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• Capturing audio and video from different sources, how to sync ?

  16 février 2017, par aerodavo

  Here is my code :

  Lapaki:~ Lapaki$ /Users/Lapaki/Desktop/ffmpeg -f avfoundation -video_size 960x540 -pixel_format uyvy422 -framerate ntsc -thread_queue_size 8B -i "XI:none" -f avfoundation -thread_queue_size 8B -i "none:XI" -vf 'crop=iw-240:ih:120:0' -af 'asetpts=PTS+.58735/TB' -pix_fmt yuv420p -aspect 4:3 -s 720x480 -q:v 3 -maxrate 5000k -bufsize 2000k -acodec ac3 -ac 2 -ab 256k -ar 48000 -f dvd /Users/Lapaki/Desktop/FF\ Test/`date +%F`\ `date +%H_%M_%S`.mpg
  
  ffmpeg version 3.2.3-tessus Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzmq --enable-version3 --disable-ffplay --disable-indev=qtkit --disable-indev=x11grab_xcb
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, avfoundation, from 'XI:none':
  
    Duration: N/A, start: 648413.295900, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 960x540, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
  
  Input #1, avfoundation, from 'none:XI':
  
    Duration: N/A, start: 648413.884042, bitrate: 3072 kb/s
  
      Stream #1:0: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s
  
  Output #0, dvd, to '/Users/Lapaki/Desktop/FF Test/2017-02-16 04_16_33.mpg':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: mpeg2video (Main), yuv420p, 720x480 [SAR 8:9 DAR 4:3], q=2-31, 200 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 mpeg2video
  
      Side data:
  
        cpb: bitrate max/min/avg: 5000000/0/200000 buffer size: 2000000 vbv_delay: -1
  
      Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 256 kb/s
  
      Metadata:
  
        encoder         : Lavc57.64.101 ac3
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
  
    Stream #1:0 -> #0:1 (pcm_f32le (native) -> ac3 (native))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x7f8e0c8ab400] Warning: data is not aligned! This can lead to a speedloss
  
  frame=   33 fps=0.0 q=3.0 size=     266kB time=00:00:01.06 bitrate=2051.9kbits/sframe=   49 fps= 48 q=3.0 size=     444kB time=00:00:01.54 bitrate=2358.8kbits/sframe=   64 fps= 42 q=3.0 size=     652kB time=00:00:02.08 bitrate=2560.5kbits/sframe=   79 fps= 39 q=3.0 size=     838kB time=00:00:02.59 bitrate=2642.4kbits/sframe=   94 fps= 37 q=3.0 size=    1022kB time=00:00:03.07 bitrate=2720.0kbits/sframe=  109 fps= 36 q=3.0 size=    1208kB time=00:00:03.59 bitrate=2756.5kbits/sframe=  124 fps= 35 q=3.0 size=    1406kB time=00:00:04.07 bitrate=2830.0kbits/sframe=  127 fps= 35 q=3.0 Lsize=    1474kB time=00:00:04.19 bitrate=2876.4kbits/s dup=12 drop=0 speed=1.15x    
  
  video:1310kB audio:113kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.604597%

  The start of Input #0 is 648413.295900, and the start of Input #1 is 648413.884042.

  I’ve been able to keep the audio and video in very close sync by subtracting the two values (which I assume are wallclock values), and using the asetpts audio filter to delay the audio stream of the recorded mpeg-2 file by that amount.

  I’d like to be able to do this exactly though, and that value changes slightly every time I start a new capture. Not to mention, I’d like to be able to do this reliably on different machines, where I assume the value will most likely be different, thus using a calculation as opposed to a fixed number is obviously the best option, if it’s possible.

  Is there a way to subtract the wallclock start time of input #0 from the wallclock start time of input #1 ? I’d like to do this inside the asetpts filter, instead of manually finding the difference from a previous run, which again is slightly different every time...

  I was thinking something like -af asetpts=PTS-([1:0]RTCSTART-[0:0]RTCSTART)/TB might work, but I have no idea how to format it.

  Thanks in advance !

• FFMpeg Concat Error - What needs to be changed ?

  19 avril 2018, par Andrew Baldinger

  I have a tv episode video (let’s say episode.mp4). I also have a short, 20 second closing credit video that I want to append to various episodes (let’s say closing.mp4) The episode and closing are always Mp4, h264. The frame sizes are also the same. The audio codecs do vary, though. I would like to concat using concat demuxer to avoid having to re-encode. I tried doing this, but it gives me an error. I would like to make any necessary encoding changes to the short closing clip (so I would create multiple closing files, each matching the main episode file I want to add it to). What do I need to additionally make sure matches with the two videos to be able to use concat demuxer ? How would I edit the closing clip to match the episode ?

