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<std::string> 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::child>(
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
You include shell quoting but you're not using a shell, fix those:
std::vector<std::string> 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");
I would also consider rephrasing like
std::vector<std::string> args{
"-i", "input.mp4", //
"-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"
};