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• FFMPEG - Stream discovered after head already parsed [on hold]

  7 février 2014, par John Doe

  I am trying to live transcode an RTMP stream to another RTMP HLS stream using the following command :

  ffmpeg -re -i rtmp://localhost/videochat/testing -c:v libx264 -c:a:0 libfaac -b:a:0 480k -f flv rtmp://localhost:12345/hls/mystream;

  However I receive the following error and the transcoding never begins :

  ffmpeg version git-2014-02-06-474db7a Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Feb  6 2014 22:20:14 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
  configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --               enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3
  
  libavutil      52. 63.100 / 52. 63.100
  
  libavcodec     55. 49.101 / 55. 49.101
  
  libavformat    55. 30.100 / 55. 30.100
  
  libavdevice    55.  7.100 / 55.  7.100
  
  libavfilter     4.  1.102 /  4.  1.102
  
  libswscale      2.  5.101 /  2.  5.101
  
  libswresample   0. 17.104 /  0. 17.104
  
  libpostproc    52.  3.100 / 52.  3.100
  
  Metadata:
  
  description           Chat using VideoChat example.
  
  [flv @ 0x1ec89e0] Stream discovered after head already parsed
  
  ^C[flv @ 0x1ec89e0] Could not find codec parameters for stream 0 (Video: none):    unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, flv, from 'rtmp://localhost/videochat/testing':
  
  Metadata:
  
  description     : Chat using VideoChat ex   ?5P
  
  Duration: N/A, start: 0.000000, bitrate: N/A
  
  Stream #0:0: Video: none, 1k tbr, 1k tbn, 1k tbc
  
  Stream #0:1: Data: none
  
  Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (rtmp://localhost:12345/hls/mystream) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
  
  Output #0, flv, to 'rtmp://localhost:12345/hls/mystream':

  If anyone has ever dealt/solved this problem before, can you please share as I have been trying to solve this for 2 days but to no avail !

• FFMPEG convert GIF to MP4 is cutting GIF short

  31 août 2019, par Jay

  I have this command line to run ffmpeg from aws lambda.

  The code is suppose to convert a GIF to a black background mp4.

  On my local PC it works perfectly.

  For whatever reason the ouput out of AWS Lambda is missing some of the GIF frames.

  Any Ideas ?????

  I have checked to make sure /tmp/2.gif is an accurate input and it is.

  os.system("/tmp/ffmpeg -f lavfi -i color=black -i /tmp/2.gif -movflags faststart -pix_fmt yuv420p  -filter_complex  '[0][1]scale2ref[bg][gif];[bg]scale=2*trunc(iw/2):2*trunc(ih/2),setsar=1[bg];[bg][gif]overlay=1' -c:v libx264 -preset veryslow  /tmp/black.mp4")

• ffmpeg - trying to output timecodes in CSV of segments between blacks

  20 juin 2022, par Soapa Tune

  I would be so glad to have some help with this.

  


  I have video rushes in this form : black > sequence > black > sequence...

  


  I need the start/end timecodes of each sequences (no black) to create segments on another software so I wondering if it's possible with the blackdetect filter of FFmpeg to output only the sequences data in a csv file. No problem with the simple command line to have the blacks but I'm still at this point with unsuccess others test.

  


  The goal is automate this for multiple files by import the csv in a RPA.

  


  Thank you very much.