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• How rust links ffmpeg static library ?

  11 juillet 2022, par Jeycri

  I'm using rust to link ffmpeg and compile wasm, but I encounter a compilation problem, and the error is as follows.Because the error is too long, I only intercept the key part.

  


  note: /usr/bin/ld: /usr/local/ffmpeg4.3.3/lib/libavfilter.a: error adding symbols: file format not recognized
collect2: error: ld returned 1 exit status


  


  The problem lies in the link mode of ffmpeg library, because I use static library, but I don't know how to set it to compile for static library.This is my .toml

  


  [package]
name = "r_linkc"
version = "0.1.0"
edition = "2021"
[dependencies]
libc = "0.2"
ffmpeg-sys = { version = "4.3.1", features = ["default", "static"] }
[target.'cfg(target_os="linux")']
rustflags=["-C", "link-args=-static"]


  


  This is a screenshot of my library.


  


  What is the right way to link ffmpeg static libraries ?

  


• PowerShell and ffmpeg : No such file or directory

  8 juillet 2022, par Matt Wilson

  I'm trying to use the below command in a Python script, however I'm seeing that it's a PowerShell issue in that it can't seem to find the video file I'm pointing to.

  


  I have a video file on a cloud drive Z: at the following location (for reproducibility, change this to whatever path you want with a video file in it) :

  


  Z:\Udemy_And_Misc_Downloads\TensorFlow Developer Certificate in 2021 Zero to Mastery\3. Neural network regression with TensorFlow\18. Setting up TensorFlow modelling experiments part 2 (increasing complexity).mp4

  


  Notice the spaces and special characters in the filename in case that matters.

  


  What I'm trying to do is down-sample that video file to a smaller size with the following command :

  


  ffmpeg -i "Z:\Udemy_And_Misc_Downloads\TensorFlow Developer Certificate in 2021 Zero to Mastery\[TutsNode.com] - TensorFlow Developer Certificate in 2021 Zero to Mastery\3. Neural network regression with TensorFlow\18. Setting up TensorFlow modelling experiments part 2 (increasing complexity).mp4" -y -vcodec libx264 -acodec ac3 -threads 1 "Z:\Udemy_And_Misc_Downloads\TensorFlow Developer Certificate in 2021 Zero to Mastery\[TutsNode.com] - TensorFlow Developer Certificate in 2021 Zero to Mastery\3. Neural network regression with TensorFlow\18. Setting up TensorFlow modelling experiments part 2 (increasing complexity)DOWNSAMPLED.mp4"

  


  I know it's long as it's mostly consumed by the filenames, but the error I'm getting is :

  


  Z:\Udemy_And_Misc_Downloads\TensorFlow Developer Certificate in 2021 Zero to Mastery\[TutsNode.com] - TensorFlow  Developer Certificate in 2021 Zero to Mastery\3. Neural network regression with TensorFlow\18. Setting up TensorFlow  modelling experiments part 2 (increasing complexity).mp4: No such file or directory

  


  The path IS correct, as it's a direct copy paste from the folder's URL bar.

  


  The things I've tried include :

  


  

  • using quotes around filename

  


  • not using quotes around filename

  


  • prepending quoted filename with "r" (where I got message saying `did you mean file:r ?)

  


  • prepending quoted filename with "file:r"

  


  • used double slashes \ in filepaths

  


  


  Is there a powershell pro out there that can tell me why it can't "find" the file ?

  


  UPDATE
The command runs if I find a filename with :

  


  $oldvids = Get-ChildItem *.mp4, *mov, *wmv, *avi -Recurse
foreach ($oldvid in $oldvids) 
{
    $newvid = [io.path]::ChangeExtension($oldvid.FullName, '_.mp4')
    ffmpeg -i $oldvid.FullName -y -vcodec libx264 -acodec ac3 -threads 1 $newvid
}


  


  When I print the $oldvid.name and $oldvid.FullName, the paths/filenames look like this :

  


  Z:\Udemy_And_Misc_Downloads\TensorFlow Developer Certificate in 2021 Zero to Mastery\5. Computer Vision and Convolutional Neu
ral Networks in TensorFlow\35. Multi-class CNN's part 9 Making predictions with our model on custom images.mp4

35. Multi-class CNN's part 9 Making predictions with our model on custom images.mp4


  


  ...that first one being an exact copy of what I'm trying to use in my posted code. So what's the difference ??

