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  • FFMPEG Api conversion from YUV420P to RGB produces strange output

    20 novembre 2024, par fasc8

    I'm using the FFMPEG Api in Rust to get RGB images from video files.

    


    While some videos work correct and I get the frames back as expected, some work not. Or at least the result is not the way I expected it to be.

    


    The code I use in Rust :

    


    ffmpeg::init().unwrap();

let in_ctx = input(&Path::new(source)).unwrap();
let input = in_ctx
    .streams()
    .best(Type::Video)
    .ok_or(ffmpeg::Error::StreamNotFound)?;

let decoder = input.codec().decoder().video()?;

let scaler = Context::get(
    decoder.format(),
    decoder.width(),
    decoder.height(),
    Pixel::RGB24,
    decoder.width(),
    decoder.height(),
    Flags::FULL_CHR_H_INT | Flags::ACCURATE_RND,
)?; // <--- Is basically sws_getContext

// later to get the actual frame
let mut decoded = Video::empty();
if self.decoder.receive_frame(&mut decoded).is_ok() {
    let mut rgb_frame = Video::empty();
    self.scaler.run(&decoded, &mut rgb_frame)?; // <--- Does sws_scale
    println!("Converted Pixel Format: {}", rgb_frame.format() as i32);
    Ok(Some(rgb_frame))
}


    


    Which should roughly translate to C like so :

    


    // Get the context and video stream
SwsContext * ctx = sws_getContext(imgWidth, imgHeight,
                              imgFormat, imgWidth, imgHeight,
                              AV_PIX_FMT_RGB24, 0, 0, 0, 0);
sws_scale(ctx, decoded.data, decoded.linesize, 0, decoded.height, rgb_frame.data, rbg_frame.linesize);


    


    And like I said earlier, sometimes it works fine and I get the expected frame back. But sometimes I get something like this :
Weird result image

    


    I saved the images as .ppm files for quick visual comparison. I used this method, which basically writes the bytes to a file with a simple .ppm header :

    


    fn save_file(frame: &Video, index: usize) -> std::result::Result<(), std::io::Error> 
{
    let mut file = File::create(format!("frame{}.ppm", index))?;
    file.write_all(format!("P6\n{} {}\n255\n", frame.width(), frame.height()).as_bytes())?;
    file.write_all(frame.data(0))?;
    Ok(())
}


    


    Here you can see that on the left side there is a good image result vs. on the right side there is a bad image result.
Comparison of the .ppm files

    


    To come to the question now :

    


    Why is this happening. I tested everything on my side and the only thing left is ffmpeg conversion. FFMPEG seems to convert these two test files differently even though it reports YUV420P as format for both. I cannot figure out what the difference may be...

    


    Here the info for the two video files i used :

    


    Good video file :

    


    General
Complete name                            : /mnt/smb/Snapchat-174933781.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42)
File size                                : 1.90 MiB
Duration                                 : 9 s 612 ms
Overall bit rate                         : 1 661 kb/s
Encoded date                             : UTC 2021-07-28 22:09:36
Tagged date                              : UTC 2021-07-28 22:09:36
eng                                      : -180.00

Video
ID                                       : 512
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 1 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 1 frame
Format settings, GOP                     : M=1, N=30
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 9 s 598 ms
Bit rate                                 : 1 597 kb/s
Width                                    : 480 pixels
Height                                   : 944 pixels
Display aspect ratio                     : 0.508
Frame rate mode                          : Variable
Frame rate                               : 29.797 FPS
Minimum frame rate                       : 15.000 FPS
Maximum frame rate                       : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.118
Stream size                              : 1.83 MiB (96%)
Title                                    : Snap Video
Language                                 : English
Encoded date                             : UTC 2021-07-28 22:09:36
Tagged date                              : UTC 2021-07-28 22:09:36
Color range                              : Full
colour_range_Original                    : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.601
transfer_characteristics_Original        : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC

Audio
ID                                       : 256
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 9 s 612 ms
Bit rate mode                            : Constant
Bit rate                                 : 62.0 kb/s
Channel(s)                               : 1 channel
Channel layout                           : C
Sampling rate                            : 44.1 kHz
Frame rate                               : 43.066 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 73.3 KiB (4%)
Title                                    : Snap Audio
Language                                 : English
Encoded date                             : UTC 2021-07-28 22:09:36
Tagged date                              : UTC 2021-07-28 22:09:36


