C++ Boost启动FFMPEG不工作，通过终端正常工作

bxfogqkk  于 2023-06-25  发布在  其他
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我从C++启动一个FFMPEG进程，该命令从终端命令行工作正常，但从代码启动时出错。什么会导致这种情况？

错误

  1. [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]"
  2.     
  3. [AVFilterGraph @ 0x2f9fb00] Error parsing filterchain 
  4.     
  5. [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]

编码

  1. std::vector<std::string> args;
  2. args.push_back("-i"); args.push_back("input.mp4");
  3. args.push_back("-filter_complex");
  4. 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]\"");
  6. args.push_back("-map");  args.push_back("[v1out]");
  7. args.push_back("-c:v:0");  args.push_back("libx264");
  8. args.push_back("-x264-params");  args.push_back("\"nal-hrd=cbr:force-cfr=1\"");
  9. args.push_back("-b:v:0");  args.push_back("1M");
  10. args.push_back("-maxrate:v:0");  args.push_back("2M");
  11. args.push_back("-minrate:v:0");  args.push_back("2M");
  12. args.push_back("-bufsize:v:0");  args.push_back("2M");
  13. args.push_back("-preset");  args.push_back("fast");
  14. args.push_back("-g");  args.push_back("48");
  15. args.push_back("-sc_threshold");  args.push_back("0");
  16. args.push_back("-keyint_min");  args.push_back("48");
  18. args.push_back("-map");  args.push_back("[v2out]");
  19. args.push_back("-c:v:1");  args.push_back("libx264");
  20. args.push_back("-x264-params");  args.push_back("\"nal-hrd=cbr:force-cfr=1\"");
  21. args.push_back("-b:v:1");  args.push_back("1M");
  22. args.push_back("-maxrate:v:1");  args.push_back("1M");
  23. args.push_back("-minrate:v:1");  args.push_back("1M");
  24. args.push_back("-bufsize:v:1");  args.push_back("1M");
  25. args.push_back("-preset");  args.push_back("fast");
  26. args.push_back("-g");  args.push_back("48");
  27. args.push_back("-sc_threshold");  args.push_back("0");
  28. args.push_back("-keyint_min");  args.push_back("48");
  30. args.push_back("-map");  args.push_back("[v3out]");
  31. args.push_back("-c:v:2");  args.push_back("libx264");
  32. args.push_back("-x264-params");  args.push_back("\"nal-hrd=cbr:force-cfr=1\"");
  33. args.push_back("-b:v:2");  args.push_back("500K");
  34. args.push_back("-maxrate:v:2");  args.push_back("500K");
  35. args.push_back("-minrate:v:2");  args.push_back("500K");
  36. args.push_back("-bufsize:v:2");  args.push_back("500K");
  37. args.push_back("-preset");  args.push_back("fast");
  38. args.push_back("-g");  args.push_back("48");
  39. args.push_back("-sc_threshold");  args.push_back("0");
  40. args.push_back("-keyint_min");  args.push_back("48");
  42. args.push_back("-map");  args.push_back("a:0");
  43. args.push_back("-c:a:0");  args.push_back("aac");
  44. args.push_back("-b:a:0");  args.push_back("96k");
  45. args.push_back("-ac");  args.push_back("2");
  46. args.push_back("-map");  args.push_back("a:0");
  47. args.push_back("-c:a:1");  args.push_back("aac");
  48. args.push_back("-b:a:1");  args.push_back("96k");
  49. args.push_back("-ac");  args.push_back("2");
  50. args.push_back("-map");  args.push_back("a:0");
  51. args.push_back("-c:a:2");  args.push_back("aac");
  52. args.push_back("-b:a:2");  args.push_back("48k");
  53. args.push_back("-ac");  args.push_back("2");
  55. args.push_back("-avoid_negative_ts");  args.push_back("1");
  56. args.push_back("-f");  args.push_back("hls");
  57. args.push_back("-hls_time");  args.push_back("6");
  58. args.push_back("-hls_list_size");  args.push_back("15");
  59. args.push_back("-hls_flags");  args.push_back("independent_segments");
  60. args.push_back("-hls_segment_type");  args.push_back("mpegts");
  61. args.push_back("-hls_segment_filename");  args.push_back("/output/stream_%v_data%02d.ts");
  62. args.push_back("-master_pl_name");  args.push_back("index.m3u8");
  63. args.push_back("-var_stream_map");  args.push_back("\"v:0,a:0 v:1,a:1 v:2,a:2\"");
  64. args.push_back("/output/stream_%v.m3u8");
  66. m_childProcess = std::make_unique<bp::child>(
  67.             bp::exe = ffmpegPath,
  68.             bp::args = args);

