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Sur d’autres sites (7370)

  • ffmpeg - less frames getting extracted than expected

    20 juin 2021, par Vrajesh Doshi
    


    ffmpeg -i instagram.mp4 -vf fps=29.97 thumb%06d.jpg -hide_banner

    
 


    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'instagram.mp4' : Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2avc1mp41
 encoder : Lavf55.19.104 Duration : 00:00:13.61, start : 0.000000, bitrate : 1163 kb/s
 Stream #0:0(und) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 1099 kb/s, 29.97 fps,
 29.97 tbr, 11988 tbn, 59.94 tbc (default)
 Metadata :
 handler_name : VideoHandler
 Stream #0:1(und) : Audio : aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 64 kb/s (default)
 Metadata :
 handler_name : SoundHandler Stream mapping : Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native)) Press [q] to stop, [?] for help [swscaler @ 0x55b2b53cf440] deprecated pixel format used, make sure
 you did set range correctly Output #0, image2, to 'thumb%06d.jpg' :
    
 Metadata :
 major_brand : isom
 minor_version : 512
 compatible_brands : isomiso2avc1mp41
 encoder : Lavf57.83.100
 Stream #0:0(und) : Video : mjpeg, yuvj420p(pc), 640x640 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc (default)
 Metadata :
 handler_name : VideoHandler
 encoder : Lavc57.107.100 mjpeg
 Side data :
 cpb : bitrate max/min/avg : 0/0/200000 buffer size : 0 vbv_delay : -1 frame= 405 fps=231 q=24.8 Lsize=N/A time=00:00:13.51 bitrate=N/A speed=7.72x video:5961kB audio:0kB subtitle:0kB other streams:0kB
 global headers:0kB muxing overhead : unknown

    


    



    The video duration is 13.61 seconds and frame rate is 29.97. So I was expecting 13.61 * 29.97 = 407.8917 i.e. 407 frames. But have got 405 frames. I am new to ffmpeg, need help to correctly get all 407 frames.

    



    I had also tried following command,

    



    ffmpeg -i instagram.mp4 thumb%06d.jpg -hide_banner


    



    but the output was same 405 frames.

    



    Possibly the start 2 frames are missing.

    



    I need to display the frames generated in the base video timeline. And on clicking on the frame I need to exactly seek the video to the frame position using HTML5 currentTime. Since the first 2 frames are not getting available, exact mapping is not getting possible.

    



    Please guide.

    


  • Why does Nvenc Encoder improve decoding speed ?

    22 juillet 2019, par Khoa Tran

    I am trying to improve the speed of decoding h264 video to mp4 video using Ffmpeg in c++. I have found a cli command that can do that but I still do not fully understand the command to reproduce it in c++ so I hope you guys can give me an explanation.

    The command that I found uses h264_nvenc encoder to improve the speed using GPU. However, I cannot understand why an h264 encoder would improve the speed of decoding h264 video (or maybe encoding to mp4 frame). Can anyone please give me a detailed explanation ?

    Here is the cli command that I found :

    ffmpeg -hwaccel cuvid -r 120 -i  -c:v h264_nvenc -preset fast -b:v 8M -vf scale=960:1080 -pix_fmt yuv420p  -y

    Thanks

    Edited :
    Log of command with option "-c:v h264_nvenc"

    C:\Users\Shared\GolfTec\test>ffmpeg.exe -hwaccel cuvid -r 120 -i C:\\Users\\Shared\\GolfTec\\test\\raw0.h264 -c:v h264_nvenc -preset medium -b:v 8M -vf scale=960:1080 -pix_fmt yuv420p C:\\Users\\Shared\\GolfTec\\test\\video0.mp4 -y
    
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 7.2.0 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray 
    
--enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy 
    
--enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 
    
--enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis 
    
--enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc 
    
--enable-dxva2 --enable-avisynth --enable-libmfx
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
[h264 @ 0000027ecb2a6700] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
Input #0, h264, from 'C:\\Users\\Shared\\GolfTec\\test\\raw0.h264':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: h264 (CAVLC 4:4:4), yuv444p(progressive), 960x1080, 25 fps, 25 tbr, 1200k tbn, 50 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_nvenc))
    
Press [q] to stop, [?] for help
    
Output #0, mp4, to 'C:\\Users\\Shared\\GolfTec\\test\\video0.mp4':
    
