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• ffmpeg show wrong with/height of video

  6 mai 2020, par boygiandi

  I have this video : https://media.gostream.co/uploads/gostream/9wkBeGM7lOfxT902V86hzI22Baj2/23-4-2020/videos/263a34c5a2fe61b33fe17e090893c04e-1587640618504_fs.mp4

  



  When I play it on Google Chrome, it's vertical video. But when I check with ffmpeg

  



  ffmpeg -i "https://media.gostream.co/uploads/gostream/9wkBeGM7lOfxT902V86hzI22Baj2/23-4-2020/videos/263a34c5a2fe61b33fe17e090893c04e-1587640618504_fs.mp4"


  



  It show video dimensions are 1080x1080

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.35.101
  Duration: 00:00:39.51, start: 0.000000, bitrate: 1577 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1080 [SAR 9:16 DAR 9:16], 1464 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified


  



  And when I livestream this video to Facebook, it scaled vertical video into square form : https://imgur.com/a/A8dQ7j7

  



  How can I correct video size when livestream ?

  


• Why Do Some of the Codecs in FFMPEG's Supported Codec List Show "encoders :" or "decoders :" in Parenthesis ?

  4 mai 2020, par spaceman

  If you open the Command Prompt, and run ffmpeg -codecs,
  
you will get a long list of Codecs that FFMPEG supports.

  



  Here's a small sample of the list :

  



   DEV.L. h261                 H.261
 DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
 D.V.L. h263i                Intel H.263
 DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)
 D.V.LS hevc                 H.265 / HEVC


  



  Now If you briefly go over the whole list,
  
you see that most Codecs in this list appear with their Name and Description,
  
but some of the Codecs also include parenthesis in the Description, and in the parenthesis,
  
they specify "encoders :" or "decoders :".

  



  For example :

  



  1)

  



   DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (encoders: libx264 libx264rgb)


  



  2)

  



   DEVILS jpeg2000             JPEG 2000 (decoders: jpeg2000 libopenjpeg) (encoders: jpeg2000 libopenjpeg)


  



  3)

  



   DEV.L. msmpeg4v3            MPEG-4 part 2 Microsoft variant version 3 (decoders: msmpeg4) (encoders: msmpeg4)


  



  4)

  



   DEA.L. aac                  AAC (Advanced Audio Coding) (encoders: aac libvo_aacenc)


  



  5)

  



   DEA.L. amr_nb               AMR-NB (Adaptive Multi-Rate NarrowBand) (decoders: amrnb libopencore_amrnb) (encoders: libopencore_amrnb)
 DEA.L. amr_wb               AMR-WB (Adaptive Multi-Rate WideBand) (decoders: amrwb libopencore_amrwb) (encoders: libvo_amrwbenc)


  



  My question :

  



  Why do some Codecs have those parenthesis, specifying Encoders/Decoders,
  
while other (in fact : most) codecs don't have these parenthesis ?

  


• FFMPEG encoded mp4 video don't show video frames but audio is fine [duplicate]

  29 avril 2020, par ark1974

  Trying on converting an mp3 audio and a jpeg image as background image into a mp4 video, video conversion should terminate after it reaches the audio play length.

  



  Here's the ffmpeg commandline. The conversion is successful and encoded mp4 audio is also good, but the image don't seem to appear. Do I have to specify a screen resolution ? Am I making any mistake ? How can I make the command more faster (I can't use -c:a copy as I may be converting other audio formats) ?

  



  ffmpeg -y -loop 1 -framerate 15 -i  "/storage/emulated/0/Download/Kites.jpg" -i "/storage/emulated/0/Download/myaudio.mp3" -c:v libx264 -c:a libmp3lame -shortest "/storage/emulated/0/Download/Out.mp4"