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• 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


  


• 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 ?

  


• How to scan a folder recursively in ffmpeg to check for presence of subtitles ?

  22 décembre 2022, par frosty

  I have a folder (with subfolders) of videos on my Raspberry Pi, some containing soft-embedded subtitles and some without.

  


  I want to use ffmpeg to check for the presence of the soft-embedded subtitle, and return a result against each filename so that I can locate.

  


  The videos may be mp4, mkv or avi.

  


  I have been using this command successfully but in a limited way as it only works for .mp4 files and doesn't check recursively. The output is a nice list with either a 0 or 1 at the beginning of the line, where 1 means that there is no subtitle.

  


  for f in *.mp4; do ffmpeg -i "$f" -c copy -map 0:s:0 -frames:s 1 -f null - -v 0 -hide_banner; echo $? "$f" ; done


  


  I have tried all manner of ways like find and -exec, read, xargs, all to no avail. The below is the closest I've got, but it doesn't deal with whitespaces properly so filenames including spaces are split over two lines and the command seems to run only one word at a time, so it fails and shows 1 for everything.

  


  for f in `find /mnt/SSD/ | grep -E '(.mp4|.mkv|.avi)'`; do ffmpeg -i "$f" -c copy -map 0:s:0 -frames:s 1 -f null - -v 0 -hide_banner; echo $? "$f" ; done


  


  Any ideas what I'm doing wrong ?