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• How to execute this ffmpeg command for multiple videos in a folder and rename them on Linux terminal [duplicate]

  3 février 2023, par average_grad_student

  I'm trying to change the framerate of my video to 15fps and I need to do that for 100+ videos that are in the same folder

  


  For processing a single video I use the following command-
ffmpeg -i input.mp4 -filter:v fps=fps=15 processed/input_15fpst.mp4

  


  How do I do this for multiple videos in the folder and add a suffix _15fps to them ? I'm not very familiar with Linux programming

  


  Thank you so much !

  


  I tried doing this-
  
for f in *.MP4; do ffmpeg -i "$f" -filter:v fps=fps=15 process/"$f"; done

  


  But I want to rename the file as well, how do I change my loop ?

  


• C++ Boost launching FFMPEG doesnt work, working ok via terminal

  21 juin 2023, par Pit Digger

  I am launching an FFMPEG process from C++ , the command is workign fine from terminal command line, but gives error when laucnhed from code. What could cause this ?

  


  Error

  


  [AVFilterGraph @ 0x3cfadc0] Error parsing filterchain "[0:v]split=3[v1][v2][v3];[v1]copy[v1out];[v2]scale=w=1280:h=720[v2out];[v3]scale=w=640:h=360[v3out]"
    
[AVFilterGraph @ 0x2f9fb00] Error parsing filterchain 
    
[AVFilterGraph @ 0x3cfadc0] Trailing garbage after a filter: split=3[v1][v2][v3];[v1]copy[v1out];[v2]scale=w=1280:h=720[v2out];[v3]scale=w=640:h=360[v3out]


  


  Code

  


  std::vector args;
args.push_back("-i"); args.push_back("input.mp4");
args.push_back("-filter_complex");
args.push_back("\"[0:v]split=3[v1][v2][v3];[v1]copy[v1out];[v2]scale=w=1280:h=720[v2out];[v3]scale=w=640:h=360[v3out]\"");

args.push_back("-map");  args.push_back("[v1out]");
args.push_back("-c:v:0");  args.push_back("libx264");
args.push_back("-x264-params");  args.push_back("\"nal-hrd=cbr:force-cfr=1\"");
args.push_back("-b:v:0");  args.push_back("1M");
args.push_back("-maxrate:v:0");  args.push_back("2M");
args.push_back("-minrate:v:0");  args.push_back("2M");
args.push_back("-bufsize:v:0");  args.push_back("2M");
args.push_back("-preset");  args.push_back("fast");
args.push_back("-g");  args.push_back("48");
args.push_back("-sc_threshold");  args.push_back("0");
args.push_back("-keyint_min");  args.push_back("48");

args.push_back("-map");  args.push_back("[v2out]");
args.push_back("-c:v:1");  args.push_back("libx264");
args.push_back("-x264-params");  args.push_back("\"nal-hrd=cbr:force-cfr=1\"");
args.push_back("-b:v:1");  args.push_back("1M");
args.push_back("-maxrate:v:1");  args.push_back("1M");
args.push_back("-minrate:v:1");  args.push_back("1M");
args.push_back("-bufsize:v:1");  args.push_back("1M");
args.push_back("-preset");  args.push_back("fast");
args.push_back("-g");  args.push_back("48");
args.push_back("-sc_threshold");  args.push_back("0");
args.push_back("-keyint_min");  args.push_back("48");

args.push_back("-map");  args.push_back("[v3out]");
args.push_back("-c:v:2");  args.push_back("libx264");
args.push_back("-x264-params");  args.push_back("\"nal-hrd=cbr:force-cfr=1\"");
args.push_back("-b:v:2");  args.push_back("500K");
args.push_back("-maxrate:v:2");  args.push_back("500K");
args.push_back("-minrate:v:2");  args.push_back("500K");
args.push_back("-bufsize:v:2");  args.push_back("500K");
args.push_back("-preset");  args.push_back("fast");
args.push_back("-g");  args.push_back("48");
args.push_back("-sc_threshold");  args.push_back("0");
args.push_back("-keyint_min");  args.push_back("48");

args.push_back("-map");  args.push_back("a:0");
args.push_back("-c:a:0");  args.push_back("aac");
args.push_back("-b:a:0");  args.push_back("96k");
args.push_back("-ac");  args.push_back("2");
args.push_back("-map");  args.push_back("a:0");
args.push_back("-c:a:1");  args.push_back("aac");
args.push_back("-b:a:1");  args.push_back("96k");
args.push_back("-ac");  args.push_back("2");
args.push_back("-map");  args.push_back("a:0");
args.push_back("-c:a:2");  args.push_back("aac");
args.push_back("-b:a:2");  args.push_back("48k");
args.push_back("-ac");  args.push_back("2");

args.push_back("-avoid_negative_ts");  args.push_back("1");
args.push_back("-f");  args.push_back("hls");
args.push_back("-hls_time");  args.push_back("6");
args.push_back("-hls_list_size");  args.push_back("15");
args.push_back("-hls_flags");  args.push_back("independent_segments");
args.push_back("-hls_segment_type");  args.push_back("mpegts");
args.push_back("-hls_segment_filename");  args.push_back("/output/stream_%v_data%02d.ts");
args.push_back("-master_pl_name");  args.push_back("index.m3u8");
args.push_back("-var_stream_map");  args.push_back("\"v:0,a:0 v:1,a:1 v:2,a:2\"");
args.push_back("/output/stream_%v.m3u8");


m_childProcess = std::make_unique(
            bp::exe = ffmpegPath,
            bp::args = args);


