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    MédiaSPIP ne modifie jamais le document original mis en ligne.
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  • Participer à sa traduction

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  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
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Sur d’autres sites (13392)

  • fluent-ffmpeg concatenate files ends up with wrong length

    24 juillet 2021, par Hugo Cox

    I have the following input file :

    


    ffconcat version 1.0
file '../tmp/59bd6a7896654d0b0c00705f/vidR/intro.mp4' #0
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out003.mp4' #1
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #2
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #2
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #2
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #2
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #2
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #2
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out007.mp4' #3
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #4
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #4
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out013.mp4' #5
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #6
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #6
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #6
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #6
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #6
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #6
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out017.mp4' #7
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #8
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #8
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #8
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #8
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #8
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #8
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out021.mp4' #9
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #10
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #10
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #10
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #10
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #10
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #10
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out025.mp4' #11
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #12
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #12
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #12
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #12
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out028.mp4' #13
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #14
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #14
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #14
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #14
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #14
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #14
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out032.mp4' #15
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #16
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #16
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out034.mp4' #17
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #18
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #18
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #18
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #18
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out037.mp4' #19
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #20
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #20
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out039.mp4' #21
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #22
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #22
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out041.mp4' #23
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #24
file '../intersegment/paddingsegment_h264_2.6s_1920x1080_30fps.mp4' #24
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out043.mp4' #25
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #26
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #26
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out045.mp4' #27
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #28
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #28
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out047.mp4' #29
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #30
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #30
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out049.mp4' #31
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #32
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #32
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out051.mp4' #33
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #34
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #34
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out053.mp4' #35
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #36
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #36
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out055.mp4' #37
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #38
file '../intersegment/paddingsegment_h264_2.6s_1920x1080_30fps.mp4' #38
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out057.mp4' #39
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #40
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #40
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out059.mp4' #41
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #42
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #42
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out061.mp4' #43
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #44
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #44
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out063.mp4' #45
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #46
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #46
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #46
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out065.mp4' #47
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #48
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #48
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #48
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out067.mp4' #49
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #50
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #50
file '../intersegment/paddingsegment_h264_2.6s_1920x1080_30fps.mp4' #50
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out070.mp4' #51
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #52
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #52
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #52
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #52
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #52
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #52
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out074.mp4' #53
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #54
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #54
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out076.mp4' #55
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #56
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #56
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #56
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #56
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #56
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out080.mp4' #57
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #58
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #58
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #58
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #58
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #58
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #58
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out084.mp4' #59
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #60
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #60
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #60
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #60
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #60
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #60
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out089.mp4' #61
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #62
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #62
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #62
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #62
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #62
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #62
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out093.mp4' #63
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #64
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #64
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #64
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #64
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out096.mp4' #65
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #66
file '../intersegment/paddingsegment_h264_2.6s_1920x1080_30fps.mp4' #66
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out098.mp4' #67
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #68
file '../intersegment/paddingsegment_h264_2.6s_1920x1080_30fps.mp4' #68
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out100.mp4' #69
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #70
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #70
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out102.mp4' #71
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #72
file '../intersegment/paddingsegment_h264_1.6s_1920x1080_30fps.mp4' #72
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out104.mp4' #73
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #74
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #74
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #74
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #74
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #74
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #74
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #74
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out109.mp4' #75
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #76
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #76
file '../intersegment/paddingsegment_h264_2.6s_1920x1080_30fps.mp4' #76
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out112.mp4' #77
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #78
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #78
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out114.mp4' #79
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4' #80
file '../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4' #80
file '../tmp/59bd6a7896654d0b0c00705f/vidR/out119.mp4' #81
file '../tmp/59bd6a7896654d0b0c00705f/vidR/outro.mp4' #82


    


    However, when I use the following command :

    


                ffmpeg(__dirname + '/log/vidR_concatenate.txt')
                .inputFormat('concat')
                .inputOptions([
                    '-safe 0'
                ]).outputOptions([
                    '-c copy'
                ]).output(__dirname + '/output/' + ID + '/video/1080p/' + ID + '-R-1080p.mp4')
                .on('start', function (commandLine) {
                    console.log('Spawned Ffmpeg with command: ' + commandLine);
                })
                .on('error', function (err, stdout, stderr) {
                    console.log('An error occurred: ' + err.message, err, stderr);
                })
                .on('progress', function (progress) {
                    console.log('Processing: ' + progress.percent + '% done')
                })
                .on('end', function (err, stdout, stderr) {
                    console.log('Finished vidR processing!' /*, err, stdout, stderr*/)
                    resolve()
                })
                .run()


    


    I do not end up with a video length that is the sum of all individual videos !