上面代码构建的命令（缩进可见）：

  1. 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]" 
  2. -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 
  3. -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  
  4. -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 
  5. -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 
  6. -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
c++

1条答案

按热度按时间
mfuanj7w

mfuanj7w1#

你包含了shell引号，但你没有使用shell，修复这些：

  1. std::vector<std::string> args;
  2. args.push_back("-i"); args.push_back("input.mp4");
  3. args.push_back("-filter_complex");
  4. 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]");
  6. args.push_back("-map");                   args.push_back("[v1out]");
  7. args.push_back("-c:v:0");                 args.push_back("libx264");
  8. args.push_back("-x264-params");           args.push_back("nal-hrd=cbr:force-cfr=1");
  9. args.push_back("-b:v:0");                 args.push_back("1M");
  10. args.push_back("-maxrate:v:0");           args.push_back("2M");
  11. args.push_back("-minrate:v:0");           args.push_back("2M");
  12. args.push_back("-bufsize:v:0");           args.push_back("2M");
  13. args.push_back("-preset");                args.push_back("fast");
  14. args.push_back("-g");                     args.push_back("48");
  15. args.push_back("-sc_threshold");          args.push_back("0");
  16. args.push_back("-keyint_min");            args.push_back("48");
  18. args.push_back("-map");                   args.push_back("[v2out]");
  19. args.push_back("-c:v:1");                 args.push_back("libx264");
  20. args.push_back("-x264-params");           args.push_back("nal-hrd=cbr:force-cfr=1");
  21. args.push_back("-b:v:1");                 args.push_back("1M");
  22. args.push_back("-maxrate:v:1");           args.push_back("1M");
  23. args.push_back("-minrate:v:1");           args.push_back("1M");
  24. args.push_back("-bufsize:v:1");           args.push_back("1M");
  25. args.push_back("-preset");                args.push_back("fast");
  26. args.push_back("-g");                     args.push_back("48");
  27. args.push_back("-sc_threshold");          args.push_back("0");
  28. args.push_back("-keyint_min");            args.push_back("48");
  30. args.push_back("-map");                   args.push_back("[v3out]");
  31. args.push_back("-c:v:2");                 args.push_back("libx264");
  32. args.push_back("-x264-params");           args.push_back("nal-hrd=cbr:force-cfr=1");
  33. args.push_back("-b:v:2");                 args.push_back("500K");
  34. args.push_back("-maxrate:v:2");           args.push_back("500K");
  35. args.push_back("-minrate:v:2");           args.push_back("500K");
  36. args.push_back("-bufsize:v:2");           args.push_back("500K");
  37. args.push_back("-preset");                args.push_back("fast");
  38. args.push_back("-g");                     args.push_back("48");
  39. args.push_back("-sc_threshold");          args.push_back("0");
  40. args.push_back("-keyint_min");            args.push_back("48");
  42. args.push_back("-map");                   args.push_back("a:0");
  43. args.push_back("-c:a:0");                 args.push_back("aac");
  44. args.push_back("-b:a:0");                 args.push_back("96k");
  45. args.push_back("-ac");                    args.push_back("2");
  46. args.push_back("-map");                   args.push_back("a:0");
  47. args.push_back("-c:a:1");                 args.push_back("aac");
  48. args.push_back("-b:a:1");                 args.push_back("96k");
  49. args.push_back("-ac");                    args.push_back("2");
  50. args.push_back("-map");                   args.push_back("a:0");
  51. args.push_back("-c:a:2");                 args.push_back("aac");
  52. args.push_back("-b:a:2");                 args.push_back("48k");
  53. args.push_back("-ac");                    args.push_back("2");
  55. args.push_back("-avoid_negative_ts");     args.push_back("1");
  56. args.push_back("-f");                     args.push_back("hls");
  57. args.push_back("-hls_time");              args.push_back("6");
  58. args.push_back("-hls_list_size");         args.push_back("15");
  59. args.push_back("-hls_flags");             args.push_back("independent_segments");
  60. args.push_back("-hls_segment_type");      args.push_back("mpegts");
  61. args.push_back("-hls_segment_filename");  args.push_back("/output/stream_%v_data%02d.ts");
  62. args.push_back("-master_pl_name");        args.push_back("index.m3u8");
  63. args.push_back("-var_stream_map");        args.push_back("v:0,a:0 v:1,a:1 v:2,a:2");
  64. args.push_back("/output/stream_%v.m3u8");

