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• FFmpeg Dropping Aspect Ratio on FLV Output

  16 septembre 2017, par Mike B

  I am having an issue with FFmpeg dropping the aspect ratio when converting a 1920x1080 stream to a lower resolution (please see below for more information). The objective is to take the output from TVHeadend and convert it to a FLV format that I can stream outside of my house.

  ffmpeg -c:v mpeg2_mmal -i http://192.168.1.142:9981/stream/channelnumber/10.1?profile=pass -c:a libfdk_aac -profile:a aac_he_v2 -b:a 32k -ac 2 -async 48000 -c:v h264_omx -b:v 1800k -sws_flags fast_bilinear -vf scale=720:540 -keyint_min 0 -g 100 -f flv rtmp://192.168.1.110:1935/live/test

  This produces the following onscreen output :

  Output #0, flv, to 'rtmp://192.168.1.110:1935/live/test':
  
    Metadata:
  
      encoder         : Lavf57.82.100
  
      Stream #0:0: Video: h264 (h264_omx) ([7][0][0][0] / 0x0007), yuv420p, 720x540 [SAR 4:3 DAR 16:9], q=2-31, 1800 kb/s, 29.97 fps, 1k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.105.100 h264_omx
  
      Stream #0:1(eng): Audio: aac (libfdk_aac) (HE-AACv2) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, s16, 32 kb/s
  
      Metadata:
  
        encoder         : Lavc57.105.100 libfdk_aac

  Based on the onscreen output, it appears that that SAR and DAR are correct. It is only when you examine the actual files that the aspect ratio has been dropped.

  Input #0, hls,applehttp, from 'http://192.168.1.110:8080/live/test/index.m3u8':
  
    Duration: N/A, start: 109.116000, bitrate: N/A
  
    Program 0 
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 720x540, 29.97 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:1: Audio: aac (HE-AACv2) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
  
      Metadata:
  
        variant_bitrate : 0

  I modified the command to instead save to a local MP4 file :

  ffmpeg -c:v mpeg2_mmal -i http://192.168.1.142:9981/stream/channelnumber/10.1?profile=pass -c:a libfdk_aac -profile:a aac_he_v2 -b:a 32k -ac 2 -async 48000 -c:v h264_omx -b:v 1800k -sws_flags fast_bilinear -vf scale=720:540 -keyint_min 0 -g 100 ~/test.mp4

  And the issue is resolved. I have also tried adding the video filters setsar and setdar to no avail.

  I am performing this on a Raspberry Pi 3, which lacks the ability to de-interlace in hardware. To remedy this, I am simply scaling the video vertically by 1/2. I have tried scaling the output to 960x540 but the Pi has issues keeping up.

• avcodec/hevcdec : fix non-ref frame judgement

  23 octobre 2018, par Mark Wu

  avcodec/hevcdec : fix non-ref frame judgement
  After inspecting the source code of x265, mpv and ffmpeg, I've found that
  
  ffmpeg mistakenly regards EVC_NAL_BLA_N_LP and HEVC_NAL_IDR_N_LP as non-
  
  reference frames, which are acutally reference frames according to the
  
  specification in x265, and drops them.
  This patch should address the problem. I have tested it with mpv.
  Signed-off-by : Mark Wu <wfwf1997@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/hevcdec.h

• Invalid CFBundleSupportedPlatforms value iPhoneSimulator in (DJIWidget) FFmpeg.framework

  10 mai 2022, par Brien Crean

  I cannot upload my app which contains the DJI-SDK, DJIWidget(which contains FFMpeg) to Testflight after updating to Xcode 13. When I try I get :

  


  


  Invalid CFBundleSupportedPlatforms value. The
CFBundleSupportedPlatforms key in the Info.plist file in
“Payload/app.app/Frameworks/FFmpeg.framework” bundle contains an
invalid value, [iPhoneSimulator]. Consider removing the
CFBundleSupportedPlatforms key from the Info.plist file. If this
bundle is part of a third-party framework, consider contacting the
developer of the framework for an update to address this issue. With
error code STATE_ERROR.VALIDATION_ERROR.90542 for id
f2327257-ad48-4b60-8fc8-a518da5fbac8

  


  


  # relevant pods
pod 'DJI-SDK-iOS', '~> 4.16'
pod 'DJIWidget', '~> 1.6.6'


  


  However FFMpeg seems to be a binary file Framework attached to DJIWidget so I can't edit the Info.plist directly. Is there any way to workaround this or do I have to reach out to the DJI to actually make a change ?