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• How to save movie from behind ? [on hold]

  16 mai 2017, par Nips

  I must convert my mp4 camera movie, to play it from behind. Is this possible in ffmpeg ?
  Or maybe html5 can play a movie from behind ?

  In a film I have closeup on the object, I must play it as move away from the object.

• FFMPEG save udp stream to mp4 file

  17 juillet 2020, par DoriHp 0

  I'm facing some trouble when using ffmpeg to save an udp stream into a mp4 file. When receiving and playing with ffplay by this command

  


  ffplay -i udp://127.0.0.1:10000

  


  everything is ok, but when I save to mp4 file with this command

  


  ffmpeg -i udp://127.0.0.1:10000 -vcodec libx264 -an -pix_fmt yuv420p -r 20 test.mp4

  


  the created mp4 file has only 15 secs length but my streaming was 1 min. I found a solution

  


  ffmpeg -i udp://127.0.0.1:10000 -r 20 -filter:v "setpts=PTS*0.25" -vcodec libx264 -an -pix_fmt yuv420p test.mp4

  


  by using setpts video filter, but video's length still wasn't same as the stream.
My udp stream's properties, get by using ffprobe :

  


  [STREAM]                                          
index=0                                           
codec_name=h264                                   
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 
profile=High 4:4:4 Predictive                     
codec_type=video                                  
codec_time_base=1/40                              
codec_tag_string=[27][0][0][0]                    
codec_tag=0x001b                                  
width=1280                                        
height=720                                        
coded_width=1280                                  
coded_height=720                                  
closed_captions=0                                 
has_b_frames=0                                    
sample_aspect_ratio=N/A                           
display_aspect_ratio=N/A                          
pix_fmt=yuv444p                                   
level=31                                          
color_range=unknown                               
color_space=unknown                               
color_transfer=unknown                            
color_primaries=unknown                           
chroma_location=left                              
field_order=progressive                           
timecode=N/A                                      
refs=1                                            
is_avc=false                                      
nal_length_size=0                                 
id=0x100                                          
r_frame_rate=20/1                                 
avg_frame_rate=20/1                               
time_base=1/90000                                 
start_pts=420655500                               
start_time=4673.950000                            
duration_ts=N/A                                   
duration=N/A                                      
bit_rate=N/A                                      
max_bit_rate=N/A                                  
bits_per_raw_sample=8                             
nb_frames=N/A                                     
nb_read_frames=N/A                                
nb_read_packets=N/A                               
DISPOSITION:default=0                             
DISPOSITION:dub=0                                 
DISPOSITION:original=0                            
DISPOSITION:comment=0                             
DISPOSITION:lyrics=0                              
DISPOSITION:karaoke=0                             
DISPOSITION:forced=0                              
DISPOSITION:hearing_impaired=0                    
DISPOSITION:visual_impaired=0                     
DISPOSITION:clean_effects=0                       
DISPOSITION:attached_pic=0                        
DISPOSITION:timed_thumbnails=0                    
[/STREAM]                                         
[FORMAT]                                          
filename=udp://127.0.0.1:10000                    
nb_streams=1                                      
nb_programs=1                                     
format_name=mpegts                                
format_long_name=MPEG-TS (MPEG-2 Transport Stream)
start_time=4673.950000                            
duration=N/A                                      
size=N/A                                          
bit_rate=N/A                                      
probe_score=50                                    
[/FORMAT]                                         


  


• FFmpeg wrong duration(double) when convert mp4

  13 novembre 2017, par crazymxm

  The output file has the double duration :

  Source video duration :00:01:58.88

  output video duration :00:03:57.76

  （video’s duration is double ，audio’s duration is correct. So， the video looks like played twice, with no sound in the second half ）

  here is the log：

  ./ffmpeg -i /Volumes/LANKEXIN/1383.mp4 out.mp4
  ffmpeg version N-82977-g8fd3e02-tessus Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  configuration : —cc=/usr/bin/clang —prefix=/opt/ffmpeg —extra-version=tessus —enable-avisynth —enable-fontconfig —enable-gpl —enable-libass —enable-libbluray —enable-libfreetype —enable-libgsm —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopus —enable-libschroedinger —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzmq —enable-version3 —disable-ffplay —disable-indev=qtkit —disable-indev=x11grab_xcb
  

