Recherche avancée

Sur d’autres sites (18654)

• How to convert AAC/MP4A to MP3 using FFMPEG in full length ? Audio file gets cut off after 1 second

  6 novembre 2022, par Avatar

  I have recorded an audio file with MediaRecorder on iPhone.

  


  As ffmpeg command I am using :

  


  ffmpeg -i 18380889311644327118 -ar 44100 -ac 2 -b:a 128k -c:a libmp3lame -q:a 0 18380889311644327118.mp3


  


  -i specifies the input file
-vn disables all video-streams from the input
-ar audio sampling frequency
-ac number of audio channels
-b:a bit rate
-c:a libmp3lame - codec of target file
-q:a quality set audio quality (codec-specific) (lower is better), see https://superuser.com/a/1515841

-sn disables all subtitle-streams from the input
-dn disables all data-streams from the input


  


  The console output looks like this :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '18380889311644327118':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    creation_time   : 2021-12-08T15:44:06.000000Z
  Duration: 00:00:01.00, start: 0.000000, bitrate: 2258 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 2234 kb/s (default)
    Metadata:
      creation_time   : 2021-12-08T15:44:06.000000Z
      handler_name    : Core Media Audio
Stream mapping:
  Stream #0:0 -> #0:0 (aac (native) -> mp3 (libmp3lame))

Output #0, mp3, to '18380889311644327118.mp3':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    TSSE            : Lavf58.29.100
    Stream #0:0(und): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2021-12-08T15:44:06.000000Z
      handler_name    : Core Media Audio
      encoder         : Lavc58.54.100 libmp3lame
size=      17kB time=00:00:01.01 bitrate= 135.5kbits/s speed=37.2x
video:0kB audio:16kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.343701%


  


  As you can see, the duration is 01.00 second. And this happens with all recorded files.

  


  How to convert the entire file (which is 12 seconds long) to its full length ?

  

  

  


  Note : It seems that the recorded file does not have a length specified. Under Windows I renamed the file, adding an extension ".m4a" and opened the file properties :

  


  

  


  The length attribute is empty.

  


• fastest ways of cropping a fixed size image into 9 fixed size crops

  18 septembre 2022, par bit_scientist

  I have thousands of images in a folder and I need to crop each image(3840x2160) into 9 crops (1280x720) with the fastest way possible. The cropped images should preserve all the details of the original image as it may contain small objects of interest. I found that image_slicer does the job, but not sure about its speed.

  


  from image_slicer import slice
slice('cake.png', 9)


  


  I also looked at PIL (image_slicer uses it), Imagemagick and some other similar libraries, but was not able to evaluate their speed. Maybe ffmpeg has some line command to achieve my goal.

  


  Eventually, I need a Windows executable file where a user inserts a full path to images and gets cropped images for each image in the new folder.

  


• How to concat two videos with different aspect ratio with pad to later video and make intro the same size ?

  25 septembre 2021, par code0x00

  I want to concat two videos with different aspect ratio with padding to 2nd video if the 2nd video is of small resolution than the 1st video.

  


  for eg.

  


  I have a intro video(1920x1080) and a main video(480x480)

  


  so i want to add padding to main video so it becomes 16:9 which would make main video 848x480 and also make the intro that size too.

  


  I have tried this

  


  ffmpeg -ss 00:00:00 -t 00:00:10 -i ./intro.webm -i ./main.mkv -filter_complex "[0:v]scale=1920:1080:force_original_aspect_ratio=decrease[s0];[s0]fps=fps=30[s1];[s1]setsar=1[s2];[s2]pad=1920:1080:ow-iw/2:oh-ih/2[s3];[1:v]scale=1920:1080:force_original_aspect_ratio=decrease[s4];[s4]fps=fps=30[s5];[s5]setsar=1[s6];[s6]pad=1920:1080:ow-iw/2:oh-ih/2[s7];[s3][0:a][s7][1:a]concat=a=1:n=2:v=1[s8][s9]" -map "[s8]" -map "[s9]" -bitexact -c:a aac -crf 28 -map_metadata -1 -pix_fmt yuv420p -preset fast -report -tag:v hvc1 -vcodec libx265 -y output.mp4


  


  but it just scale the video to 1920x1080, is there a way :
to make main video so it becomes 16:9 which would make main video 848x480 and also make the intro that size too.

  


  I have also tried this :

  


  ffmpeg -ss 00:00:00 -t 00:00:10 -i intro.webm -i main.mp4 -filter_complex "[0]split[base][full];[base]trim=0:5,drawbox=t=fill[base];[1][base]scale2ref=iw:ih:force_original_aspect_ratio=decrease:flags=spline[2nd][base];[base][2nd]overlay='(W-w)/2':'(H-h)/2'[padded];[full][0:a][padded][1:a]concat=n=2:v=1:a=1[v][a]" -c:v libx264 -c:a aac -strict -2 -map "[v]" -map "[a]" output.mp4


  


  But is it not changing the intro video resolution

  


  EDIT

  


  I have managed to make 2nd command work but it shows aspect ratio 16:9 but the width is same 480x480 ?

  


  ffmpeg -ss 00:00:00 -t 00:00:10 -i intro.webm -i main1.mp4 -filter_complex "[0][1]scale2ref=iw:ih[intro][main];[intro]drawbox=t=fill[intro-bg];[0][intro-bg]scale2ref=iw:ih:force_original_aspect_ratio=decrease:flags=spline[intro][intro-bg];[intro-bg][intro]overlay=x='(W-w)/2':y='(H-h)/2'[intro-resized];[intro-resized][0:a][main][1:a]concat=n=2:v=1:a=1:unsafe=1[v][a]" -map '[v]' -map '[a]' -movflags +faststart -acodec aac  -b:v 1000k -bt 1000k -y -2pass true -r 30 -preset medium output.mp4


  


  and when i change as per aspect ratio i get an error :

  


  ffmpeg -ss 00:00:00 -t 00:00:10 -i intro.webm -i main1.mp4 -filter_complex "[0][1]scale2ref=ih*16/9:-1[intro][main];[intro]drawbox=t=fill[intro-bg];[0][intro-bg]scale2ref=iw:ih:force_original_aspect_ratio=decrease:flags=spline[intro][intro-bg];[intro-bg][intro]overlay=x='(W-w)/2':y='(H-h)/2'[intro-resized];[intro-resized][0:a][main][1:a]concat=n=2:v=1:a=1:unsafe=1[v][a]" -map '[v]' -map '[a]' -movflags +faststart -acodec aac  -b:v 1000k -bt 1000k -y -2pass true -r 30 -preset medium output.mp4


  


  Too many inputs specified for the "pad" filter.


  


  Is there a way i can change the width and height too ?