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Sur d’autres sites (10626)

  • Why is ffmpeg output video contrast / brightness too bright ?

    24 février 2024, par danday74

    I have a .mov file which I run through ffmpeg to create HLS segments / chunks. However, when I playback the HLS video it is too bright.

    


    For a sanity check, I ran the same .mov video file through the FlowPlayer processing pipeline and the results were the same, the output video is too bright !

    


    I have a number of videos. Most do not have this problem but some (and only some) of the .mov files exhibit this issue.

    


    A broken video stream reports (see below for full output) :

    


    Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 1920x1080, 8507 kb/s, 29.98 fps, 29.97 tbr, 600 tbn (default)


    


    A working video stream reports (see below for full output) :

    


    Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 45457 kb/s, 29.99 fps, 29.97 tbr, 600 tbn (default)


    


    Is this something to do with hevc v h264 (whatever they mean) ?

    


    Incidentally, I am using the native HTML5 video player in conjunction with hls.js to playback the videos.

    


    How do I fix this ?

    


    Here is my ffmpeg command :

    


    ffmpeg -i "rgb.mov" \
  -v warning -preset ultrafast -g 59.96 -sc_threshold 0 \
  -map 0:0 -map 0:0 \
  -s:v:0 1920x1080 -c:v:0 libx264 -b:v:0 4521k \
  -s:v:1 1920x1080 -c:v:1 libx264 -b:v:1 7347k \
  -var_stream_map "v:0 v:1" \
  -master_pl_name master.m3u8 -f hls \
  -hls_time 6 -hls_list_size 0 -hls_playlist_type vod \
  -hls_segment_filename "hls/v%v/chunk%d.ts" "hls/v%v/index.m3u8"


    


    And here are some screenshots showing the original video in comparison to the output video.

    


    ORIGINAL :

    


    enter image description here

    


    OUTPUT :

    


    enter image description here

    


    For the problem video ffmpeg -i "rgb.mov" -hide_banner gives :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rgb.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2021-08-03T11:23:40.000000Z
    com.apple.quicktime.location.accuracy.horizontal: 3.594173
    com.apple.quicktime.location.ISO6709: +51.5483+000.1628+000.459/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 12 Pro
    com.apple.quicktime.software: 14.7.1
    com.apple.quicktime.creationdate: 2021-08-03T12:23:40+0100
  Duration: 00:00:54.54, start: 0.000000, bitrate: 8730 kb/s
  Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668), yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 1920x1080, 8507 kb/s, 29.98 fps, 29.97 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : HEVC
    Side data:
      DOVI configuration record: version: 1.0, profile: 8, level: 4, rpu flag: 1, el flag: 0, bl flag: 1, compatibility id: 4
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 172 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Metadata
  Stream #0:3[0x4](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Metadata
  Stream #0:4[0x5](und): Data: none (mebx / 0x7862656D), 34 kb/s (default)
    Metadata:
      creation_time   : 2021-08-03T11:23:40.000000Z
      handler_name    : Core Media Metadata
At least one output file must be specified


    


    For a working video ffmpeg -i "rgb.mov" -hide_banner gives :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rgb.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2021-12-01T10:53:47.000000Z
    com.apple.quicktime.location.accuracy.horizontal: 4.785777
    com.apple.quicktime.location.ISO6709: +51.5485+000.1627+012.533/
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 12 Pro
    com.apple.quicktime.software: 14.8.1
    com.apple.quicktime.creationdate: 2021-12-01T10:53:47+0000
  Duration: 00:00:36.35, start: 0.000000, bitrate: 45692 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160, 45457 kb/s, 29.99 fps, 29.97 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : H.264
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 188 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Metadata
  Stream #0:3[0x4](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Metadata
  Stream #0:4[0x5](und): Data: none (mebx / 0x7862656D), 34 kb/s (default)
    Metadata:
      creation_time   : 2021-12-01T10:53:47.000000Z
      handler_name    : Core Media Metadata
At least one output file must be specified


    


  • How can I set a Clean Aperture on a QuickTime file in ffmpeg ? [closed]

    5 novembre 2024, par blackirishman

    I am using ffmpeg to convert files to QuickTime containers. I understand that certain QuickTime files requires clap atoms, ie "This is a mandatory extension for all uncompressed Y´CbCr data formats."

    


    https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html#//apple_ref/doc/uid/TP40000939-CH205-125850

    


    Is there a way to specify a clap atom when using ffmpeg to output a QuickTime file ? Otherwise would there be harm in adding a clap atom at the end of the file assuming that I updated any file length field ? Lastly, assuming that there is not doubt as to the proper viewable/usable pixel dimensions of my file, is a clap even necessary ?

    


  • Can I record a video without using UIImagePickerController ?

    24 mai 2016, par SUKIYAKI

    Can I record a video without using UIImagePickerController ?
    Of course without needing to jailbreak or anything else that would cause the App Store to reject the app.

    I think there is a way to access video device not using UIImagePickerController because these camera applications can record video and work on iPhone 2G/3G which utilizes ffmpeg :

    I pick this code up by googling.

    AVFormatParameters formatParams;
    
AVInputFormat *iformat;
    

    
formatParams.device = "/dev/video0";
    
formatParams.channel = 0;
    
formatParams.standard = "ntsc";
    
formatParams.width = 640;
    
formatParams.height = 480;
    
formatParams.frame_rate = 29;
    
formatParams.frame_rate_base = 1;
    
filename = "";
    
iformat = av_find_input_format("video4linux");
    

    
av_open_input_file(&ffmpegFormatContext,
    
                 filename, iformat, 0, &formatParams);

    This code tell me how to open camera device, but I don’t know device path of iPhone.

    How do iVideoCamera and iVidCam record video ?

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