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• ffmpeg image sequence from text file not rendering correctly

  4 juillet 2018, par Rich

  I’ve been working with ffmpeg and I have got it to work perfectly quite a few times, but as of recent I am running into an issue where all the images from my text file arent used.

  My text file looks like -

  ffconcat version 1.0
  
  file 'gallery-house-77-west-55th-street-01.jpg'
  
  duration 4.44
  
  file 'img03.jpg'
  
  duration 4.44
  
  file 'inside.png'
  
  duration 4.44
  
  file 'placeholder.png'

  (amount of files, file names and extensions will always vary)

  And I’ve tried several combinations but as of now my ffmpeg function looks like —

  ffmpeg -i audio.mp3 -safe 0 -f concat -i paths.txt -c:a copy -c:v libx264 \
  
  -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,fps=25,format=yuv420p" -vsync vfr -movflags +faststart -y output.mp4 2>&1');

  When trying to run it, the video seems to convert but has various weird behaviors - sometimes only the middle file(image) in the list is shown or the first 2 only are shown/rendered.

  The audio is playing correctly though.

  I’ve tried setting the framerate for the input and I also tried setting it for the output but it leads to more strange behavior.

  This is what is echoed when running my above ffmpeg command -

   libavutil      56. 15.100 / 56. 15.100
  
    libavcodec     58. 19.100 / 58. 19.100
  
    libavformat    58. 13.100 / 58. 13.100
  
    libavdevice    58.  4.100 / 58.  4.100
  
    libavfilter     7. 18.100 /  7. 18.100
  
    libswscale      5.  2.100 /  5.  2.100
  
    libswresample   3.  2.100 /  3.  2.100
  
    libpostproc    55.  2.100 / 55.  2.100
  
  [mp3 @ 0xb46780] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'audio.mp3':
  
    Metadata:
  
      encoder         : Lavf57.71.100
  
    Duration: 00:00:19.98, start: 0.000000, bitrate: 48 kb/s
  
      Stream #0:0: Audio: mp3, 22050 Hz, mono, fltp, 48 kb/s
  
  Input #1, concat, from 'paths.txt':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 754x424 [SAR 72:72 DAR 377:212], 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0xba25c0] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 0xb710c0] using SAR=3393/3392
  
  [libx264 @ 0xb710c0] using cpu capabilities: none!
  
  [libx264 @ 0xb710c0] profile High, level 3.1
  
  [libx264 @ 0xb710c0] 264 - core 155 r2901 7d0ff22 - 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
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf58.13.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 3393:3392 DAR 377:212], q=-1--1, 25 fps, 12800 tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc58.19.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (mp4a / 0x6134706D), 22050 Hz, mono, fltp, 48 kb/s
  
  [swscaler @ 0xb93140] deprecated pixel format used, make sure you did set range correctly
  
  [swscaler @ 0xb93140] Warning: data is not aligned! This can lead to a speed loss
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (cd)
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (c8)
  
  [mjpeg @ 0xb6e200] Found EOI before any SOF, ignoring
  
  [mjpeg @ 0xb6e200] mjpeg: unsupported coding type (c7)
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  [mjpeg @ 0xb6e200] invalid id 94
  
  Error while decoding stream #1:0: Invalid data found when processing input
  
  [mp4 @ 0xb6f8c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=    1 fps=0.0 q=28.0 Lsize=     179kB time=00:00:19.95 bitrate=  73.6kbits/s speed=44.1x    
  
  video:58kB audio:117kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.446521%
  
  [libx264 @ 0xb710c0] frame I:1     Avg QP:28.86  size: 58683
  
  [libx264 @ 0xb710c0] mb I  I16..4: 21.2% 59.8% 19.0%
  
  [libx264 @ 0xb710c0] 8x8 transform intra:59.8%
  
  [libx264 @ 0xb710c0] coded y,uvDC,uvAC intra: 50.5% 65.2% 31.6%
  
  [libx264 @ 0xb710c0] i16 v,h,dc,p: 10% 60%  3% 28%
  
  [libx264 @ 0xb710c0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 27% 26%  4%  4%  4%  6%  4%  7%
  
  [libx264 @ 0xb710c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 33% 10%  5%  6%  5%  8%  5%  7%
  
  [libx264 @ 0xb710c0] i8c dc,h,v,p: 47% 34% 11%  8%
  
  [libx264 @ 0xb710c0] kb/s:11736.60

  Any ideas whats causing the image sequence to fail ?

  EDIT

  After some more debugging I think it may be related to the fact that all the files dont have the same extension. How can I make it so that it doesn’t have to be that way or is that already a default setting and the issue is else where ?

• ffmpeg get frame time stamp

  19 novembre 2018, par Anshul G.

  I am trying to record a webcam video using ffmpeg. I have a logitech c922 Pro Stream Webcam. This is the command that I use :

  ffmpeg -f v4l2 -framerate 60 -video_size 1280x720 -input_format mjpeg -i /dev/video1 out.mp4

  My application requires me to get the exact timestamp for every frame. While I could use my knowledge of the framerate and frame number to add the required interval to the start time, I am afraid that this might not be completely accurate.

  Firstly, I have noticed that while recording, the console seems to initially display a far higher fps than the one I have set :

  Press [q] to stop, [?] for help
  
  frame=  177 fps= 85 q=-1.0 Lsize=     502kB time=00:00:02.91 bitrate=1410.8kbits/s dup=144 drop=0    

  Also, I think that ffmpeg drops frames in between sometimes.

  However, my videos seem to have the correct number of frames so I think that the fps value displayed could instead be referring to the encoding/ decoding speed. I am not sure about frame dropping.

  I would be happy of you could let me know what you think, or suggest an alternative so that I can timestamp my frames accurately. Thanks !

  Edit :

  I have understood that frame rate is correlated to ambient light which can lead to high duplication in frames. I am currently recording on windows and have set frame rate as the priority in logitech gaming software. However there is still the occasional drop in frame or duplication. Does this affect time stamp of the frames ? Or can I extrapolate from the start time ?

• avcodec/mips : [loongson] fix improper use of register constraints.

  6 septembre 2018, par Shiyou Yin

  avcodec/mips : [loongson] fix improper use of register constraints.
  Constraint "g" means compiler can store variable in memory or register.
  
  When we use constraint "g" for a variable and this variable was operated by
  
  instruction which only support register operands may lead "invalid operands" error.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mips/vc1dsp_mmi.c