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• convert ffprobe -show_streams audio stream bitrate to kbps

  10 juillet 2014, par SethjBack

  For the purpose of converting a video, I am getting some basic information about the audio stream of the video file using ffprobe :
  

  ffprobe -v quiet -show_streams -select_streams a -of json ../intro.m4v

  This gives me a nice json output :

  "streams": [
       {
           "index": 1,
           "codec_name": "mp3",
           "codec_long_name": "MP3 (MPEG audio layer 3)",
           "codec_type": "audio",
           "codec_time_base": "1/44100",
           "codec_tag_string": "mp4a",
           "codec_tag": "0x6134706d",
           "sample_fmt": "s16p",
           "sample_rate": "44100",
           "channels": 2,
           "channel_layout": "stereo",
           "bits_per_sample": 0,
           "r_frame_rate": "0/0",
           "avg_frame_rate": "0/0",
           "time_base": "1/44100",
           "start_pts": 0,
           "start_time": "0.000000",
           "duration_ts": 8637696,
           "duration": "195.866122",
           "bit_rate": "302869",
           "nb_frames": "7498",
           "disposition": {
               "default": 1,
               "dub": 0,
               "original": 0,
               "comment": 0,
               "lyrics": 0,
               "karaoke": 0,
               "forced": 0,
               "hearing_impaired": 0,
               "visual_impaired": 0,
               "clean_effects": 0,
               "attached_pic": 0
           }

  When converting the video, I only want to convert the audio stream if the bitrate is higher than my target (e.g. 96kbps).

  Given the output above, how do I make the audio bitrate comparison ? Can I convert the bit_rate number above into kbps ? Do I need more information to do the conversion ?

  Thank you for the help,

• How to detect anamorphic video with FFProbe ?

  29 mai 2015, par FlavorScape

  This is the output I get using FFProbe for a video I’m certain is anamorphic. I’ve converted it as a test with ffmpeg and the results are consistent with the video having a different PAR and DAR (video is squished). I ran some command line params to fix anamorphic video and it worked. Possibly my diagnosis is incorrect, the PAR and DAR are just plain wrong ?

  The code I used to "correct" the anamamorphic is

  --custom-anamorphic --display-width 1280 --keep-display-aspect --modulus 8 --crop 0:0:0:0

  Is there an additional command with FFProbe to detect for anamorphic ? So far I’m just seeing if the sample_aspect_ratio and display_aspect_ratio are the same or not.

  Additionally, a ratio of 0:1 seems incorrect. My video is not infinitely wide. Is there a bug with FFProbe output ?

  This is the command

  -print_format json -show_format -show_streams {originalFilePath}

  FFProbe version N-54233-g86190af built on Jun 27 2013 outputs the following :

