Sur d’autres sites (4746)

• How to record desktop while on x2go session via a command line tool ?

  4 décembre 2017, par haragei

  the Goal :
  I am trying to record a specific X display on a remote server with a command line tool.

  the Problem :
  The output file contains a pure black video stream for the whole duration of the recording.

  My Approach :
  I am connecting to a remote server via x2go. The Server runs Ubuntu 16.04.2 with Xfce Desktop Environment. The Display I try to record is :50 (which gets created when I connect to the x2go server). I can control the remote server totally fine through x2go.

  My commands for recording via ffmpeg (or avconv/recordmydesktop, which use ffmpeg underneath) all look more or less the same and are like this :
  ffmpeg -f x11grab -r 25 -s 1854x1176 -i :50.0 -c:v libx264 screencast.mkv

  Sample output :

  user@machine:~/$ ffmpeg -f x11grab -r 25 -s 1854x1176 -i :50.0+0,0 -c:v libx264 -vb 4000k -an screencast.mkv
  
  ffmpeg version N-86766-g264f6c6 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/home/user/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/user/ffmpeg_build/include --extra-ldflags=-L/home/user/ffmpeg_build/lib --bindir=/home/user/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  
    libavutil      55. 67.100 / 55. 67.100
  
    libavcodec     57.100.104 / 57.100.104
  
    libavformat    57. 75.100 / 57. 75.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 95.100 /  6. 95.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [x11grab @ 0x1fd9b40] XFixes not available, cannot draw the mouse.
  
  [x11grab @ 0x1fd9b40] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, x11grab, from ':50.0+0,0':
  
    Duration: N/A, start: 1500041497.684675, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1854x1176, 25 fps, 1000k tbr, 1000k tbn, 1000k tbc
  
  File 'screencast.mkv' already exists. Overwrite ? [y/N] y
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x1fe3040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x1fe3040] profile High 4:4:4 Predictive, level 4.2, 4:4:4 8-bit
  
  [libx264 @ 0x1fe3040] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=4 threads=12 lookahead_threads=2 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=4000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, matroska, to 'screencast.mkv':
  
    Metadata:
  
      encoder         : Lavf57.75.100
  
      Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuv444p, 1854x1176, q=-1--1, 4000 kb/s, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.100.104 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/4000000 buffer size: 0 vbv_delay: -1
  
  [swscaler @ 0x1fe94e0] Warning: data is not aligned! This can lead to a speedloss
  
  frame=  179 fps= 36 q=-1.0 Lsize=      16kB time=00:00:07.04 bitrate=  18.8kbits/s speed=1.43x    
  
  video:14kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 12.869934%
  
  [libx264 @ 0x1fe3040] frame I:1     Avg QP: 6.00  size:   518
  
  [libx264 @ 0x1fe3040] frame P:45    Avg QP: 0.44  size:    81
  
  [libx264 @ 0x1fe3040] frame B:133   Avg QP: 0.94  size:    73
  
  [libx264 @ 0x1fe3040] consecutive B-frames:  0.6%  1.1%  0.0% 98.3%
  
  [libx264 @ 0x1fe3040] mb I  I16..4:  0.0% 100.0%  0.0%
  
  [libx264 @ 0x1fe3040] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
  
  [libx264 @ 0x1fe3040] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%
  
  [libx264 @ 0x1fe3040] final ratefactor: -23.85
  
  [libx264 @ 0x1fe3040] 8x8 transform intra:100.0%
  
  [libx264 @ 0x1fe3040] coded y,u,v intra: 0.0% 0.0% 0.0% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x1fe3040] i16 v,h,dc,p:  0%  0% 100%  0%
  
  [libx264 @ 0x1fe3040] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  0%  0% 100%  0%  0%  0%  0%  0%  0%
  
  [libx264 @ 0x1fe3040] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x1fe3040] kb/s:15.56

  Using : Ubuntu 16.04.2 LTS

  I have successfully accomplished to capture the display :50 with "simplescreenrecorder", but that tool has no command line interface. It uses ffmpeg also, so it somehow should be possible to caputure the display but I can´t get it to work properly.

