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• FFmpeg : concat protocol gives corrupt output and skips few frames

  11 décembre 2018, par Prashant_Sarin

  Using :

  var command = "-y -i concat:$concatString -c copy -bsf:a aac_adtstoasc $outputFile"

  output video skips few frames in between and jumps from 4th second to 6th sec

  If i use :

  var command = "-y -i concat:$concatString -c:v libx264 -preset ultrafast -crf 30 $outputFile"

  Then, the output is fine but it is taking too much time with the warning of

  [mp4 @ 0xf7228600] Non-monotonous DTS in output stream 0:1

  The logs are as :

  2018-12-11 13:27:19.146 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 705608, current: 210096; changing to 705609. This may result in incorrect timestamps in the output file.
  
  2018-12-11 13:27:19.146 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- frame=  745 fps=0.0 q=-1.0 Lsize=    1823kB    time=00:03:04.84 bitrate=  80.8kbits/s speed= 758x    
  
  2018-12-11 13:27:19.147 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: onProgress ----Merge---- video:1781kB audio:32kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.563412%
  
  2018-12-11 13:27:19.148 7435-7435/com.onedayapp.mystory.dev D/com.onedayapp.mystory.oneday.controllers.service.VideoCompositionService: Merged successfully message---------ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (GCC)  configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xf4524600] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from '/storage/emulated/0/OneDay/Member/128/Video/Story/94071beb-0b5f-4588-b388-ff78d24c07a8/concatVideo.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 695 kb/s
  
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 693 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp4, to '/storage/emulated/0/OneDay/Member/128/Video/Story/94071beb-0b5f-4588-b388-ff78d24c07a8/Final.mp4':
  
    Metadata:
  
      encoder         : Lavf57.25.100
  
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 693 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, 2 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0xf4524600] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132096, current: 24152; changing to 132097. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132097, current: 25176; changing to 132098. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132098, current: 26200; changing to 132099. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132099, current: 27224; changing to 132100. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132100, current: 28248; changing to 132101. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 0xf4524c00] Non-monotonous DTS in output stream 0:1; previous: 132101, current: 29272; changing to 132102. This may result in incorrect timestamps in the output file.

  Last few lines are onSuccess() message of when i run with concat Demuxer.
  All files are *.mp4 files.

• Flask send_file not sending file

  30 avril 2021, par jackmerrill

  I'm using Flask with send_file() to have people download a file off the server.

  



  My current code is as follows :

  



  @app.route('/', methods=["GET", "POST"])
def index():
    if request.method == "POST":
        link = request.form.get('Link')
        with youtube_dl.YoutubeDL(ydl_opts) as ydl:
            info_dict = ydl.extract_info(link, download=False)
            video_url = info_dict.get("url", None)
            video_id = info_dict.get("id", None)
            video_title = info_dict.get('title', None)
            ydl.download([link])
        print("sending file...")
        send_file("dl/"+video_title+".f137.mp4", as_attachment=True)
        print("file sent, deleting...")
        os.remove("dl/"+video_title+".f137.mp4")
        print("done.")
        return render_template("index.html", message="Success!")
    else:
        return render_template("index.html", message=message)


  



  The only reason I have .f137.mp4 added is because I am using AWS C9 to be my online IDE and I can't install FFMPEG to combine the audio and video on Amazon Linux. However, that is not the issue. The issue is that it is not sending the download request.

  



  Here is the console output :

  



  127.0.0.1 - - [12/Dec/2018 16:17:41] "POST / HTTP/1.1" 200 -
[youtube] 2AYgi2wsdkE: Downloading webpage
[youtube] 2AYgi2wsdkE: Downloading video info webpage
[youtube] 2AYgi2wsdkE: Downloading webpage
[youtube] 2AYgi2wsdkE: Downloading video info webpage
WARNING: You have requested multiple formats but ffmpeg or avconv are not installed. The formats won't be merged.
[download] Destination: dl/Meme Awards v244.f137.mp4
[download] 100% of 73.82MiB in 00:02
[download] Destination: dl/Meme Awards v244.f140.m4a
[download] 100% of 11.63MiB in 00:00
sending file...
file sent, deleting...
done.
127.0.0.1 - - [12/Dec/2018 16:18:03] "POST / HTTP/1.1" 200 -


  



  Any and all help is appreciated. Thanks !

  


• Failed setup for format dxva2_vld : hwaccel initialisation returned error

  13 juin 2023, par james

  My program is a video player based on ffmpeg implementation, enabling d3d11va and dxva2 hardware acceleration to decode video frames, play most of the video is normal, only a small part of the video will report this error, ffmpeg printed log as follows :
I:2023-06-13 15:34:53 ms:887:No decoder device for codec found
I:2023-06-13 15:34:53 ms:887:Failed setup for format dxva2_vld : hwaccel initialisation returned error.
I:2023-06-13 15:34:53 ms:888:Format dxva2_vld not usable, retrying get_format() without it.
I:2023-06-13 15:34:53 ms:888:decode_slice_header error
I:2023-06-13 15:34:53 ms:888:no frame !

  


  If ffplay is used and d3d11va and dxva2 hardware acceleration is not enabled, the video can be played normally, and the printed video information is as follows :
PS D :\msys64\home\wangj\ffmpeg-4.4.1\buildout\bin> .\ffplay.exe -i D :\Desktop\13132023061300012_1_C1_34.mp4
ffplay version 4.4.1 Copyright (c) 2003-2021 the FFmpeg developers
configuration : —prefix=./buildout —arch=x86 —toolchain=msvc —enable-shared —disable-debug —enable-sdl2 —enable-dxva2 —enable-d3d11va
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D :\Desktop\13132023061300012_1_C1_34.mp4' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf56.38.102
Duration : 00:00:44.00, start : 0.000000, bitrate : 1706 kb/s
Stream #0:0(und) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 1705 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
Metadata :
handler_name : VideoHandler
vendor_id : [0][0][0][0]

  


  Is this pixel format not supported by d3d11va and dxva2 ? What can I do to get ffplay to play this video file with hardware acceleration ?

  


  When d3d11va and dxva2 hardware acceleration is enabled, most of the videos that can be played also have yuv420p pixel format, why can't this video be played？