  Metadata:
    
    encoder         : Lavf57.83.100
    
    Stream #0:0: Video: h264 (h264_nvenc) (Main) (avc1 / 0x31637661), yuv420p, 960x1080, q=-1--1, 8000 kb/s, 120 fps, 15360 tbn, 120 tbc
    
    Metadata:
    
      encoder         : Lavc57.107.100 h264_nvenc
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/8000000 buffer size: 16000000 vbv_delay: -1
    
frame=  269 fps=261 q=25.0 Lsize=    2551kB time=00:00:02.23 bitrate=9356.5kbits/s speed=2.17x
    
video:2549kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.074325%

    Log of command without option "-c:v h264_nvenc"

    C:\Users\Shared\GolfTec\test>ffmpeg.exe -hwaccel cuvid -r 120 -i C:\\Users\\Shared\\GolfTec\\test\\raw0.h264 -preset medium -b:v 8M -vf scale=960:1080 -pix_fmt yuv420p C:\\Users\\Shared\\GolfTec\\test\\video0.mp4 -y
    
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
    
  built with gcc 7.2.0 (GCC)
    
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
[h264 @ 0000021e33556640] Stream #0: not enough frames to estimate rate; consider increasing probesize
    
Input #0, h264, from 'C:\\Users\\Shared\\GolfTec\\test\\raw0.h264':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: h264 (CAVLC 4:4:4), yuv444p(progressive), 960x1080, 25 fps, 25 tbr, 1200k tbn, 50 tbc
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
    
Press [q] to stop, [?] for help
    
[libx264 @ 0000021e335589a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
    
[libx264 @ 0000021e335589a0] profile High, level 4.2
    
[libx264 @ 0000021e335589a0] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=8000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
    
Output #0, mp4, to 'C:\\Users\\Shared\\GolfTec\\test\\video0.mp4':
    
  Metadata:
    
    encoder         : Lavf57.83.100
    
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 960x1080, q=-1--1, 8000 kb/s, 120 fps, 15360 tbn, 120 tbc
    
    Metadata:
    
      encoder         : Lavc57.107.100 libx264
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/8000000 buffer size: 0 vbv_delay: -1
    
frame=  269 fps= 39 q=-1.0 Lsize=    2279kB time=00:00:02.21 bitrate=8423.8kbits/s speed=0.32x
    
video:2277kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.119200%
    
[libx264 @ 0000021e335589a0] frame I:2     Avg QP:25.09  size: 16508
    
[libx264 @ 0000021e335589a0] frame P:193   Avg QP:23.94  size:  9094
    
[libx264 @ 0000021e335589a0] frame B:74    Avg QP:23.92  size:  7332
    
[libx264 @ 0000021e335589a0] consecutive B-frames: 62.8%  1.5%  0.0% 35.7%
    
[libx264 @ 0000021e335589a0] mb I  I16..4: 38.2% 54.3%  7.6%
    
[libx264 @ 0000021e335589a0] mb P  I16..4:  9.2% 11.8%  0.8%  P16..4: 46.5%  3.4%  3.8%  0.0%  0.0%    skip:24.5%
    
[libx264 @ 0000021e335589a0] mb B  I16..4:  4.3%  3.7%  0.2%  B16..8: 35.0%  1.5%  0.2%  direct: 9.5%  skip:45.5%  L0:56.6% L1:40.9% BI: 2.5%
    
[libx264 @ 0000021e335589a0] final ratefactor: 19.31
    
[libx264 @ 0000021e335589a0] 8x8 transform intra:53.1% inter:88.1%
    
[libx264 @ 0000021e335589a0] coded y,uvDC,uvAC intra: 22.0% 41.2% 4.5% inter: 12.8% 39.4% 0.0%
    
[libx264 @ 0000021e335589a0] i16 v,h,dc,p: 18% 32% 19% 31%
    
[libx264 @ 0000021e335589a0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 17% 54%  2%  3%  3%  4%  1%  2%
    
[libx264 @ 0000021e335589a0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11%  9% 63%  3%  4%  3%  3%  2%  2%
    
[libx264 @ 0000021e335589a0] i8c dc,h,v,p: 63% 23% 13%  1%
    
[libx264 @ 0000021e335589a0] Weighted P-Frames: Y:86.0% UV:64.8%
    
[libx264 @ 0000021e335589a0] ref P L0: 53.6%  8.3% 17.1% 11.4%  9.6%
    
[libx264 @ 0000021e335589a0] ref B L0: 58.9% 14.4% 26.6%
    
[libx264 @ 0000021e335589a0] ref B L1: 84.8% 15.2%
    
[libx264 @ 0000021e335589a0] kb/s:8317.64

  • Working Directory : null Environment : null

    23 avril 2020, par Mert

    I am trying to use ffmpeg.so on Android I am getting Working Directory : null Environment : null error.