    


    Bad video file :

    


    General
Complete name                            : /mnt/smb/Snapchat-1989594918.mp4
Format                                   : MPEG-4
Format profile                           : Base Media / Version 2
Codec ID                                 : mp42 (isom/mp42)
File size                                : 2.97 MiB
Duration                                 : 6 s 313 ms
Overall bit rate                         : 3 948 kb/s
Encoded date                             : UTC 2019-07-11 06:43:04
Tagged date                              : UTC 2019-07-11 06:43:04
com.android.version                      : 9

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Baseline@L3.1
Format settings                          : 1 Ref Frames
Format settings, CABAC                   : No
Format settings, Reference frames        : 1 frame
Format settings, GOP                     : M=1, N=30
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 6 s 313 ms
Bit rate                                 : 3 945 kb/s
Width                                    : 496 pixels
Height                                   : 960 pixels
Display aspect ratio                     : 0.517
Frame rate mode                          : Variable
Frame rate                               : 29.306 FPS
Minimum frame rate                       : 19.767 FPS
Maximum frame rate                       : 39.508 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.283
Stream size                              : 2.97 MiB (100%)
Title                                    : VideoHandle
Language                                 : English
Encoded date                             : UTC 2019-07-11 06:43:04
Tagged date                              : UTC 2019-07-11 06:43:04
Color range                              : Limited
Color primaries                          : BT.709
Transfer characteristics                 : BT.709
Matrix coefficients                      : BT.709
Codec configuration box                  : avcC


    


    Or as a diff image : image diff

    


    The problem is that I am not that familiar with ffmpeg yet I don't know all the quirks it has.

    


    I hope someone can point me in the right direction.

    


  • ffmpeg performance on raspberry pi

    20 août 2021, par Rudi

    I'm running ffmpeg on a rasperry pi 4. I'm capturing the signal of an usb device.

    


    ffprobes output is :

    


    pi@skycam:~ $ ffprobe /dev/video0
ffprobe version 4.1.4-1+rpt7~deb10u1 Copyright (c) 2007-2019 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
  WARNING: library configuration mismatch
  avutil      configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avcodec     configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avformat    configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avdevice    configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avfilter    configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  avresample  configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  swscale     configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  swresample  configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  postproc    configuration: --prefix=/usr --extra-version='1+rpt7~deb10u1' --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disable-doc --disable-programs
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 1230.660915, bitrate: 1990656 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 1990656 kb/s, 60 fps, 60 tbr, 1000k tbn, 1000k tbc


    


    the ffmpeg call i'm using is :

    


    bin/ffmpeg -loglevel quiet -re -f v4l2 -i /dev/video0 -tune zerolatency -preset ultrafast -pix_fmt yuv420p out.mkv


    


    put the framerate starts at around 20 and increases slowly to 36. Also when reviewing the output videos i feel like i see a bit of a framedrop so the video is not as smooth as the input.

    


    Is this due to a lack of power of the raspberry or are there any tweaks i could use to improve performance ? I don't care about the output format, framerate or resolution

    


    thank you very much

    


  • Why is the filesize different when swapping audio tracks using ffmeg ?

    20 août 2021, par Brian

    I have a movie that I have encoded using Handbrake on a Mac a long time ago. When I encoded the movie, I put the stereo audio as track 1 and the 5.1 audio as track 2. The starting filesize is 853,320,914 bytes. Below is the data from ffprobe.

    