• ffmpeg throw a silent video output when trying to merge video and audio

  31 janvier 2023, par porororo

  I tried to combine mp4 format video and wav format audio.
The video is shorter than the audio and start second is same as 00:00.

  


  I used command as bellows :

  


  ffmpeg -i video.mp4 -i audio.wav  -filter_complex "[0:a]volume=0.2[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y -shortest output_video.mp4


  


  The problem is the output_video.mp4 is a silent video without the sound.

  


  How can I get the output_video.mp4 with sound from audio.wav ?

  


  ffmpeg output is :

  


  

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
configuration: --prefix=/tmp/build/80754af9/ffmpeg_1587154242452/\_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placeho --cc=/tmp/build/80754af9/ffmpeg_1587154242452/\_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-avresample --enable-gmp --enable-hardcoded-tables --enable-libfreetype --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame --disable-nonfree --enable-gpl --enable-gnutls --disable-openssl --enable-libopenh264 --enable-libx264
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
libavresample   4.  0.  0 /  4.  0.  0
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 'video.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf58.29.100
Duration: 00:00:19.04, start: 0.000000, bitrate: 510 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 373 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
Metadata:
handler_name    : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
handler_name    : SoundHandler
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'audio.wav':
Duration: 00:00:14.70, bitrate: 352 kb/s
Stream #1:0: Audio: pcm_s16le (\[1\]\[0\]\[0\]\[0\] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
Stream mapping:
Stream #0:1 (aac) -\> volume (graph 0)
Stream #1:0 (pcm_s16le) -\> amerge:in0 (graph 0)
Stream #0:0 -\> #0:0 (h264 (native) -\> h264 (libx264))
amerge (graph 0) -\> Stream #0:1 (aac)
Press \[q\] to stop, \[?\] for help
\[libx264 @ 0x55aa9a642ac0\] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
\[libx264 @ 0x55aa9a642ac0\] profile High, level 3.1, 4:2:0, 8-bit
\[libx264 @ 0x55aa9a642ac0\] 264 - core 157 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=22 lookahead_threads=3 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=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
\[Parsed_amerge_1 @ 0x55aa9b37c140\] No channel layout for input 1
Output #0, mp4, to 'output_video.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf58.29.100
Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 1280x720, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)
Metadata:
handler_name    : VideoHandler
encoder         : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 22050 Hz, 3.0, fltp, 197 kb/s (default)
Metadata:
encoder         : Lavc58.54.100 aac
frame=  507 fps=291 q=-1.0 Lsize=    1116kB time=00:00:16.80 bitrate= 544.3kbits/s speed=9.64x  
video:760kB audio:342kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.242977%
\[libx264 @ 0x55aa9a642ac0\] frame I:3     Avg QP:16.24  size: 19770
\[libx264 @ 0x55aa9a642ac0\] frame P:154   Avg QP:20.29  size:  3227
\[libx264 @ 0x55aa9a642ac0\] frame B:350   Avg QP:19.84  size:   633
\[libx264 @ 0x55aa9a642ac0\] consecutive B-frames:  0.6% 15.8% 18.9% 64.7%
\[libx264 @ 0x55aa9a642ac0\] mb I  I16..4: 23.5% 67.4%  9.1%
\[libx264 @ 0x55aa9a642ac0\] mb P  I16..4:  0.7%  3.0%  0.3%  P16..4: 13.0%  3.1%  1.0%  0.0%  0.0%    skip:78.8%
\[libx264 @ 0x55aa9a642ac0\] mb B  I16..4:  0.2%  0.1%  0.0%  B16..8: 10.4%  0.3%  0.0%  direct: 0.6%  skip:88.3%  L0:41.5% L1:57.2% BI: 1.3%
\[libx264 @ 0x55aa9a642ac0\] 8x8 transform intra:68.2% inter:81.9%
\[libx264 @ 0x55aa9a642ac0\] coded y,uvDC,uvAC intra: 24.6% 22.9% 6.1% inter: 1.2% 1.7% 0.0%
\[libx264 @ 0x55aa9a642ac0\] i16 v,h,dc,p: 68% 16%  6% 10%
\[libx264 @ 0x55aa9a642ac0\] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 10% 50%  2%  2%  3%  2%  4%  3%
\[libx264 @ 0x55aa9a642ac0\] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 25% 13%  5%  5%  6%  5%  6%  4%
\[libx264 @ 0x55aa9a642ac0\] i8c dc,h,v,p: 75% 10% 12%  2%
\[libx264 @ 0x55aa9a642ac0\] Weighted P-Frames: Y:0.0% UV:0.0%
\[libx264 @ 0x55aa9a642ac0\] ref P L0: 65.9% 16.2% 13.5%  4.4%
\[libx264 @ 0x55aa9a642ac0\] ref B L0: 84.1% 13.4%  2.5%
\[libx264 @ 0x55aa9a642ac0\] ref B L1: 97.1%  2.9%
\[libx264 @ 0x55aa9a642ac0\] kb/s:368.24
\[aac @ 0x55aa9a62a280\] Qavg: 8290.713