    libavutil      55. 43.100 / 55. 43.100
  
    libavcodec     57. 70.100 / 57. 70.100
  
    libavformat    57. 61.100 / 57. 61.100
  
    libavdevice    57.  2.100 / 57.  2.100
  
    libavfilter     6. 68.100 /  6. 68.100
  
    libswscale      4.  3.101 /  4.  3.101
  
    libswresample   2.  4.100 /  2.  4.100
  
    libpostproc    54.  2.100 / 54.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Volumes/LANKEXIN/1383.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isom
  
      creation_time   : 2017-10-30T14:58:05.000000Z
  
      encoder         : mp4creator 1.6.1d
  
    Duration: 00:01:58.88, start: 0.000000, bitrate: 1918 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 1729 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-10-30T14:58:05.000000Z
  
        encoder         : VC Coding
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-10-30T14:58:05.000000Z
  
  File 'out.mp4' already exists. Overwrite ? [y/N] y
  
  [libx264 @ 0x7fbaca003c00] using SAR=1/1
  
  [libx264 @ 0x7fbaca003c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
  [libx264 @ 0x7fbaca003c00] profile High, level 3.1
  
  [libx264 @ 0x7fbaca003c00] 264 - core 148 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - 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=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, mp4, to 'out.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42isom
  
      encoder         : Lavf57.61.100
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-10-30T14:58:05.000000Z
  
        encoder         : Lavc57.70.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-10-30T14:58:05.000000Z
  
        encoder         : Lavc57.70.100 aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  frame=   46 fps=0.0 q=0.0 size=       0kB time=00:00:00.93 bitrate=   0.0kbits/sframe=   64 fps= 45 q=28.0 size=     137kB time=00:00:01.66 bitrate= 672.2kbits/frame=   85 fps= 44 qframe= 5944 fps= 33 q=-1.0 Lsize=   38746kB time=00:03:57.64 bitrate=1335.7kbits/s speed=1.33x    4kB time=00:00:02.94 bitrate= 818.0kbits/s speed= 1.2x    
  
  video:36779kB audio:1846kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.311413%
  
  [libx264 @ 0x7fbaca003c00] frame I:24    Avg QP:19.49  size: 67090
  
  [libx264 @ 0x7fbaca003c00] frame P:1806  Avg QP:21.65  size: 14304
  
  [libx264 @ 0x7fbaca003c00] frame B:4114  Avg QP:25.42  size:  2484
  
  [libx264 @ 0x7fbaca003c00] consecutive B-frames:  2.2%  8.1% 25.5% 64.2%
  
  [libx264 @ 0x7fbaca003c00] mb I  I16..4: 20.6% 55.8% 23.6%
  
  [libx264 @ 0x7fbaca003c00] mb P  I16..4:  5.2%  9.3%  0.8%  P16..4: 36.0%  9.9%  4.2%  0.0%  0.0%    skip:34.5%
  
  [libx264 @ 0x7fbaca003c00] mb B  I16..4:  0.5%  1.0%  0.0%  B16..8: 27.2%  1.8%  0.2%  direct: 0.9%  skip:68.5%  L0:48.6% L1:47.6% BI: 3.8%
  
  [libx264 @ 0x7fbaca003c00] 8x8 transform intra:60.9% inter:78.2%
  
  [libx264 @ 0x7fbaca003c00] coded y,uvDC,uvAC intra: 38.3% 61.5% 12.3% inter: 6.6% 11.3% 0.6%
  
  [libx264 @ 0x7fbaca003c00] i16 v,h,dc,p: 22% 35% 10% 33%
  
  [libx264 @ 0x7fbaca003c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 24% 21%  5%  6%  6%  6%  5%  6%
  
  [libx264 @ 0x7fbaca003c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 33% 11%  4%  7%  6%  6%  4%  4%
  
  [libx264 @ 0x7fbaca003c00] i8c dc,h,v,p: 43% 30% 20%  7%
  
  [libx264 @ 0x7fbaca003c00] Weighted P-Frames: Y:0.3% UV:0.2%
  
  [libx264 @ 0x7fbaca003c00] ref P L0: 73.5%  9.0% 13.8%  3.7%  0.0%
  
  [libx264 @ 0x7fbaca003c00] ref B L0: 92.4%  6.6%  1.1%
  
  [libx264 @ 0x7fbaca003c00] ref B L1: 97.7%  2.3%
  
  [libx264 @ 0x7fbaca003c00] kb/s:1267.21
  
  [aac @ 0x7fbaca021800] Qavg: 897.576