    


    ffprobe -i ../intersegment/intersegment_h264_3s_1920x1080_30fps.mp4 :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'intersegment/intersegment_h264_3s_1920x1080_30fps.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:03.00, start: 0.000000, bitrate: 24 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 19 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler


    


    ffprobe -i ../intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4 :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'intersegment/paddingsegment_h264_0.6s_1920x1080_30fps.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:00.60, start: 0.000000, bitrate: 45 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 30 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler


    


    ffprobe -i ../tmp/59bd6a7896654d0b0c00705f/vidR/intro.mp4 :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tmp/59bd6a7896654d0b0c00705f/vidR/intro.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:14.80, start: 0.000000, bitrate: 21 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 17 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler


    


    ffprobe -i ../tmp/59bd6a7896654d0b0c00705f/vidR/outro.mp4 :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tmp/59bd6a7896654d0b0c00705f/vidR/outro.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:05.30, start: 0.000000, bitrate: 22 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 18 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler


    


    ffprobe -i ../tmp/59bd6a7896654d0b0c00705f/vidR/out003.mp4 :

    


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tmp/59bd6a7896654d0b0c00705f/vidR/out003.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : Big Buck Bunny, Sunflower version
    artist          : Blender Foundation 2008, Janus Bager Kristensen 2013
    composer        : Sacha Goedegebure
    encoder         : Lavf58.29.100
    comment         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
    genre           : Animation
  Duration: 00:00:08.40, start: 0.000000, bitrate: 3703 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 3699 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : GPAC ISO Video Handler


    


    I thought all the fps, tbr, tbn and tbc are the same, so what is the problem ??
It is off several seconds from the total sum of each individual file !

    


  • Converting RGB images into lossless video with avconv / ffmpeg [migrated]

    19 mai 2013, par despens

    I am trying to convert a series of PNG24 images containing a screen animation to a lossless video, so that every pixel is reproduced exactly as it was in the original. But avconv (and ffmpeg) both produce the same, unsatisfying results, which seem to stem from a colospace conversion going wrong.

    This is the version of avconv I am using :

    avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    
  built on Apr  2 2013 17:02:36 with gcc 4.6.3

    Each of the images is 1280×800 pixels in size. They do not contain any photographic motives, but specially dithered patterns.

    I used the qtrle codec because apparently this is a lossless codec that works very much like animated GIFs or animated PNGs. However, during the conversion to video there seems to happen a color space conversion ("filter") that is messing with the pixels.

    This is the avconv output :

    $ avconv -f image2 -r 30 -i frames.png/wth-%08d.png -vcodec qtrle -pix_fmt rgb24 -t 15 qtrle-30fps-rgb.mov
    
avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    
  built on Apr  2 2013 17:02:36 with gcc 4.6.3
    
Input #0, image2, from 'frames.png/wth-%08d.png':
    
  Duration: 00:11:17.96, start: 0.000000, bitrate: N/A
    
    Stream #0.0: Video: png, bgra, 1280x800, 30 fps, 30 tbr, 30 tbn, 30 tbc
    
File 'qtrle-30fps-rgb.mov' already exists. Overwrite ? [y/N] y
    
[buffer @ 0x740a00] w:1280 h:800 pixfmt:bgra
    
[avsink @ 0x742ac0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
    
[scale @ 0x743680] w:1280 h:800 fmt:bgra -> w:1280 h:800 fmt:rgb24 flags:0x4
    
Output #0, mov, to 'qtrle-30fps-rgb.mov':
    
  Metadata:
    
    encoder         : Lavf53.21.1
    
    Stream #0.0: Video: qtrle, rgb24, 1280x800, q=2-31, 200 kb/s, 30 tbn, 30 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (png -> qtrle)
    
Press ctrl-c to stop encoding
    
frame=  450 fps= 22 q=0.0 Lsize=  126056kB time=15.00 bitrate=68843.4kbits/s    
    
video:126052kB audio:0kB global headers:0kB muxing overhead 0.003441%

    This is an original PNG image file :

    enter image description here

    This is a screenshot of the video being replayed :

    Screenshot of the video being replayed

    Please note that you need to see these images in their original 1280×800 resolution to notice the differences.

    Here is a side-by-side comparison, with the left picture being the original and the right one the outcome after video encoding :

    enter image description here

    Is there any way I can produce a truly lossless, pixel-perfect video file from a series of PNGs ?

  • Using ffmpeg static libraries in an visual studio explress C++ 2010 project

    29 octobre 2015, par Yvo Götz

    As the title says, I have been trying to get ffmpeg/libav libraries to work in MSVC++ 2010.
    However, I keep running in the following error while coding on debug mode.

    code :

    extern "C" 
    
{
    
    #ifndef __STDC_CONSTANT_MACROS
    
    #define __STDC_CONSTANT_MACROS
    
    #endif
    
    #include 
    
    #include 
    
    #include 
    
    #include 
    
}
    
int main( int argc, char* argv[] ) 
    
{
    
    av_register_all();
    
    return 0;
    
}

    console :

    1>------ Build started: Project: ffmpeg, Configuration: Debug Win32 ------
    
1>ffmpeg.obj : error LNK2019: unresolved external symbol _av_register_all referenced in       function _main
    
1>C:\Users\okki\documents\visual studio 2010\Projects\ffmpeg\Debug\ffmpeg.exe : fatal    error LNK1120: 1 unresolved externals
    
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

    I used zeranoe’s latest build git-56ba331 (2013-05-14).

    And I have tried the following to fix this :

    • configuring the project to look for both the x64 and x86 libraries.
    • Add the DLLs from the ’shared’ package to both library folders.
    • Add the library directory to both the linker options and VC++ Directories.

    I have been stuck on this for a while, and any suggestion can help.
    If any extra info is needed I will happily provide.

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