    



    try {
    Process p = Runtime.getRuntime().exec("/data/data/com.example.foo/files/ffmpeg -f image2 -i "
+ Environment.getExternalStorageDirectory().getAbsolutePath() + "/img/b%d.jpg " 
+ Environment.getExternalStorageDirectory().getAbsolutePath() + "/DCIM/Camera/a444.mp4");   
} catch (IOException e) {
    e.printStackTrace();
}


    



    ERROR LOG

    



    04-09 01:50:45.683: I/Adreno-EGL(18393): : EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
04-09 01:50:45.713: D/OpenGLRenderer(18393): Enabling debug mode 0
04-09 01:53:56.487: D/dalvikvm(18551): Trying to load lib /data/app-lib/com.example.sodeneme-1/libffmpeg.so 0x423d7d00
04-09 01:53:56.487: D/dalvikvm(18551): Added shared lib /data/app-lib/com.example.sodeneme-1/libffmpeg.so 0x423d7d00
04-09 01:53:56.487: D/dalvikvm(18551): No JNI_OnLoad found in /data/app-lib/com.example.sodeneme-1/libffmpeg.so 0x423d7d00, skipping init
04-09 01:53:56.537: W/System.err(18551): java.io.IOException: Error running exec(). Command: [/data/data/com.example.sodeneme/files/ffmpeg, -f, image2, -i, /storage/emulated/0/img/b%d.jpg, /storage/emulated/0/DCIM/Camera/a444.mp4] Working Directory: null Environment: null
04-09 01:53:56.537: W/System.err(18551):    at java.lang.ProcessManager.exec(ProcessManager.java:211)
04-09 01:53:56.537: W/System.err(18551):    at java.lang.Runtime.exec(Runtime.java:173)
04-09 01:53:56.537: W/System.err(18551):    at java.lang.Runtime.exec(Runtime.java:246)
04-09 01:53:56.537: W/System.err(18551):    at java.lang.Runtime.exec(Runtime.java:189)
04-09 01:53:56.537: W/System.err(18551):    at com.example.sodeneme.MainActivity.onCreate(MainActivity.java:40)
04-09 01:53:56.537: W/System.err(18551):    at android.app.Activity.performCreate(Activity.java:5231)
04-09 01:53:56.537: W/System.err(18551):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-09 01:53:56.537: W/System.err(18551):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-09 01:53:56.537: W/System.err(18551):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-09 01:53:56.537: W/System.err(18551):    at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-09 01:53:56.537: W/System.err(18551):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-09 01:53:56.537: W/System.err(18551):    at android.os.Handler.dispatchMessage(Handler.java:102)
04-09 01:53:56.537: W/System.err(18551):    at android.os.Looper.loop(Looper.java:136)
04-09 01:53:56.537: W/System.err(18551):    at android.app.ActivityThread.main(ActivityThread.java:5017)
04-09 01:53:56.537: W/System.err(18551):    at java.lang.reflect.Method.invokeNative(Native Method)
04-09 01:53:56.537: W/System.err(18551):    at java.lang.reflect.Method.invoke(Method.java:515)
04-09 01:53:56.537: W/System.err(18551):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-09 01:53:56.537: W/System.err(18551):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-09 01:53:56.537: W/System.err(18551):    at dalvik.system.NativeStart.main(Native Method)
04-09 01:53:56.547: W/System.err(18551): Caused by: java.io.IOException: No such file or directory
04-09 01:53:56.547: W/System.err(18551):    at java.lang.ProcessManager.exec(Native Method)
04-09 01:53:56.547: W/System.err(18551):    at java.lang.ProcessManager.exec(ProcessManager.java:209)
04-09 01:53:56.547: W/System.err(18551):    ... 18 more
04-09 01:53:56.577: I/Adreno-EGL(18551): : EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
04-09 01:53:56.607: D/OpenGLRenderer(18551): Enabling debug mode 0


    



    PERMISSIONS

    



    






    


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