    ffprobe version 4.2.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Annabelle - Comes Home (2019).m4v':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2020-04-06T22:40:36.000000Z
    encoder         : HandBrake 1.1.2 2018090500
  Duration: 01:46:04.86, start: 0.000000, bitrate: 1072 kb/s
    Chapter #0:0: start 0.000000, end 476.986000
    Metadata:
      title           : Chapter 1
    Chapter #0:1: start 476.986000, end 933.608000
    Metadata:
      title           : Chapter 2
    Chapter #0:2: start 933.608000, end 1441.449000
    Metadata:
      title           : Chapter 3
    Chapter #0:3: start 1441.449000, end 1976.358000
    Metadata:
      title           : Chapter 4
    Chapter #0:4: start 1976.358000, end 2579.753000
    Metadata:
      title           : Chapter 5
    Chapter #0:5: start 2579.753000, end 3149.030000
    Metadata:
      title           : Chapter 6
    Chapter #0:6: start 3149.030000, end 3726.941000
    Metadata:
      title           : Chapter 7
    Chapter #0:7: start 3726.941000, end 3973.520000
    Metadata:
      title           : Chapter 8
    Chapter #0:8: start 3973.520000, end 4504.676000
    Metadata:
      title           : Chapter 9
    Chapter #0:9: start 4504.676000, end 4904.409000
    Metadata:
      title           : Chapter 10
    Chapter #0:10: start 4904.409000, end 5421.592000
    Metadata:
      title           : Chapter 11
    Chapter #0:11: start 5421.592000, end 5998.001000
    Metadata:
      title           : Chapter 12
    Chapter #0:12: start 5998.001000, end 6364.075000
    Metadata:
      title           : Chapter 13
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 720x360 [SAR 32:27 DAR 64:27], 519 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s (default)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : Stereo
    Stream #0:2(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : Surround
    Side data:
      audio service type: main
    Stream #0:3(eng): Data: bin_data (text / 0x74786574)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : SubtitleHandler
Unsupported codec with id 100359 for input stream 3


    


    My goal is to swap the stereo audio track with the 5.1 audio track and make the 5.1 audio track the default without having to reencode. To do this, I used the following command :

    


    ffmpeg -i "Annabelle - Comes Home (2019)/Annabelle - Comes Home (2019)_old.m4v" -map 0:v:0 -map 0:a:1 -map 0:a:0 -disposition:a:0 default -disposition:a:1 none -c copy "Annabelle - Comes Home (2019)/Annabelle - Comes Home (2019).m4v"

    


    Everything works as it should, I think anyways as I didn't get any errors...

    


    ffmpeg version 4.2.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Annabelle - Comes Home (2019)/Annabelle - Comes Home (2019)_old.m4v':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2020-04-06T22:40:36.000000Z
    encoder         : HandBrake 1.1.2 2018090500
  Duration: 01:46:04.86, start: 0.000000, bitrate: 1072 kb/s
    Chapter #0:0: start 0.000000, end 476.986000
    Metadata:
      title           : Chapter 1
    Chapter #0:1: start 476.986000, end 933.608000
    Metadata:
      title           : Chapter 2
    Chapter #0:2: start 933.608000, end 1441.449000
    Metadata:
      title           : Chapter 3
    Chapter #0:3: start 1441.449000, end 1976.358000
    Metadata:
      title           : Chapter 4
    Chapter #0:4: start 1976.358000, end 2579.753000
    Metadata:
      title           : Chapter 5
    Chapter #0:5: start 2579.753000, end 3149.030000
    Metadata:
      title           : Chapter 6
    Chapter #0:6: start 3149.030000, end 3726.941000
    Metadata:
      title           : Chapter 7
    Chapter #0:7: start 3726.941000, end 3973.520000
    Metadata:
      title           : Chapter 8
    Chapter #0:8: start 3973.520000, end 4504.676000
    Metadata:
      title           : Chapter 9
    Chapter #0:9: start 4504.676000, end 4904.409000
    Metadata:
      title           : Chapter 10
    Chapter #0:10: start 4904.409000, end 5421.592000
    Metadata:
      title           : Chapter 11
    Chapter #0:11: start 5421.592000, end 5998.001000
    Metadata:
      title           : Chapter 12
    Chapter #0:12: start 5998.001000, end 6364.075000
    Metadata:
      title           : Chapter 13
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 720x360 [SAR 32:27 DAR 64:27], 519 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s (default)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : Stereo
    Stream #0:2(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : Surround
    Side data:
      audio service type: main
    Stream #0:3(eng): Data: bin_data (text / 0x74786574)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : SubtitleHandler
[ipod @ 0x7faff0014000] track 1: codec frame size is not set
Output #0, ipod, to 'Annabelle - Comes Home (2019)/Annabelle - Comes Home (2019).m4v':
  Metadata:
    major_brand     : mp42
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Chapter #0:0: start 0.000000, end 476.986000
    Metadata:
      title           : Chapter 1
    Chapter #0:1: start 476.986000, end 933.608000
    Metadata:
      title           : Chapter 2
    Chapter #0:2: start 933.608000, end 1441.449000
    Metadata:
      title           : Chapter 3
    Chapter #0:3: start 1441.449000, end 1976.358000
    Metadata:
      title           : Chapter 4
    Chapter #0:4: start 1976.358000, end 2579.753000
    Metadata:
      title           : Chapter 5
    Chapter #0:5: start 2579.753000, end 3149.030000
    Metadata:
      title           : Chapter 6
    Chapter #0:6: start 3149.030000, end 3726.941000
    Metadata:
      title           : Chapter 7
    Chapter #0:7: start 3726.941000, end 3973.520000
    Metadata:
      title           : Chapter 8
    Chapter #0:8: start 3973.520000, end 4504.676000
    Metadata:
      title           : Chapter 9
    Chapter #0:9: start 4504.676000, end 4904.409000
    Metadata:
      title           : Chapter 10
    Chapter #0:10: start 4904.409000, end 5421.592000
    Metadata:
      title           : Chapter 11
    Chapter #0:11: start 5421.592000, end 5998.001000
    Metadata:
      title           : Chapter 12
    Chapter #0:12: start 5998.001000, end 6364.075000
    Metadata:
      title           : Chapter 13
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 720x360 [SAR 32:27 DAR 64:27], q=2-31, 519 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : Surround
    Side data:
      audio service type: main
    Stream #0:2(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s
    Metadata:
      creation_time   : 2020-04-06T22:40:36.000000Z
      handler_name    : Stereo
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
  Stream #0:1 -> #0:2 (copy)
Press [q] to stop, [?] for help
frame=152602 fps=12872 q=-1.0 Lsize=  834270kB time=01:46:04.79 bitrate=1073.8kbits/s speed= 537x    
video:403702kB audio:424714kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.706676%