  Here is a probe of the ending clip :

      [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=1001/48000
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=1280
  
  height=720
  
  coded_width=1280
  
  coded_height=720
  
  has_b_frames=2
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=16:9
  
  pix_fmt=yuv420p
  
  level=31
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=24000/1001
  
  avg_frame_rate=24000/1001
  
  time_base=1/24000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=672672
  
  duration=28.028000
  
  bit_rate=442973
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=672
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:language=eng
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=aac
  
  codec_long_name=AAC (Advanced Audio Coding)
  
  profile=LC
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=mp4a
  
  codec_tag=0x6134706d
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/48000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=1344000
  
  duration=28.000000
  
  bit_rate=128651
  
  max_bit_rate=128651
  
  bits_per_raw_sample=N/A
  
  nb_frames=1314
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A

  Here is a probe of a sample episode :

  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=208879/10016000
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=1280
  
  height=718
  
  coded_width=1280
  
  coded_height=718
  
  has_b_frames=2
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=640:359
  
  pix_fmt=yuv420p
  
  level=31
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=24000/1001
  
  avg_frame_rate=5008000/208879
  
  time_base=1/16000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=40104768
  
  duration=2506.548000
  
  bit_rate=1092383
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=60096
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:language=und
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=ac3
  
  codec_long_name=ATSC A/52A (AC-3)
  
  profile=unknown
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=ac-3
  
  codec_tag=0x332d6361
  
  sample_fmt=fltp
  
  sample_rate=48000
  
  channels=2
  
  channel_layout=stereo
  
  bits_per_sample=0
  
  dmix_mode=-1
  
  ltrt_cmixlev=-1.000000
  
  ltrt_surmixlev=-1.000000
  
  loro_cmixlev=-1.000000
  
  loro_surmixlev=-1.000000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/48000
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=120313200
  
  duration=2506.525000
  
  bit_rate=192000
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=78329
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A

  Finally, I am running Windows 10 and here is a probe on my setup :

  ffprobe version N-87327-g18821e3 Copyright (c) 2007-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 75.100 / 55. 75.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.100 / 57. 82.100
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100

  I created a version of the ending with the same screen size and audio codec as the episode. But, when I try to concat, the resulting video is much longer (1:03:00) than it should be (about 42 mins), and it freezes when played. Here is the concat :

  ffmpeg -f concat -safe 0 -i "concat.txt" -c copy 's04e06.mp4'
  
  ffmpeg : ffmpeg version N-87327-g18821e3 Copyright (c) 2000-2017 the FFmpeg developers
  
  At line:1 char:1
  
  + ffmpeg -f concat -safe 0 -i "concat.txt"  ...
  
  + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
      + CategoryInfo          : NotSpecified: (ffmpeg version ...mpeg developers:String) [], RemoteException
  
      + FullyQualifiedErrorId : NativeCommandError
  
  
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 
  
  --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r 
  
  --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca 
  
  --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame 
  
  --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus 
  
  --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame 
  
  --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack 
  
  --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 
  
  --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 75.100 / 55. 75.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.100 / 57. 82.100
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000047cb020]
  
   Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'concat.txt':
  
    Duration: N/A, start: -0.002333, bitrate: 1284 kb/s
  
      Stream #0:
  
  0(und
  
  ): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x718 [SAR 1:1 DAR 640:359], 1092 kb/s
  
  , 
  
  23.98 fps, 
  
  23.98 tbr, 
  
  16k tbn, 47.95 tb
  
  c
  
      Metadata:
  
        handler_name    : 
  
  VideoHandler
  
      Stream #0:
  
  1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 192 kb/s
  
      Metadata:
  
        handler_name    : 
  
  SoundHandler
  
  [mp4 @ 0000000004daf380]
  
  
  
  track 1: codec frame size is not set
  
  Output #0, mp4, to 's04e06.mp4':
  
    Metadata:
  
      encoder         : 
  
  Lavf57.82.10
  
  0
  
      Stream #0:
  
  0
  
  (und)
  
  : Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x718 [SAR 1:1 DAR 640:359], q=2-31, 1092 kb/s
  
