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• avcodec/exif : avoid allocation failure on empty EXIF metadata

  24 août, par Leo Izen

  avcodec/exif : avoid allocation failure on empty EXIF metadata
  An EXIF IFD with 0 entries is legal, but does not contain metadata. We
  
  should not attempt to allocate a struct with size zero in this case, as
  
  this causes an allocation failure. Instead, we just leave the struct
  
  empty.
  Fixes : #20305.
  Signed-off-by : Leo Izen <leo.izen@gmail.com>
  

  • [DH] libavcodec/exif.c

• Livestreaming screencast to Youtube through ffmpeg doesn't show video even though data is received [duplicate]

  15 novembre 2017, par CindyRabbit

  This question already has an answer here :

  • YouTube live says not receiving data
    
    1 answer
    
  • adding silent audio in ffmpeg
    
    4 answers
    

  I am trying to livestream my Desktop in Ubuntu to Youtube and used this cmd. Youtube livestream showed green bar with "Receiving your data" and Youtube log also showed "Stream healthy", however no video showed up in Youtube player, and after a short while Youtube log said "Stream complete". What’s missing in my cmd ?

  ffmpeg -f x11grab -r 10 -s 1024x720 -i :0.0 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -g 20 -b:v 2500k -threads 0 -bufsize 512k -f flv rtmp ://a.rtmp.youtube.com/live2/myKey

  BTW, only screencasting doesn’t work for me, streaming a video file works for me.

• is there a single command to process different audio layouts ? [closed]

  10 août 2023, par Omer Weiss

  I want to use a single ffmpeg command that will output a single stereo audio track.
My problem is that I want to use a single command for 2 possible layouts on the input :
1 : a single stereo track
2 : two mono tracks.

  


  to put in filtergraph terms, the output should have option #1's [0:a:0:0] or option #2's [0:a:0] as Left and option #1's [0:a:0:1] or option #2's [0:a:1] as Right.

  


  Explicit reference results in runtime error (Invalid stream specifier).

  


  this command does the right thing on the single stereo input (op#1) but results in silent Right on 2 mono tracks op#2) :

  


  ffmpeg -i $1 -filter_complex "[0:a]pan=stereo|c0=c0|c1=c1[out]" -map 0:v -map "[out]" -c:v copy -c:a aac -strict experimental -b:a 192k -ac 2 -ar 44100 -acodec aac -ab 192k "merged_$1.mp4"

  


  this command does the right thing on the single stereo input (op#1) but results in silent Right on 2 mono tracks op#2) :

  


  ffmpeg -i $1 -filter_complex "[0:a]pan=stereo|c0=c0|c1=c1[out]" -map 0:v -map "[out]" -c:v copy -c:a aac -strict experimental -b:a 192k -ac 2 -ar 44100 -acodec aac -ab 192k "merged_$1.mp4"

  


  I am looking for ways to suppress 'invalid stream specifier'.