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• ffmpeg error during encoding : EOF timestamp not reliable

  5 décembre 2019, par Massimo Vantaggio

  I have noticed that some videos processed by the following command displays an error in the preliminary phase of the process :

  [Parsed_movie_0 @ 0x7fb06cf00d80] EOF timestamp not reliable

  All this happens while I’m testing the ffmpeg command line that generates the encoding with the specific required by dash :

  ffmpeg -y -i inputfile.mp4 -c:a aac -b:a 384k -ar 48000 -ac 2 -async 1 -c:v libx264 -x264opts keyint=60:min-keyint=60:no-scenecut -r 30 -b:v 2400k -maxrate 2400k -bufsize 1200k -t 3600 -vf "scale=-1:$size" -vf "movie=logo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]" format.mp4

  It work fine with some videos with small duration but by testing with some movies downloaded it give this error and i believe that could be a problem for MP4Box when dashing which other errors.
  Does anyone have any notices about it ? Is the command line suitable for dash ?
  Thanks
  Massimo

• Screen capture with libavcodec/ffmpeg, and write it to mp4 file

  10 février 2015, par Drakkainen

  I’m trying to (programatically) record the screen with DirectShow screen driver. I wrote some quick and (very) dirty code to try to get that to work (http://pastebin.com/ZJuhZRCz) based on ffmpeg examples but I have lots of trouble figuring out what time_base/framerate to use. If i leave the time_base/framerate parts empty I only get a single still frame. If i change them to any values, the video just turns black.

  I’m guessing it has something to do with the output file settings, but I just ran out of ideas on what to try. Any pointers/help would be greatly appreciated.

• ffmpeg generate overlay complex filter for audio with background image

  8 janvier 2016, par user1793606

  I am experimenting with ffmpeg and would like to generate overlay complex filter for audio with background image. The code normally works, except for when adding -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a
  it crashes. I found the example code at https://trac.ffmpeg.org/wiki/Waveform Any help is appreciated.

  Command '['c:/ffmpeg/bin\\ffmpeg.exe', '-y', '-loop', '1', '-r', '1', '-i', 'temp\\bg.png', '-i', 'test.mp3', '-filter_complex', '[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]', '-map', '[v]', '-map', '0:a', '-c:v', 'libx264', '-preset', 'ultrafast', '-tune', 'stillimage', '-crf', '15', '-pix_fmt', 'yuv420p', '-strict', 'experimental', '-c:a', 'aac', '-b:a', '256k', '-shortest', '-threads', '0', 'done/test.mp4']'

  EDIT 1 :

  I tested this with the new verson : ffmpeg -y -i input.mp3 -i background.png -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a -c:v libx264 -c:a copy output.mp4

  It generates an output file, but only the waveform, no background included. My end goal is to generate the waveform over the background.