

  and init file writer

              _videoFileWriter = new VideoFileWriter();
  
              _videoFileWriter.Open(_fileName, _videoCaptureDevice.VideoResolution.FrameSize.Width,
  
                  _videoCaptureDevice.VideoResolution.FrameSize.Height, 30, VideoCodec.MPEG4, 10 * 1000 * 1000);

  now _videoCaptureDevice.VideoResolution.FrameSize equals 1280x720 and 640x480 (for second device). But I already have problems with recording. Maximum fps is 24 for 480p and 13-14 for 720p (when I try to record videos from 2 cameras in the same time)

  How to increase it ?
  Or it isn’t possible ? Maybe more powerfull computer will solve this problem (I have Pentium(R) Dual-Core CPU 2.50Ghz and usual videocart (Geforse 8500 GT) for working with two displays, usual hdd, usb 2.0) ?

  I will glad any help (maybe another library, but not language (c#))

  PS
  I already used Emgu.CV and faced with simular problems..

• ffmpeg failed to read header of audio file

  15 juillet 2016, par asad

  The file i am using (.m4a format) cant be read by ffmpeg. I can play this audio file in quicktime and vlc successfully. ffmpeg fails to read this particular file only. ffmpeg works with other .m4a files. Note:following works for this video too if i lower fps to 1 and resolution to 480p Following is the log :

  ffmpeg version N-80097-g89e9393 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
    configuration: --prefix=/home/ec2-user/ffmpeg_build --extra-cflags=-I/home/ec2-user/ffmpeg_build/include --extra-ldflags=-L/home/ec2-user/ffmpeg_build/lib --bindir=/home/ec2-user/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 43.100 / 57. 43.100
  
    libavformat    57. 37.100 / 57. 37.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 46.100 /  6. 46.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, rawvideo, from 'pipe:0':
  
    Duration: N/A, start: 0.000000, bitrate: 314818 kb/s
  
      Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 854x480, 314818 kb/s, 24 tbr, 24 tbn
  
  Input #1, png_pipe, from '/home/ec2-user/logo-watermark-green_tpd.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0: Video: png, rgba(pc), 287x185, 25 tbr, 25 tbn
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x3b71d00] error reading header
  
  /home/ec2-user/decryptedData/audios/Blrt_Decrypt_tfss-29882287-c1d5-4c54-b674-87e9de4a9e38-audio.m4a: Invalid data found when processing input
  
  "rjRoYZaDA1_854x480@24fps_1468547071.txt"

  Following is the code :

  /home/ec2-user/bin/ffmpeg \
  
  -framerate 24 -f rawvideo -pixel_format rgb32 -video_size 854x480 -i pipe:0 \
  
  -i /home/ec2-user/logo-watermark-green_tpd.png \
  
  -i /home/ec2-user/decryptedData/audios/Blrt_Decrypt_tfss-29882287-c1d5-4c54-b674-87e9de4a9e38-audio.m4a \
  
  -filter_complex "[0:v]vflip[main];[1:v]scale=854/10:-1[si], \
  
  [main][si]overlay=main_w-overlay_w:main_h-overlay_h:format=rgb,format=yuv420p" \
  
  -c:v libx264 \
  
  -c:a copy /home/ec2-user/videos/rjRoYZaDA1_854x480@24fps_1468563244030.mp4 \
  
  2> /home/ec2-user/logs/rjRoYZaDA1_854x480@24fps_1468563244.txt

  Please let me know what can possibly be done ?