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• ffmpeg via pipe : stream 1, offset 0x30 : partial file

  5 octobre 2024, par Dito Adriel

  my videodata is dynamic it can use any exension but its error when i use mp4 extension.

  


  my function :

  


  func (s *service) convertVideo(videoData []byte) ([]byte, error) {
    var buffer bytes.Buffer
    cmd := exec.Command("ffmpeg",
        "-i", "pipe:0",
        "-c:v", "libvpx-vp9",
        "-b:v", "0",
        "-f", "webm",
        "-t", "8",
        "-preset", "ultrafast",
        "pipe:1")
    cmd.Stdin = bytes.NewReader(videoData)
    cmd.Stdout = &buffer
    err := cmd.Run()
    if err != nil {
        return nil, err
    }
    return buffer.Bytes(), nil
}


  


  and got error :

  


  stream 1, offset 0x30: partial file
Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 720x1280, 773 kb/s): unspecified pixel format


  


  is it because i use stream pipe ? becuase if i use temp file its success, but its not that effective.

  


  New

  


  if i convert my mp4 to mp4 first, then it success. so the cause of problem is from my mp4, but still not found the solution in code.

  


• How can i forcing current frame to be encoded as intra frame using libavcodec

  14 avril 2021, par pensir

  I want to change gop dynamic to adapt to player. Smaller gop help for reduce first screen cost ; Big gop help to reduce bitrate to save bandwidth.

  


  I found nvenc has a function which can solve the problem above.
https://docs.nvidia.com/video-technologies/video-codec-sdk/nvenc-video-encoder-api-prog-guide/#forcing-current-frame-to-be-encoded-as-intra-frame

  


  But I'm using ffmpeg. Is there any similar function in ffmpeg ?

  


• Android FFmpeg build : cannot find -lavutil

  4 novembre 2016, par Jon G

  I am trying to build FFmpeg for Android JNI using the guide here (forked from appunite’s build). One difference between my build and theirs is that I am trying to use the FFmpeg master branch instead of commit 82db8ee, maybe that is relevant. I am coming across a build issue when I try to build for multiple architectures in a row.

  The code that is running is :

  ${LD} -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib -soname $SONAME -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o $OUT_LIBRARY -lavformat -lavcodec -lx264 -lavfilter -lavutil -lswscale -lswresample -lavresample -lfribidi -lvo-aacenc -lvo-amrwbenc -lpostproc -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker -zmuldefs $PREBUILT/lib/gcc/$EABIARCH/$COMPILATOR_VERSION.x/libgcc.a

  The logs that are outputted in the MIPS case are :

  ...
  
  FINISHED ffmpeg for mips
  
  + build_one
  
  + echo 'Starting build one for mips'
  
  Starting build one for mips
  
  + cd ffmpeg
  
  + /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-ld -rpath-link=/home/jon/Development/android-ndk-r10e/platforms/android-9/arch-mips//usr/lib -L/home/jon/Development/android-ndk-r10e/platforms/android-9/arch-mips//usr/lib -L/home/jon/workspace/kyawkyaw-AndroidFFmpeg/library-jni/jni/ffmpeg-build/mips/lib -soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no-undefined -o /home/jon/workspace/kyawkyaw-AndroidFFmpeg/library-jni/jni/ffmpeg-build/mips/libffmpeg.so -lavcodec -lavformat -lavresample -lavutil -lfdk-aac -lswresample -lx264 -lswscale -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker -zmuldefs /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/lib/gcc/mipsel-linux-android/4.9/libgcc.a
  
  /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-ld: skipping incompatible /home/jon/workspace/kyawkyaw-AndroidFFmpeg/library-jni/jni/ffmpeg-build/mips/lib/libavutil.a when searching for -lavutil
  
  /home/jon/Development/android-ndk-r10e/toolchains/mipsel-linux-android-4.9/prebuilt/linux-x86_64/bin/mipsel-linux-android-ld: cannot find -lavutil

  Everything seems successful until that point. Why would libavutil.a be incompatible ?

  I find that if I revert FFmpeg to commit 82db8ee, build for MIPS (successful), change back to master, then build for MIPS again, it does not raise the error. Perhaps something is not being cleaned up properly ?