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• FFMPEG command causing audio issues

  7 août 2018, par alan samuel

  I am converting multiple mp4 video to ts and then stitching it together.

  But this sometimes causes audio issues on my videos where the audio sounds like it was recorded with two mics at the same time causing loud sound.

  I can only reproduce it sometimes and I am still not sure why it’s doing that ? Can anyone help ?

  Here is how I am converting to ts from mp4. I have noticed that the longer the video gets, the audio gets worse and its also off by a couple of seconds.

  ffmpeg -i video1.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video1.ts
  
  
  
  ffmpeg -i video2.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video2.ts
  
  
  
  ffmpeg -i video3.mp4 -f lavfi -i anullsrc=channel_layout=mono:sample_rate=48000 -shortest -c copy -bsf:v h264_mp4toannexb -c:a aac video3.ts

  and then I save these paths to a txt and call my stitching command like this

  ffmpeg -f concat -safe 0 -i list.txt -c copy -bsf:a aac_adtstoasc finalvideo.mp4

  Here is the complete output of the 4 videos

  C:\Users\Alan\Desktop\videos>ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -i video4.mp4
  
  ffmpeg version N-90433-g5b31dd1c6b Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
  
    libavutil      56. 12.100 / 56. 12.100
  
    libavcodec     58. 15.100 / 58. 15.100
  
    libavformat    58. 10.100 / 58. 10.100
  
    libavdevice    58.  2.100 / 58.  2.100
  
    libavfilter     7. 13.100 /  7. 13.100
  
    libswscale      5.  0.102 /  5.  0.102
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:10.80, start: 0.000000, bitrate: 1034 kb/s
  
      Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 879 kb/s, 4.17 fps, 4.17 tbr, 12800 tbn, 8.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 165 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'video2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:01.62, start: 0.000000, bitrate: 3208 kb/s
  
      Stream #1:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 3203 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'video3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:05.58, start: 0.000000, bitrate: 1954 kb/s
  
      Stream #2:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1805 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 166 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'video4.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:03.90, start: 0.000000, bitrate: 1746 kb/s
  
      Stream #3:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1744 kb/s, 16.67 fps, 16.67 tbr, 12800 tbn, 33.33 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

• Using Hazel to execute ffmpeg (installed via Homebrew) script to convert video to .gif

  9 août 2018, par benbennybenben

  What I want to do is set Hazel to watch a folder for a new video that I create and then when matched, an embedded FFMPEG script converts the video into a gif.

  I have the matching criteria done,
  Hazel matching rules

  I have the ffmpeg recipe done,

  ffmpeg -ss 5.0 -t 2.5 -i $1 -r 15 -filter_complex "[0:v] fps=15, scale=500:-1, split [a][b];[a] palettegen [p]; [b][p] paletteuse" $1.gif

  But when I put the ffmpeg recipe in the "Embedded Script" dialogue box, I get an error when the match runs.

  2018-08-09 18:43:15.818 hazelworker[68549] [Error] Shell script failed: Error processing shell script on file /Users/bengregory/Scripts/khgfygfjhbvmnb.mp4.
  
  2018-08-09 18:43:15.818 hazelworker[68549] Shellscript exited with non-successful status code: -900

  I’m not sure if it’s relevant to mention that I’ve install ffmpeg via homebrew

  This is what the embedded shell script looks like
  ffmpeg embedded script

  I’ve been trying to get this to work for weeks and so far not found anything that helps. I read through this article on how to use handbrakeCLI, but no luck
  Hazel and HandbrakeCLI tutorial

  Any help would be greatly received ! Cheers

• FFMPEG error when making animations with certain frame dimensions

  10 août 2018, par jtam

  I have been using ffmpeg to successfully generate animations of png images with a size of 7205x4308 with the following command :

  -framerate 25 -f image2 -start_number 1 -i fig%4d.png -f mp4 -vf scale=-2:ih -vcodec libx264 -pix_fmt yuv420p 2015-2018.mp4

  When I try to run the same command for a group of images with a different size, e.g., 6404x5575, I get the following error :

  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

  I have concluded that the reason it is failing has something to do with the frame size because that is the only thing that is different between the first successful animation and the one that is failing. But, my intuition could be wrong(?). I have tried to remove the scaling parameter in the command but I get the same error.

  I am using ffmpeg version 3.4.2 on Mac OSX 10.13 via python.

  Any help would be much appreciated. Thanks !