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  • FFmpeg filter_complex to merge audio from two files fails without an error due to album cover PNG stream

    13 décembre 2023, par kaushal

    When you run FFmpeg filter_complex command to process two mp3 files and merge them into one, the command runs successfully, the output mp3 file is generated. No errors are reported. But the output fails to run. The result log from FFmpeg looks something like this, which points to an PNG stream in one of the mp3.

    


    [mp3 @ 00000215d251e7c0] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'C:\\vid gen\\Track_ Outwild x She Is Jules - Golden [NCS Release].mp3':
  Metadata:
    artist          : Outwild x She Is Jules
    album_artist    : Outwild x She Is Jules
    TCM             : Outwild, She Is Jules
    album           : Golden [Single]
    title           : Golden
    genre           : Electronic
    date            : 2021
  Duration: 00:04:09.60, 
start: 0.000000, bitrate: 378 kb/s
  Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 320 kb/s
  Stream #0:1: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 3000x3000, 90k tbr, 90k tbn (attached pic)
    Metadata:
      comment         : Other
[mp3 @ 00000215d253f380] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'E:\voiceover.mp3':
  Duration: 00:00:51.96, start: 0.000000, bitrate: 32 kb/s
  Stream #1:0: Audio: mp3, 24000 Hz, mono, fltp, 32 kb/s
Stream mapping:
  Stream #0:0 (mp3float) -> volume:default (graph 0)
  Stream #1:0 (mp3float) -> adelay:default (graph 0)
  amerge:default (graph 0) -> Stream #0:0 (libmp3lame)
  Stream #0:1 -> #0:1 (mjpeg (native) -> png (native))
Press [q] to stop, [?] for help
[swscaler @ 00000215d46ff480] deprecated pixel format used, make sure you did set range correctly
    Last message repeated 3 times
[Parsed_amerge_6 @ 00000215d470d2c0] No channel layout for input 1
Output #0, mp3, to 'output_test.mp3':
  Metadata:
    TPE1            : Outwild x She Is Jules
    TPE2            : Outwild x She Is Jules
    TCM             : Outwild, She Is Jules
    TALB            : Golden [Single]
    TIT2            : Golden
    TCON            : Electronic
    TDRC            : 2021
    TSSE            : Lavf60.18.100
  Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp\r\rame=    0 fps=0.0 q=0.0 size=       0kB time=-00:00:00.02 bitrate=N/A speed=N/A    \rframe=    0 fps=0.0 q=0.0 size=       0kB time=-00:00:00.02 bitrate=N/A speed=N/A    \r[out#0/mp3 @ 00000215d2537400] video:3696kB audio:2kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.011831%
frame=    1 fps=0.8 q=-0.0 Lsize=    3698kB time=00:00:00.07 bitrate=415140.5kbits/s speed=0.0601x


    


  • FFmpeg cannot extract correct first frame - always extract the second frame [closed]

    21 octobre 2024, par Cai Yu

    I am on macos Ventura 13.2.1, on Macbook Pro M1Max.

    


    The video is number counting animation video. From 2 to 125. The number on first frame is 2. The number on last frame is 125. The number plus one on each frame. You can download the video here.

    


    NOTE that :
First, you hit space bar to play it in Finder, you can see the first frame of the video is number 2.

    


    Second, in professional Video editing software - davinci resolve, on the timeline, you can see the first frame is number 2.

    


    Now I try to use FFmpeg to extract the first frame of the video.
First Try :

    


    ffmpeg -i /Users/chris/Downloads/2to125.mov -vframes 1 /Users/chris/Downloads/1.png


    


    The output png image is number 3. So it's actually the second frame.

    


    Second try :

    


    ffmpeg -i /Users/chris/Downloads/2to125.mov -frames:v 1 /Users/chris/Downloads/1.png


    


    The output png image is still the second frame - the number 3.

    


    Third try :

    


    ffmpeg -i /Users/chris/Downloads/2to125.mov -vf "select=eq(n\,0)" -q:v 3 /Users/chris/Downloads/1.png


    


    The output image is sitll the wrong second frame.

    


    NOTE that :

    


    first : all these three method are from internet. And a lot of people voted correct answer for this question.

    


    second : all their output on my system is the incorrect second frame, not the first frame.

    


    I cannot find what's wrong. Hope friend here help me.

    


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