我也会考虑换个说法

  1. std::vector<std::string> args{
  2.     "-i", "input.mp4",       //
  3.     "-filter_complex", //
  4.     "[0:v]split=3[v1][v2][v3];[v1]copy[v1out];[v2]scale=w=1280:h=720[v2out];[v3]scale=w=640:h=360[v3out]", //
  6.     "-map",          "[v1out]",
  7.     "-c:v:0",        "libx264",
  8.     "-x264-params",  "nal-hrd=cbr:force-cfr=1",
  9.     "-b:v:0",        "1M",
  10.     "-maxrate:v:0",  "2M",
  11.     "-minrate:v:0",  "2M",
  12.     "-bufsize:v:0",  "2M",
  13.     "-preset",       "fast",
  14.     "-g",            "48",
  15.     "-sc_threshold", "0",
  16.     "-keyint_min",   "48",
  18.     "-map",          "[v2out]",
  19.     "-c:v:1",        "libx264",
  20.     "-x264-params",  "nal-hrd=cbr:force-cfr=1",
  21.     "-b:v:1",        "1M",
  22.     "-maxrate:v:1",  "1M",
  23.     "-minrate:v:1",  "1M",
  24.     "-bufsize:v:1",  "1M",
  25.     "-preset",       "fast",
  26.     "-g",            "48",
  27.     "-sc_threshold", "0",
  28.     "-keyint_min",   "48",
  30.     "-map",          "[v3out]",
  31.     "-c:v:2",        "libx264",
  32.     "-x264-params",  "nal-hrd=cbr:force-cfr=1",
  33.     "-b:v:2",        "500K",
  34.     "-maxrate:v:2",  "500K",
  35.     "-minrate:v:2",  "500K",
  36.     "-bufsize:v:2",  "500K",
  37.     "-preset",       "fast",
  38.     "-g",            "48",
  39.     "-sc_threshold", "0",
  40.     "-keyint_min",   "48",
  42.     "-map",   "a:0",
  43.     "-c:a:0", "aac",
  44.     "-b:a:0", "96k",
  45.     "-ac",    "2",
  46.     "-map",   "a:0",
  47.     "-c:a:1", "aac",
  48.     "-b:a:1", "96k",
  49.     "-ac",    "2",
  50.     "-map",   "a:0",
  51.     "-c:a:2", "aac",
  52.     "-b:a:2", "48k",
  53.     "-ac",    "2",
  55.     "-avoid_negative_ts",    "1",
  56.     "-f",                    "hls",
  57.     "-hls_time",             "6",
  58.     "-hls_list_size",        "15",
  59.     "-hls_flags",            "independent_segments",
  60.     "-hls_segment_type",     "mpegts",
  61.     "-hls_segment_filename", "/output/stream_%v_data%02d.ts",
  62.     "-master_pl_name",       "index.m3u8",
  63.     "-var_stream_map",       "v:0,a:0 v:1,a:1 v:2,a:2",
  64.     "/output/stream_%v.m3u8"
  65. };
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