  


  Command that above code builds (indented for visibility) :

  


   ffmpeg -i input.mp4 -c copy -filter_complex "[0:v]split=3[v1][v2][v3];[v1]copy[v1out];[v2]scale=w=1280:h=720[v2out];[v3]scale=w=640:h=360[v3out]" 
-map [v1out] -c:v:0 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:0 1M -maxrate:v:0 2M -minrate:v:0 2M -bufsize:v:0 2M -preset fast -g 48 -sc_threshold 0 -keyint_min 48 
-map [v2out] -c:v:1 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:1 1M -maxrate:v:1 1M -minrate:v:1 1M -bufsize:v:1 1M -preset fast -g 48 -sc_threshold 0 -keyint_min 48  
-map [v3out] -c:v:2 libx264 -x264-params "nal-hrd=cbr:force-cfr=1" -b:v:2 500K -maxrate:v:2 500K -minrate:v:2 500K -bufsize:v:2 500K -preset fast -g 48 -sc_threshold 0 -keyint_min 48 -map a:0 -c:a:0 aac -b:a:0 96k -ac 2 
-map a:0 -c:a:1 aac -b:a:1 96k -ac 2 -map a:0 -c:a:2 aac -b:a:2 48k -ac 2 
-avoid_negative_ts 1 -f hls -hls_time 6 -hls_list_size 15 -hls_flags independent_segments -hls_segment_type mpegts -hls_segment_filename /output/stream_%v_data%02d.ts -master_pl_name index.m3u8 -var_stream_map "v:0,a:0 v:1,a:1 v:2,a:2" /output/stream_%v.m3u8


  


• Mac terminal command to list files and sort by date to use in ffmpeg

  22 septembre 2020, par Jeff

  I am using a gopro to film a bunch of videos. I want to then take those videos directly from the SD card folder and concatenate them into a single video (bypass an editor) by using FFMPEG.

  


  I'm currently able to stitch together "chaptered" videos with the following example command on my Mac (10.13) :

  


  ffmpeg -f concat -safe 0 -i <(for f in /sdcardfolder/100GOPRO/GH*488.MP4; do echo "file '$f'"; done) -c copy /folder/video.mp4

  


  The reason for this is that the ffmpeg command requires a text file that looks like this :

  


  


  file '/folder/GH016992.MP4'

  
file '/folder/GH036990.MP4'

  
...

  


  


  The real command is this, which generates the list of files in the right format with file in front of each one and can be embedded into the ffmpeg command :

  


  for f in /Volumes/GoPro8/DCIM/100GOPRO/GH0*71*.MP4; do echo "file '$f'"; done

  


  I want to add 2 changes to this :

  


  


  1. List the files in date order (ascending) : I want the list of files to be in date order. But I can't figure out how to add a -sort or something to the for f in command.

     


  


  2. Allow a more robust set of file matching/filtering : Right now I can add basic regex like GH*488.MP4 or, with chapters which increments the first number, something like GH0[123]488.MP4 would work to just get the first few. But when I change it to be more flexible like GH0[0-9]71[0-9][0-9].MP4 - which would be necessary to match all files that were recorded yesterday, but nothing before then, the command doesn't like this regex. It seems to only accept a *.

     


  


  


  I looked at a few examples like https://opensource.com/article/19/6/how-write-loop-bash but there wasn't much more than just listing files.

  


  This boils down to a terminal command and isn't really related to FFMPEG but I hope it's helpful context.

  


  I imagined it would be something like this, but this definitely doesn't work :

  


  for f in (find /Volumes/GoPro8/DCIM/100GOPRO/GH0[0-9]71[0-9][0-9].MP4 -type f | sort); do echo "file '$f'"; done

  


  I'd appreciate any help ! Thanks !

  


  Update

  


  It looks like sorting isn't easy with Mac tools so I gave up and wrote a much simpler Ruby script that could execute everything for me. This is not really an answer to my question above but it is a solution.

  


  Here I can easily write the text file necessary for ffmpeg and I can also filter files with a regex on the name, filter for a particular date, and size. Then, via the script, simply execute the ffmpeg command with args to concat files. I can also have it immediately resample the file to compress it (gopro videos are giant and I'm ok with a much lower bitrate if I want to save raw footage).

  


  I got lucky with this Dir.entries in Ruby - it seems to automatically sort by date ? I don't know how to sort it otherwise.

  


  PATH = '/Volumes/GoPro8/DCIM/100GOPRO/'
NEW_FILENAME = '/folder/new-file.mp4'
video_list = '/folder/ffmpeg-list.txt'

# create the text file
File.delete(video_list) if File.exist?(video_list)
i = 1
Dir.entries(PATH).each do |f|
    d = File.mtime(PATH + f)
    size = File.size(PATH + f)
    if f.match(/GH0.*.MP4/) && d.to_s.match(/2020-07-30/) && size.to_i < 1000000000
        puts "#{i}\t#{f}\t#{d}\t#{size}"
        File.write(video_list, "file #{PATH + f}\n", mode: "a")
        i= i+1
    end
end

command = "ffmpeg -f concat -safe 0 -i #{video_list} -c copy #{NEW_FILENAME}"

puts "executing concatenate..."
puts command
system(command)