  , 
  
  23.98 fps, 23.98 tbr,
  
   16k tbn, 
  
  16k tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo, fltp, 192 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame= 3050 fps=0.0 q=-1.0 size=   32768kB time=00:02:07.16 bitrate=2110.9kbits/s speed= 254x    
  
  frame= 7005 fps=6993 q=-1.0 size=   65536kB time=00:04:52.12 bitrate=1837.8kbits/s speed= 292x    
  
  frame=12638 fps=8414 q=-1.0 size=   99072kB time=00:08:47.04 bitrate=1539.9kbits/s speed= 351x    
  
  frame=17009 fps=8492 q=-1.0 size=  125440kB time=00:11:49.34 bitrate=1448.7kbits/s speed= 354x    
  
  frame=18981 fps=7413 q=-1.0 size=  136704kB time=00:13:11.61 bitrate=1414.7kbits/s speed= 309x    
  
  frame=20233 fps=6444 q=-1.0 size=  144896kB time=00:14:03.80 bitrate=1406.7kbits/s speed= 269x    
  
  frame=23615 fps=6421 q=-1.0 size=  165888kB time=00:16:24.89 bitrate=1379.8kbits/s speed= 268x    
  
  frame=25322 fps=6057 q=-1.0 size=  175360kB time=00:17:36.06 bitrate=1360.3kbits/s speed= 253x    
  
  frame=26957 fps=5759 q=-1.0 size=  184576kB time=00:18:44.25 bitrate=1344.9kbits/s speed= 240x    
  
  frame=31478 fps=6076 q=-1.0 size=  215040kB time=00:21:52.83 bitrate=1341.8kbits/s speed= 253x    
  
  frame=33517 fps=5900 q=-1.0 size=  235264kB time=00:23:17.88 bitrate=1378.7kbits/s speed= 246x    
  
  frame=34974 fps=5658 q=-1.0 size=  246272kB time=00:24:18.65 bitrate=1383.1kbits/s speed= 236x    
  
  frame=36987 fps=5437 q=-1.0 size=  259840kB time=00:25:42.59 bitrate=1379.9kbits/s speed= 227x    
  
  frame=37543 fps=5140 q=-1.0 size=  263168kB time=00:26:05.79 bitrate=1376.9kbits/s speed= 214x    
  
  frame=39203 fps=4982 q=-1.0 size=  273152kB time=00:27:15.04 bitrate=1368.6kbits/s speed= 208x    
  
  frame=45904 fps=5484 q=-1.0 size=  305408kB time=00:31:54.52 bitrate=1306.8kbits/s speed= 229x    
  
  frame=47996 fps=5410 q=-1.0 size=  318720kB time=00:33:21.75 bitrate=1304.3kbits/s speed= 226x    
  
  frame=50719 fps=5409 q=-1.0 size=  336128kB time=00:35:15.32 bitrate=1301.7kbits/s speed= 226x    
  
  frame=53508 fps=5409 q=-1.0 size=  354560kB time=00:37:11.65 bitrate=1301.5kbits/s speed= 226x    
  
  frame=57118 fps=5452 q=-1.0 size=  372736kB time=00:39:42.24 bitrate=1281.8kbits/s speed= 227x    
  
  frame=58440 fps=5324 q=-1.0 size=  382208kB time=00:40:37.35 bitrate=1284.6kbits/s speed= 222x    
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000047d3640]
  
   Auto-inserting h264_mp4toannexb bitstream filter
  
  frame=60098 fps=5228 q=-1.0 size=  392960kB time=01:02:39.76 bitrate= 856.2kbits/s speed= 327x    
  
  frame=60746 fps=5031 q=-1.0 size=  393472kB time=01:03:20.30 bitrate= 848.2kbits/s speed= 315x    
  
  frame=60768 fps=4978 q=-1.0 Lsize=  397136kB time=01:03:21.67 bitrate= 855.8kbits/s speed= 311x    
  
  video:335753kB audio:59186kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.556209%

• You can generate a video with audio and videos clip with ffmpeg

  8 mai 2018, par Jhonny Luis

  I am making an application in which I have to generate a single video clip of x duration, I was recommended to use the ffmpeg but I do not know if it could be created and if possible how the structure would be, since I understand that you need a file with a structure in which the path is established in this case videos and audio, I am working on codeigniter with php 7, I have already executed the ffmpeg to change the format of a video.

  The question is the following, from a database I bring the list of the route of the videos its duration and weight, equal with the audios, the thing is how I can do to create the video with ffmpeg from this.