    


    Here is the resulting ffprobe of the new file showing it swapped the audio tracks :

    


    ffprobe version 4.2.1-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Annabelle - Comes Home (2019).m4v':
  Metadata:
    major_brand     : M4V 
    minor_version   : 512
    compatible_brands: isomiso2avc1
    encoder         : Lavf58.29.100
  Duration: 01:46:04.86, start: 0.000000, bitrate: 1073 kb/s
    Chapter #0:0: start 0.000000, end 476.986000
    Metadata:
      title           : Chapter 1
    Chapter #0:1: start 476.986000, end 933.608000
    Metadata:
      title           : Chapter 2
    Chapter #0:2: start 933.608000, end 1441.449000
    Metadata:
      title           : Chapter 3
    Chapter #0:3: start 1441.449000, end 1976.358000
    Metadata:
      title           : Chapter 4
    Chapter #0:4: start 1976.358000, end 2579.753000
    Metadata:
      title           : Chapter 5
    Chapter #0:5: start 2579.753000, end 3149.030000
    Metadata:
      title           : Chapter 6
    Chapter #0:6: start 3149.030000, end 3726.941000
    Metadata:
      title           : Chapter 7
    Chapter #0:7: start 3726.941000, end 3973.520000
    Metadata:
      title           : Chapter 8
    Chapter #0:8: start 3973.520000, end 4504.676000
    Metadata:
      title           : Chapter 9
    Chapter #0:9: start 4504.676000, end 4904.409000
    Metadata:
      title           : Chapter 10
    Chapter #0:10: start 4904.409000, end 5421.592000
    Metadata:
      title           : Chapter 11
    Chapter #0:11: start 5421.592000, end 5998.001000
    Metadata:
      title           : Chapter 12
    Chapter #0:12: start 5998.001000, end 6364.075000
    Metadata:
      title           : Chapter 13
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709), 720x360 [SAR 32:27 DAR 64:27], 519 kb/s, 23.98 fps, 23.98 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    Metadata:
      handler_name    : Surround
    Side data:
      audio service type: main
    Stream #0:2(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 162 kb/s
    Metadata:
      handler_name    : Stereo
    Stream #0:3(eng): Data: bin_data (text / 0x74786574)
    Metadata:
      handler_name    : SubtitleHandler
Unsupported codec with id 100359 for input stream 3


    


    What I don't understand is why is the file size different ? The resulting file is larger at 854,292,790 bytes. Shouldn't the file sizes be the same since I literally just swapped tracks 0 and 1 ?

    


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