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• Adding two audio clips and an image to a video file using ffmpeg

  4 avril 2016, par Hadi F.

  I’m trying to add two audio clips and a png image to my video clip in ffmpeg. I also want to increase the volume of the two audio files in the same code. Here is the code I wrote :

      ffmpeg -i videoclip.mp4 -i logo.png -i audio1.mp3 -i audio2.m4a -filter_complex "[0:v][1:v]overlay=${x}:${y}:enable='between(t,${logoStartTime},${logoEndTime})'; [2:0]volume=${vol}[s3];[s3]adelay=${audioDelay}[s1];[3:0]volume=${vol2}[s4];[s4]adelay=${audioDelay2}[s2];[0:a][s1][s2] amix=inputs=3:duration=longest " -c:v libx264 -shortest out.mp4

  Everything works fine in the output video, except when I play the output video, the audio1.mp3 plays once right at the start and once at the time I specify in ’adelay’. I really don’t have any idea how to fix this and it’s driving me crazy ! Can anyone help please ?

• Use ffmpeg to edit metadata titles for multiple files

  19 mars 2017, par Nicholas Wireman

  I’d like to be able to add/edit video metadata titles to multiple files at once or with a single command, but I don’t know how to tell ffmpeg to do this.

  I read a similar post on the Ubuntu Forums, but I have never used string manipulation in Linux before, so the commands I’m seeing in the post are way out of my comprehension at the moment, and much of the discussion goes over my head.

  I’ve got all of my video files in a filename format that includes the show name, the episode number, and episode title. For example :

  show_name - episode_number - episode_title.extension

  Bleach - 001 - A Shinigami Is Born !.avi

  Is there a simple way to read the title and episode number from the filename and put it into a metadata tag without having to go through each and every file manually ?

  EDIT 1 : So I found out that I can iterate through files in a directory, and echo the filename, and I was told by a friend to try bash to parse the strings and return values from that to use in the ffmpeg command line. The problem is, I have absolutely no idea how to do this. The string manipulation in bash is very confusing on first look, and I can’t seem to get it to output what I want into my variables. My test bash :

   for file in "Bleach - 206 - The Past Chapter Begins! The Truth from 110 Years Ago.mkv"; do   extension=${file##*.} showName=${file%% *} episode=${file:9:3}; echo Extension: $extension Show: $showName Episode: $episode;    done

  That outputs

  Extension : mkv Show : Bleach Episode : 206

  Which are all the variables I’m going to need, I just don’t know how to move those to be run in ffmpeg now.

  EDIT 2 : I believe I was able, through much trial and error, to find a bash command that would do exactly what I wanted.

  for file in *; do   newname=${file:0:-4}_2 ext=${file##*.} filename=${file} showname=${file%% *} episode=${file:9:3} nameext=${file##*- } title=${nameext%.*};     ffmpeg -i "$filename" -metadata title="$title" -metadata track=$episode -metadata album=$showname -c copy "$newname.$ext";    mv -f "$newname.$ext" "$filename";    done

  This lets me parse the information from the filename, copy it to some variables, and then run ffmpeg using those variables. It outputs to a second file, then moves that file to the original location, overwriting the original. One could remove that section out if you’re not sure about how it’s going to parse your files, but I’m glad I was able to get a solution that works for me.

• How to use FFTools to determine actual FPS of an RTMP stream

  17 mai 2016, par Dexter1759

  I’m trying to determine the best way to analyse any RTMP stream. I’m currently settled upon the FFMPEG suite of tools, however, I find myself in need of help before I drive myself crazy.

  I’m trying to validate a stream, I’ve been asked to determine the following :

  • Can I connect to the stream ? - this can be done easily with FFProbe
  • Is there video ? (i.e. it’s not all black) - I’ve managed to build a POC so don’t think this will be a problem.
  • Is there audio ? (i.e. not all silent) - Again, don’t think this is a problem based on my POC.
  • Actual FPS - here’s where I get stuck because the meta data shows 25fps and that’s what FFTools return.

  However, using FFPlay I can see the odd message of "no frame !" and would prefer to calculate the actual FPS for comparison.

  Any help/advice with this toolset would be useful.

  (Note : I’ve also had other issues/questions with this toolset but have started with this one rather than dump a list here)

  Many thanks.

  EDIT - Forgot to mention the stream is of a live feed so things like "duration" and "nb_frames" return "N/A"