Recherche avancée

Sur d’autres sites (8143)

• avformat/dhav : Check amount read

  22 mai 2024, par Andreas Rheinhardt

  avformat/dhav : Check amount read
  Prevents potential use of uninitialized data in the following
  
  memcmp().
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/dhav.c

• How to scroll long picture(big height) scrolling with background image in ffmpeg,Text in video products will flicker

  15 juin 2022, par user18550619

  use overlay or scoll filter,the result of video still flicker !
ffmepg cmd as follow :

  


  1.scoll filter

  


  ffmpeg -y -loop 1 -i input.png -i bg.png -filter_complex "[0]scroll=vertical=0.000819672131147541,crop=iw:1280:0:0,format=yuva444p[scrollView] ;[1][scrollView]overlay=0:0:enable='between (t,0,27.466666666666665)'" -t 27.466666666666665 E :\output1.mp4

  


  2.overlay with time change y position

  


  ffmpeg -y -r 1 -loop 1 -t 27.466666666666665 -i input.png -filter_complex "color=white:s=720x1280,fps=fps=30[bg] ;movie=bg.png[bg1] ;[bg][bg1]overlay=0:0[bg2] ;[bg2][0]overlay=y=-'t*60':shortest=1[video]" -preset ultrafast -b:v 1989k -map [video] E :\output2.mp4

  


  input.png

  


  bg.png

  


• Error while opening encoder for output stream #1:2 - maybe incorrect parameters such as bit_rate, rate, width or height

  14 novembre 2019, par geo-freak

  I am encoding a video which has dvb_teletext inside. I got an error saying Error while opening encoder for output stream #1:2. I used the following command to encode my video.

  ffmpeg -threads 8 -i input.ts -s 400x222 -qscale:v 4 -vcodec libx264 -s 320x240 -b:v 512000 -maxrate 512000 -acodec libfaac -b:a 32000 -ar 48000 -force_key_frames expr:gte(t,n_forced*3) -hls_flags single_file -hls_list_size 0 -hls_time 3 -y output.m3u8

  You can see the log output of my command.

  Input #0, mpegts, from 'pipe:':
  
    Duration: N/A, start: 91105.257722, bitrate: N/A
  
    Program 1 
  
      Stream #0:0[0x4b1]: Video: h264 (High), 4 reference frames ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg), 704x576 [SAR 16:11 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0xc7d](swe): Audio: mp2 ([4][0][0][0] / 0x0004), 48000 Hz, stereo, s16p, 256 kb/s
  
      Stream #0:2[0x1932](swe,nor,dan,fin,swe): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006), 492x250
  
  [Parsed_fps_0 @ 0x55975e31b7e0] fps=1/1
  
  [graph 0 input from stream 0:0 @ 0x55975e1fb9c0] w:704 h:576 pixfmt:yuv420p tb:1/90000 fr:25/1 sar:16/11 sws_param:flags=2
  
  [scaler for output stream 0:0 @ 0x55975e1f8fe0] w:400 h:222 flags:'bicubic' interl:0
  
  [swscaler @ 0x55975e1a0c80] deprecated pixel format used, make sure you did set range correctly
  
  [scaler for output stream 0:0 @ 0x55975e1f8fe0] w:704 h:576 fmt:yuv420p sar:16/11 -> w:400 h:222 fmt:yuvj420p sar:74/75 flags:0x4
  
  [graph 1 input from stream 0:0 @ 0x55975e177120] w:704 h:576 pixfmt:yuv420p tb:1/90000 fr:25/1 sar:16/11 sws_param:flags=2
  
  [scaler for output stream 1:0 @ 0x55975e1f1020] w:320 h:240 flags:'bicubic' interl:0
  
  [scaler for output stream 1:0 @ 0x55975e1f1020] w:704 h:576 fmt:yuv420p sar:16/11 -> w:320 h:240 fmt:yuv420p sar:4/3 flags:0x4
  
  [graph 2 input from stream 0:1 @ 0x55975e532f20] tb:1/48000 samplefmt:s16p samplerate:48000 chlayout:0x3
  
  [audio format for output stream 1:1 @ 0x55975e533540] auto-inserting filter 'auto-inserted resampler 0' between the filter 'Parsed_anull_0' and the filter 'audio format for output stream 1:1'
  
  [auto-inserted resampler 0 @ 0x55975e5358e0] ch:2 chl:stereo fmt:s16p r:48000Hz -> ch:2 chl:stereo fmt:s16 r:48000Hz
  
  [libx264 @ 0x55975e2349a0] VBV maxrate specified, but no bufsize, ignored
  
  [libx264 @ 0x55975e2349a0] using SAR=4/3
  
  [libx264 @ 0x55975e2349a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x55975e2349a0] profile High, level 2.0
  
  Output #0, hls, to 'output.m3u8':
  
      Stream #1:0: Video: h264 (libx264), -1 reference frame, yuv420p, 320x240 [SAR 4:3 DAR 16:9], q=-1--1, 512 kb/s, 25 fps, 25 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.24.102 libx264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
      Stream #1:1(swe): Audio: aac (libfaac), 48000 Hz, stereo, s16, 32 kb/s
  
      Metadata:
  
        encoder         : Lavc57.24.102 libfaac
  
      Stream #1:2(swe,nor,dan,fin,swe): Subtitle: webvtt, 128 kb/s
  
      Metadata:
  
        encoder         : Lavc57.24.102 webvtt
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  
    Stream #0:0 -> #1:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #1:1 (mp2 (native) -> aac (libfaac))
  
    Stream #0:2 -> #1:2 (dvb_teletext (libzvbi_teletextdec) -> webvtt (native))
  
  Error while opening encoder for output stream #1:2 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  [Parsed_fps_0 @ 0x55975e31b7e0] 0 frames in, 0 frames out; 0 frames dropped, 0 frames duplicated.
  
  [libx264 @ 0x55975e2349a0] final ratefactor: 23.40
  
  (END)

  Do I need to use map options here ? How to resolve this ? Any help or suggestion ?