  


  SECOND UPDATE
I think the issue lies in that the file is located on a drive other than C:. Just tested it by moving the file onto my computer and running the command, and it worked. So I guess, is there a way to tell PowerShell to use the Z: drive to find the file ?

  


• FFmpeg converting to .265 corrupts videos

  25 juin 2022, par Alfa

  I'm trying to convert and compress videos in React Native using FFmpegKit, what is strange is it is very slow regardless of the preset I use, Also, no matter how big the input video is, it always produces a video less than 1MB that is corrupt.
This is my first time using FFmpeg, I'm using it due to the lack of good video compressing libraries on React Native.

  


  My command looks like this :

  


  const getFFmpegCommand = (input: string, output: string) => {
  const scale = `"scale='if(gte(iw,ih),min(720,iw),-2):if(lt(iw,ih),min(720,ih),-2)'"`;
  const preset = '-preset veryfast ';
  const ffmpegCommand = `-i ${input} -y -crf 28 -vf ${scale} ${preset} -c:v libx265 ${output}`;
  return ffmpegCommand;
};


  


  This is my log output

  


      ffmpeg version v4.5-dev-3393-g30322ebe3c
    LOG   Copyright (c) 2000-2021 the FFmpeg developers
    LOG  
    LOG    built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
    LOG    configuration: --cross-prefix=i686-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/storage/light/projects/ffmpeg-kit/prebuilt/android-x86/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=i686 --cpu=i686 --target-os=android --disable-neon --disable-asm --disable-inline-asm --ar=i686-linux-android-ar --cc=i686-linux-android24-clang --cxx=i686-linux-android24-clang++ --ranlib=i686-linux-android-ranlib --strip=i686-linux-android-strip --nm=i686-linux-android-nm --extra-libs='-L/storage/light/projects/ffmpeg-kit/prebuilt/android-x86/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libx264 --enable-libxvid --enable-libx265 --enable-libvidstab --disable-sdl2 --disable-openssl --enable-zlib --enable-mediacodec --enable-gpl
    LOG    libavutil      57. 13.100 / 57. 13.100
    LOG    libavcodec     59. 15.102 / 59. 15.102
    LOG    libavformat    59. 10.100 / 59. 10.100
    LOG    libavdevice    59.  1.100 / 59.  1.100
    LOG    libavfilter     8. 21.100 /  8. 21.100
    LOG    libswscale      6.  1.102 /  6.  1.102
    LOG    libswresample   4.  0.100 /  4.  0.100
    LOG  Guessed Channel Layout for Input Stream #0.1 : mono
    LOG  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file:///data/user/0/com.orbis.cybersight/files/95fdb965-5074-421f-b6b0-9e67332550ca/VID_20220625_211041.mp4':
    LOG    Metadata:
    LOG      major_brand     :
    LOG  mp42
    LOG  
    LOG      minor_version   :
    LOG  0
    LOG  
    LOG      compatible_brands:
    LOG  isommp42
    LOG  
    LOG      creation_time   :
    LOG  2022-06-25T19:11:17.000000Z
    LOG  
    LOG      location        :
    LOG  +37.4234-122.0839/
    LOG  
    LOG      location-eng    :
    LOG  +37.4234-122.0839/
    LOG  
    LOG      com.android.version:
    LOG  11
    LOG  
    LOG    Duration:
    LOG  00:00:33.68
    LOG  , start:
    LOG  0.000000
    LOG  , bitrate:
    LOG  8302 kb/s
    LOG  
    LOG    Stream #0:0
    LOG  [0x1]
