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• FFPLAY produces black video output [closed]

  28 January 2020, by RooterTooter

  I’m having an issue playing videos with ffplay on an embedded arm device (imx6). The OS is based on yocto sumo and uses the meta-freescale layers for imx6.

  I have a number of test videos in different formats that I am sure are formatted correctly (They play fine on my laptop with ffplay). FFMPEG has all the necessary codecs, detects my streams, it plays audio without an issue, but the video is just black.

  It’s worth nothing that I’m running X11 and have xterm running, and when ffplay is trying to play, a black box will pop up on the screen in the correct dimensions like it thinks it’s decoding video, but it’s always blank.

  $DISPLAY=:0 ffplay test.mp4
  
  ffplay version 3.3.3 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --disable-stripping --enable-pic --enable-shared --enable-pthreads --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-libxcb-shape --enable-nonfree --cross-prefix=arm-poky-linux-gnueabi- --ld='arm-poky-linux-gnueabi-gcc -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --cc='arm-poky-linux-gnueabi-gcc -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --cxx='arm-poky-linux-gnueabi-g++ -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --arch=arm --target-os=linux --enable-cross-compile --extra-cflags=' -O2 -pipe -g -feliminate-unused-debug-types -fdebug-prefix-map=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0=/usr/src/debug/ffmpeg/3.3.3-r0 -fdebug-prefix-map=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot-native= -fdebug-prefix-map=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot= -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --extra-ldflags='-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed' --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot --enable-hardcoded-tables --libdir=/usr/lib --shlibdir=/usr/lib --datadir=/usr/share/ffmpeg --disable-mipsdsp --disable-mipsdspr2 --cpu=cortex-a9 --pkg-config=pkg-config --enable-avcodec --enable-avdevice --enable-avfilter --enable-avformat --enable-avresample --enable-bzlib --enable-gpl --disable-libgsm --disable-indev=jack --disable-libvorbis --enable-lzma --disable-libmp3lame --enable-openssl --enable-postproc --disable-libschroedinger --enable-sdl2 --disable-libspeex --enable-swresample --enable-swscale --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvpx --enable-libx264 --enable-outdev=xv
  
    libavutil      55. 58.100 / 55. 58.100
  
    libavcodec     57. 89.100 / 57. 89.100
  
    libavformat    57. 71.100 / 57. 71.100
  
    libavdevice    57.  6.100 / 57.  6.100
  
    libavfilter     6. 82.100 /  6. 82.100
  
    libavresample   3.  5.  0 /  3.  5.  0
  
    libswscale      4.  6.100 /  4.  6.100
  
    libswresample   2.  7.100 /  2.  7.100
  
    libpostproc    54.  5.100 / 54.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':q=    0B f=0/0   
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.20.100
  
    Duration: 00:00:30.88, start: 0.000000, bitrate: 143 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x180, 67 kb/s, 21.08 fps, 21.08 tbr, 16192 tbn, 42.17 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 66 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  I’ve tried h264 and mp2 video with the same results. Has anyone seen this before

• chroma key my command for filter white background works but filter white and black?

  21 December 2018, by userpov

  ffmpeg    -i  bakground.avi   -i overlay.avi    -filter_complex       "[1:v]chromakey=0xFFFFFF:0.02:0[keyed];       [0:v][keyed]overlay[out]"    -map "[out]"    output.avi

  this command filter white and black

  I need filter only white color

  please help me

• Cutting HEVC video results in parts stating with no video (black image) but correct audio for a few seconds

  8 June 2020, by Oliver

  i have large HEVC video files and want to cut out parts of them. I use ffmpeg for that with the following command:

  



  ffmpeg -i input.mp4 -ss 01:18:47.040 -c:v copy -c:a copy -to 01:18:42.640 output.mp4


  



  i know that there can be problems when copy is used and no re-encoding, that is why i checked before that the frames specified in the -ss and -to parameters where keyframes (i-frames).

  



  So iam expecting to get a clean cut at the beginning and at the end. But what i get is 10 seconds of black image with normal audio in the beginning until the video starts. To make this clear: 10 seconds of video are missing in the beginning but the audio is fine.

  



  Btw: when moving the -ss part before the -i there seem to be no problems with the video (at least in the beginning). I know about the differences of putting -ss before and after the -i, but i also know, that using -ss after the -i should be slower (and was more accurate in the past) but should not make any differences in the final result. That is why I am so irritated.