  


  


  


• Create 1 video using image with length of audio

  19 septembre 2017, par Vishnu

  I am trying to create video with the length of an audio file , and 1 single image as the background for whole video.

  I use following code

  'ffmpeg -y -loop 1 -f image2 -r 24 -i subtitle.jpg  -i audio.mp3 -c:v libx264 -c:a copy -shortest video.flv';

  But problem is processing time is too slow , and sometime video length is not same as audio length.Can some one suggest me alternative ideas.

  p.s : audio length is just 3 to 8 seconds.

  Below is my output

  ffmpeg version N-83443-gc03029a Copyright (c) 2000-2017 the FFmpeg
  developers built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)
  configuration : —enable-gpl —enable-version3 —enable-libfdk_aac
  —enable-libmp3lame —enable-libtheora —enable-libvorbis —enable-libvpx —enable-libx264 —enable-nonfree —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libgsm —enable-libxvid —disable-static —enable-shared libavutil 55. 46.100 / 55. 46.100 libavcodec 57. 75.100 / 57. 75.100 libavformat 57. 66.101
  / 57. 66.101 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 73.100 /
  6. 73.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 / 2. 4.100 libpostproc 54. 2.100 / 54. 2.100 Input #0, image2, from ’subtitle/1.jpg’ : Duration : 00:00:00.04, start : 0.000000, bitrate : N/A
  Stream #0:0 : Video : mjpeg, yuvj420p(pc, bt470bg/unknown/unknown),
  1280x720 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 24 tbn, 24 tbc [mp3 @
  0x1013ee0] Estimating duration from bitrate, this may be inaccurate
  Input #1, mp3, from ’audio/1.mp3’ : Metadata : encoder : Lavf57.71.100
  Duration : 00:00:05.98, start : 0.000000, bitrate : 32 kb/s Stream #1:0 :
  Audio : mp3, 22050 Hz, mono, s16p, 32 kb/s No pixel format specified,
  yuvj420p for H.264 encoding chosen. Use -pix_fmt yuv420p for
  compatibility with outdated media players. [libx264 @ 0x1020600] using
  SAR=1/1 [libx264 @ 0x1020600] using cpu capabilities : MMX2 SSE2Fast
  SSSE3 SSE4.2 AVX [libx264 @ 0x1020600] profile High, level 3.1
  [libx264 @ 0x1020600] 264 - core 148 r2762 90a61ec - 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=3 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=24 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
  mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
  aq=1:1.00 Output #0, flv, to ’video/1.flv’ : Metadata : encoder :
  Lavf57.66.101 Stream #0:0 : Video : h264 (libx264) ([7][0][0][0] /
  0x0007), yuvj420p(pc), 1280x720 [SAR 1:1 DAR 16:9], q=-1—1, 24 fps,
  1k tbn, 24 tbc Metadata : encoder : Lavc57.75.100 libx264 Side data :
  cpb : bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : -1 Stream