    LOG  (eng)
    LOG  : Video: h264 (avc1 / 0x31637661), yuv420p(tv, gbr/reserved/reserved, progressive), 1280x720, 9007 kb/s
    LOG  , SAR 1:1 DAR 16:9
    LOG  ,
    LOG  22.69 fps,
    LOG  90k tbr,
    LOG  90k tbn
    LOG   (default)
    LOG  
    LOG      Metadata:
    LOG        creation_time   :
    LOG  2022-06-25T19:11:17.000000Z
    LOG  
    LOG        handler_name    :
    LOG  VideoHandle
    LOG  
    LOG        vendor_id       :
    LOG  [0][0][0][0]
    LOG  
    LOG      Side data:
    LOG  
    LOG  displaymatrix: rotation of -90.00 degrees
    LOG  
    LOG    Stream #0:1
    LOG  [0x2]
    LOG  (eng)
    LOG  : Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, fltp, 12 kb/s
    LOG   (default)
    LOG  
    LOG      Metadata:
    LOG        creation_time   :
    LOG  2022-06-25T19:11:17.000000Z
    LOG  
    LOG        handler_name    :
    LOG  SoundHandle
    LOG  
    LOG        vendor_id       :
    LOG  [0][0][0][0]
    LOG  
    LOG  [h264 @ 0xebd4c280] The "sub_text_format" option is deprecated: Deprecated, does nothing
    LOG  [amrnb @ 0xebd4dc00] The "sub_text_format" option is deprecated: Deprecated, does nothing
    LOG  Stream mapping:
    LOG    Stream #0:0 -> #0:0
    LOG   (h264 (native) -> hevc (libx265))
    LOG  
    LOG    Stream #0:1 -> #0:1
    LOG   (amr_nb (amrnb) -> aac (native))
    LOG  
    LOG  Press [q] to stop, [?] for help
    LOG  [aac @ 0xebd4a5d0] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
    LOG  Output #0, mp4, to '/storage/emulated/0/Android/data/com.orbis.cybersight/files/3dfb9ef6-6cb3-4adf-9777-8fb4c7762dc7.mp4':
    LOG    Metadata:
    LOG      major_brand     :
    LOG  mp42
    LOG  
    LOG      minor_version   :
    LOG  0
    LOG  
    LOG      compatible_brands:
    LOG  isommp42
    LOG  
    LOG      com.android.version:
    LOG  11
    LOG  
    LOG      location        :
    LOG  +37.4234-122.0839/
    LOG  
    LOG      location-eng    :
    LOG  +37.4234-122.0839/
    LOG  
    LOG      encoder         :
    LOG  Lavf59.10.100
    LOG  
    LOG    Stream #0:0
    LOG  (eng)
    LOG  : Video: hevc (hev1 / 0x31766568), yuv420p(tv, gbr/reserved/reserved, progressive), 720x1280 [SAR 1:1 DAR 9:16], q=2-31
    LOG  ,
    LOG  22.69 fps,
    LOG  2502k tbn
    LOG   (default)
    LOG  
    LOG      Metadata:
    LOG        creation_time   :
    LOG  2022-06-25T19:11:17.000000Z
    LOG  
    LOG        handler_name    :
    LOG  VideoHandle
    LOG  
    LOG        vendor_id       :
    LOG  [0][0][0][0]
    LOG  
    LOG        encoder         :
    LOG  Lavc59.15.102 libx265
    LOG  
    LOG      Side data:
    LOG  
    LOG  cpb:
    LOG  bitrate max/min/avg: 0/0/0 buffer size: 0
    LOG  vbv_delay: N/A
    LOG  
    LOG  
    LOG  displaymatrix: rotation of -0.00 degrees
    LOG  
    LOG    Stream #0:1
    LOG  (eng)
    LOG  : Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s
    LOG   (default)
    LOG  
    LOG      Metadata:
    LOG        creation_time   :
    LOG  2022-06-25T19:11:17.000000Z
    LOG  
    LOG        handler_name    :
    LOG  SoundHandle
    LOG  
    LOG        vendor_id       :
    LOG  [0][0][0][0]
    LOG  
    LOG        encoder         :
    LOG  Lavc59.15.102 aac