  "Output{
  
      \"streams\": [
  
          {
  
              \"index\": 0,
  
              \"codec_name\": \"h264\",
  
              \"codec_long_name\": \"H.264/AVC/MPEG-4AVC/MPEG-4part10\",
  
              \"profile\": \"Main\",
  
              \"codec_type\": \"video\",
  
              \"codec_time_base\": \"1/5994\",
  
              \"codec_tag_string\": \"avc1\",
  
              \"codec_tag\": \"0x31637661\",
  
              \"width\": 1280,
  
              \"height\": 720,
  
              \"has_b_frames\": 0,
  
              \"sample_aspect_ratio\": \"0: 1\",
  
              \"display_aspect_ratio\": \"0: 1\",
  
              \"pix_fmt\": \"yuv420p\",
  
              \"level\": 31,
  
              \"r_frame_rate\": \"2997/100\",
  
              \"avg_frame_rate\": \"2997/100\",
  
              \"time_base\": \"1/2997\",
  
              \"start_pts\": 0,
  
              \"start_time\": \"0.000000\",
  
              \"duration_ts\": 204100,
  
              \"duration\": \"68.101435\",
  
              \"bit_rate\": \"3894381\",
  
              \"nb_frames\": \"2041\",
  
              \"disposition\": {
  
                  \"default\": 0,
  
                  \"dub\": 0,
  
                  \"original\": 0,
  
                  \"comment\": 0,
  
                  \"lyrics\": 0,
  
                  \"karaoke\": 0,
  
                  \"forced\": 0,
  
                  \"hearing_impaired\": 0,
  
                  \"visual_impaired\": 0,
  
                  \"clean_effects\": 0,
  
                  \"attached_pic\": 0
  
              },
  
              \"tags\": {
  
                  \"creation_time\": \"2013-05-0318: 33: 37\",
  
                  \"language\": \"eng\",
  
                  \"handler_name\": \"AppleAliasDataHandler\"
  
              }
  
          },
  
          {
  
              \"index\": 1,
  
              \"codec_name\": \"aac\",
  
              \"codec_long_name\": \"AAC(AdvancedAudioCoding)\",
  
              \"codec_type\": \"audio\",
  
              \"codec_time_base\": \"1/44100\",
  
              \"codec_tag_string\": \"mp4a\",
  
              \"codec_tag\": \"0x6134706d\",
  
              \"sample_fmt\": \"fltp\",
  
              \"sample_rate\": \"44100\",
  
              \"channels\": 2,
  
              \"bits_per_sample\": 0,
  
              \"r_frame_rate\": \"0/0\",
  
              \"avg_frame_rate\": \"0/0\",
  
              \"time_base\": \"1/44100\",
  
              \"start_pts\": 0,
  
              \"start_time\": \"0.000000\",
  
              \"duration_ts\": 3003392,
  
              \"duration\": \"68.104127\",
  
              \"bit_rate\": \"125304\",
  
              \"nb_frames\": \"2933\",
  
              \"disposition\": {
  
                  \"default\": 0,
  
                  \"dub\": 0,
  
                  \"original\": 0,
  
                  \"comment\": 0,
  
                  \"lyrics\": 0,
  
                  \"karaoke\": 0,
  
                  \"forced\": 0,
  
                  \"hearing_impaired\": 0,
  
                  \"visual_impaired\": 0,
  
                  \"clean_effects\": 0,
  
                  \"attached_pic\": 0
  
              },
  
              \"tags\": {
  
                  \"creation_time\": \"2013-05-0318: 33: 37\",
  
                  \"language\": \"eng\",
  
                  \"handler_name\": \"AppleAliasDataHandler\"
  
              }
  
          }
  
      ],
  
      \"format\": {
  
          \"filename\": \"\\\\\\\\dell690\\\\vsf\\\\_asset_intake\\\\v2\\\\ed69c939-4fe1-40dd-a045-db72ed2e0009\\\\original\\\\USTC_Overview2.mov\",
  
          \"nb_streams\": 2,
  
          \"format_name\": \"mov,
  
          mp4,
  
          m4a,
  
          3gp,
  
          3g2,
  
          mj2\",
  
          \"format_long_name\": \"QuickTime/MOV\",
  
          \"start_time\": \"0.000000\",
  
          \"duration\": \"68.100000\",
  
          \"size\": \"34267583\",
  
          \"bit_rate\": \"4025560\",
  
          \"tags\": {
  
              \"major_brand\": \"qt\",
  
              \"minor_version\": \"537199360\",
  
              \"compatible_brands\": \"qt\",
  
              \"creation_time\": \"2013-05-0318: 33: 37\"
  
          }
  
      }
  
  }"

• Merge Audio and Video with ffmpeg but keep the metadata

  1er août 2018, par fred beauchamp

  I’m doing a karaoke app on mobile and using the default player to cast the sound over Bluetooth. I would like to have information like the tempo and key in my receiver. I though about adding metadata to the mp3 embedded in the mp4 but when I append the mp3 to the mp4 container the metadata disappear.

  • I have a dummy mp4 with no sound streams (only video)

  • I use ffmpeg with :

    ffmpeg -i noSound.mp4 -i .sound.mp3 -c:v copy -c:a copy output.mp4

  Console Output