  0:1 : Audio : mp3 ([2][0][0][0] / 0x0002), 22050 Hz, mono, s16p, 32 kb/s Stream mapping : Stream #0:0 -> #0:0 (mjpeg (native) -> h264

  (libx264)) Stream #1:0 -> #0:1 (copy) Press [q] to stop, [?] for help
  [image2 @ 0x1011680] Thread message queue blocking ; consider raising
  the thread_queue_size option (current value : 8) frame= 32 fps=0.0
  q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A speed= 0x frame= 53 fps=
  51 q=28.0 size= 210kB time=00:00:00.13 bitrate=13157.8kbits/s
  speed=0.126x frame= 73 fps= 47 q=28.0 size= 216kB time=00:00:00.96
  bitrate=1828.9kbits/s speed=0.622x frame= 93 fps= 45 q=28.0 size=
  221kB time=00:00:01.79 bitrate=1009.9kbits/s speed=0.859x frame= 109
  fps= 42 q=28.0 size= 225kB time=00:00:02.45 bitrate= 750.6kbits/s
  speed=0.95x frame= 126 fps= 40 q=28.0 size= 230kB time=00:00:03.16
  bitrate= 594.3kbits/s speed=1.02x frame= 145 fps= 40 q=28.0 size=
  235kB time=00:00:03.95 bitrate= 485.7kbits/s speed=1.09x frame= 162
  fps= 39 q=28.0 size= 239kB time=00:00:04.67 bitrate= 419.3kbits/s
  speed=1.12x frame= 181 fps= 39 q=28.0 size= 244kB time=00:00:05.46
  bitrate= 366.5kbits/s speed=1.17x frame= 193 fps= 33 q=28.0 Lsize=
  248kB time=00:00:05.95 bitrate= 340.4kbits/s speed=1.03x video:217kB
  audio:23kB subtitle:0kB other streams:0kB global headers:0kB muxing
  overhead : 2.834417% [libx264 @ 0x1020600] frame I:1 Avg QP:17.19
  size:212155 [libx264 @ 0x1020600] frame P:48 Avg QP:18.02 size : 140
  [libx264 @ 0x1020600] frame B:144 Avg QP:27.33 size : 43 [libx264 @
  0x1020600] consecutive B-frames : 0.5% 0.0% 0.0% 99.5% [libx264 @
  0x1020600] mb I I16..4 : 3.1% 86.8% 10.2% [libx264 @ 0x1020600] mb P
  I16..4 : 0.0% 0.0% 0.0% P16..4 : 1.0% 0.0% 0.0% 0.0% 0.0% skip:99.0%
  [libx264 @ 0x1020600] mb B I16..4 : 0.0% 0.0% 0.0% B16..8 : 0.1% 0.0%
  0.0% direct : 0.0% skip:99.8% L0 : 9.1% L1:90.9% BI : 0.0% [libx264 @ 0x1020600] 8x8 transform intra:82.0% inter:55.7% [libx264 @ 0x1020600]
  coded y,uvDC,uvAC intra : 87.6% 80.7% 62.5% inter : 0.0% 0.2% 0.0%
  [libx264 @ 0x1020600] i16 v,h,dc,p : 76% 22% 2% 1% [libx264 @
  0x1020600] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu : 11% 15% 24% 7% 9% 7% 10% 6%
  10% [libx264 @ 0x1020600] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu : 23% 27% 9% 7%
  8% 6% 8% 5% 8% [libx264 @ 0x1020600] i8c dc,h,v,p : 55% 23% 14% 8%
  [libx264 @ 0x1020600] Weighted P-Frames : Y:0.0% UV:0.0% [libx264 @
  0x1020600] ref P L0 : 95.1% 0.1% 3.2% 1.6% [libx264 @ 0x1020600] ref B
  L0 : 91.7% 3.3% 5.0% [libx264 @ 0x1020600] ref B L1 : 86.1% 13.9%
  [libx264 @ 0x1020600] kb/s:223.84 0