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• How determine raw AAC frame size without ADTS header in .mp4 ?

  26 août 2022, par isrepeat

  I am trying to restore corrupted video with sound. Video restore good because each video frame consist frist bytes header with size. But in .mp4 AAC saved as raw byte stream without ADTS header.

  


  At first I wanted take all bytes data between 2 video frames and save in as 1 audio frame, but there may be more the one audio frame. Each AAC frame started at 0x21 ... .... So i am tryied split all received data by '0x21' separator, but in not always work because some AAC-samples may consist inside several value = 0x21.

  


  I found out that ffmpeg when read .mp4 format parse moov atom -> ... -> stsz (Sample Size). But if moov atom was lost how I can restore correct AAC sizes for audio frames ?

  


• How do we determine the required dependencies for ffmpeg

  15 mars 2021, par user3656901

  I've installed ffmpeg on ubuntu. I am going to copy the compiled ffmpeg and required dependencies to a directory and copy that directory to another machine. This way we can run ffmpeg on another machine without installation. How do we determine the required dependencies to copy ? Saw instruction on this page : https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu, but it didn't explain the required dependencies for ffmpeg.

  


  When I used ldd ffmpeg, I got something like :

  


      linux-vdso.so.1 (0x00007fffe20fd000)
    libavdevice.so.58 => /lib/x86_64-linux-gnu/libavdevice.so.58 (0x00007fc116e90000)
    libavfilter.so.7 => /lib/x86_64-linux-gnu/libavfilter.so.7 (0x00007fc116b10000)
    libavformat.so.58 => /lib/x86_64-linux-gnu/libavformat.so.58 (0x00007fc116890000)
    libavcodec.so.58 => /lib/x86_64-linux-gnu/libavcodec.so.58 (0x00007fc1152d0000)
    libavresample.so.4 => /lib/x86_64-linux-gnu/libavresample.so.4 (0x00007fc1152a0000)
    libpostproc.so.55 => /lib/x86_64-linux-gnu/libpostproc.so.55 (0x00007fc115270000)


  


  Are those the required dependencies ? It didn't list the files under bin, include or share folders.

  


• How to determine WxH of video using ffprobe java android studio

  15 février 2021, par sara bensarghin

  I'm trying to concatenate two videos on Android. I would like to know how to work with ffprobe to determine WxH of the first video and scaling the second video to the resolution of the first video.

  


          a(new String[]{"-y",
                        "-ss",
                        String.valueOf(this.m),
                        "-t",
                        String.valueOf(this.a),
                        "-i",
                        (String) FileUtils.myUri.get(0),
                        "-ss",
                        String.valueOf(this.n),
                        "-t",
                        String.valueOf(this.b),
                        "-i",
                        (String) FileUtils.myUri.get(1),
                        "-strict",
                        "experimental",
                        "-filter_complex",
                        "[0:v]scale=320x240," +
                                "setsar=1:1[v0];[1:v]scale=320x240,setsar=1:1[v1];[v0][v1] concat=n=2:v=1",
                        "-ab",
                        "48000",
                        "-ac",
                        "2",
                        "-ar",
                        "22050",
                        "-s",
                        "320x240",
                        "-r",
                        "15",
                        "-b",
                        "2097k",
                        "-vcodec",
                        "mpeg4",
                        this.d},
                this.d);
    }