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• Core : fixed Regular Expression Denial of Service vulnerability (#2371)

  9 janvier 2021, par staabm

  Core : fixed Regular Expression Denial of Service vulnerability (#2371)
  ReDoS, or Regular Expression Denial of Service, is a vulnerability affecting
  
  poorly constructed and potentially inefficient regular expressions which can
  
  make them perform extremely badly given a creatively constructed input string.
  GHSL-2020-294
  credits to @erik-krogh for reporting the issue and providing a fix
  

• ffmpeg Output file #0 does not contain any stream when rtsp to png

  10 avril 2022, par Alan Sereb

  I want to take 1 frame from a video and put it to png as a thumbnail and refresh it once in a while, so I run :

  


  ffmpeg -y -i 'rtsp://192.168.2.123' -s 240x135 -vf fps=1 %d.jpg


  


  I get the output :

  


  Input #0, rtsp, from 'rtsp://192.168.2.123':
  Metadata:
    title           : RTSP Server
  Duration: N/A, bitrate: 64 kb/s
    Stream #0:0: Video: h264, none, 90k tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Output #0, image2, to '%d.jpg':
Output file #0 does not contain any stream


  


  ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers


  


  What am I doing wrong ?

  


• FFMPEG, H264 Encoding : If frame size exceeds level limit, does it lead to video encoding failed ?

  4 février 2021, par Nafia Mahjabin

  I want to reencode an mp4 file with h264 encoding.
Run the following command :

  


  


  ffmpeg -i input.mp4 -f mp4 -vcodec h264 -profile:v baseline -level 3.0 -pix_fmt yuv420p -color_range 2 -vf scale=1080:1920 -acodec aac -async 1 output.mp4

  


  


  Process fails saying Video encoding failed.
Error Message given by ffmpeg :

  


  [h264 @ 0x7a467000] Reinit context to 640x1152, pix_fmt: yuv420p\n
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':\n 
 Metadata:\n 
 major_brand     : mp42\n 
   minor_version   : 0\n 
   compatible_brands: mp42mp41iso4\n   
   creation_time   : 2020-07-26T20:32:55.000000Z\n 
   Duration: 00:00:36.20, start: 0.000000, bitrate: 938 kb/s\n 
   Stream #0:0(und): Video: h264, 1 reference frame (avc1 / 0x31637661), yuv420p(left), 640x1138 (640x1152), 935 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)\n 
   Metadata:\n     
   creation_time   : 2020-07-26T20:32:55.000000Z\n    
   handler_name    : Vireo Eyes v2.5.3\n   
   encoder         : AVC Coding\n
   Matched encoder 'libx264' for codec 'h264'.\n
   Stream mapping:\n  
   Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))\nPress [q] to stop, [?] for help\n
   [Parsed_scale_0 @ 0x80be6220] w:1080 h:1920 flags:'bicubic' interl:0\n
   [graph 0 input from stream 0:0 @ 0x80be6280] w:640 h:1138 pixfmt:yuv420p tb:1/15360 fr:30/1 sar:0/1\n
   [graph 0 input from stream 0:0 @ 0x80be6280] sws_param option is deprecated and ignored\n[Parsed_scale_0 @ 0x80be6220] w:640 h:1138 fmt:yuv420p sar:0/1 -> w:1080 h:1920 fmt:yuv420p sar:0/1 flags:0x4\n
   [libx264 @ 0x7a1d4000] frame MB size (68x120) > level limit (1620)\n
   [libx264 @ 0x7a1d4000] DPB size (1 frames, 8160 mbs) > level limit (0 frames, 8100 mbs)\n
   [libx264 @ 0x7a1d4000] MB rate (244800) > level limit (40500)\n[libx264 @ 0x7a1d4000] using cpu capabilities: ARMv6 NEON\n
   [libx264 @ 0x7a1d4000] profile Constrained Baseline, level 3.0, 4:2:0, 8-bit\n[libx264 @ 0x7a1d4000] 264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 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\n
   Output #0, mp4, to 'output.mp4':\n 
   Metadata:\n 
   major_brand     : mp42\n   
   minor_version   : 0\n 
   compatible_brands: mp42mp41iso4\n   
   encoder         : Lavf58.48.100\n   
   Stream #0:0(und): Video: h264 (libx264), 1 reference frame (avc1 / 0x31637661), yuv420p(pc, left), 1080x1920, q=-1--1, 30 fps, 15360 tbn, 30 tbc (default)\n
   Metadata:\n   
   creation_time   : 2020-07-26T20:32:55.000000Z\n    
   handler_name    : Vireo Eyes v2.5.3\n  
   encoder         : Lavc58.96.100 libx264\n    
   Side data:\n 
   cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A\n
   frame=    3 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=    7 fps=6.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   11 fps=6.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   15 fps=6.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   19 fps=6.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   23 fps=6.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   26 fps=6.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   30 fps=6.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   frame=   33 fps=6.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    \n
   Video encoding failed\n[AVIOContext @ 0x7a42cd80] Statistics: 0 seeks, 1 writeouts\n
   [AVIOContext @ 0x7a42ccc0] Statistics: 229376 bytes read, 0 seeks\nConversion failed!\n\n\n\n\n


  


  I tried to figure out the reason for fail. I'm guessing from error message from the line frame MB size (68x120) > level limit (1620), frame size exceeds h264 level limits may be the issue.

  


  Is it the issue ? if it is, what's the solution for this ? if it's not, what went wrong ?

  


  Can somebody help please ? Thank you !