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• ffmpeg - Hyperthreading causes "Conversion failed" with multiple parallel instances

  6 février 2019, par MeanStreet

  I’m trying to extract images from multiple videos in parallel, using ffmpeg.
  Here’s my bash script :

  for video in *.MOV; do
  
      base=`basename "$video" .MOV`
  
      ffmpeg -i "$video" -r 0.02 "$base"/out_%02d.png > logs/"$base" 2>&1 &
  
  done

  When running this (on 60 videos), I check the logs/ files and 40 of them have crashed at the beginning with 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 !

  However it works fine with a smaller amount of videos (around 5, even on videos that didn’t work before).

  EDIT : I tried to disable hyperthreading and it works fine now. Why is hyperthreading causing ffmpeg to fail ?

• ARSS returns error "This WAVE file format is not currently supported"

  22 juin 2019, par itisyeetimetoday

  I have tried to import a wav file into ARSS : http://arss.sourceforge.net/index.shtml

  I get the above error.

  Files :
  https://drive.google.com/open?id=1X24eUOzOGa5uBUHFTtrSmzptIQTz-93l

  I have tried the following commands with FFmpeg to create a "clean" wav, however, they have all failed.

  ffmpeg -i "file.wav" -f wav -bitexact -acodec pcm_s16le -ar 22050 -ac 1 "ffmpeg.wav"
  
  
  
  ffmpeg -i file.wav -c copy -fflags +bitexact new.wav

  Ffmpeg appears to convert successfully, but it still returns the same error message in ARSS.

• ffmpeg returns "method SETUP failed : 404 Not Found"

  1er juillet 2019, par Alex

  We’re using ffmpeg (build ffmpeg-20190628-098ab93-win32-static) to take a snapshot from camera RTSP streams on a Win 10 system. On some cameras, we’re getting this error :

  [rtsp @ 06813ac0] method SETUP failed: 404 Not Found
  
  rtsp://username:password@example.com: Server returned 404 Not Found

  Here’s an example command we use :

  ffmpeg -y -i rtsp://username:password@example.com -vframes 1 -pix_fmt yuvj420p 
  
    -vf select='eq(pict_type\,I)' -q:v 1 _test.jpg

  However, VLC can load the same stream (we can’t use VLC, though) from the same machine. Additionally, we’ve opened the firewall to ffmpeg (it popped up the two firewall dialogs and we allowed it through).

  We’ve found posts on the DESCRIBE error but nothing on SETUP. Any help is appreciated. Thank you.

  Update : In VLC, that RTSP stream asks for credentials twice for some reason. Wondering if that’s the cause.