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• FFMPEG gets stuck on higher resolution or frame rate [H265]

  29 octobre 2015, par Anakooter

  I am running the following command which works perfectly on my system running Elementary OS on Intel Corei5 :

  ffmpeg -f v4l2 -i /dev/video0 -c:v libx265 -x265-params crf=14:vbv-maxrate=128:vbv-bufsize=32:keyint=10:qcomp=0.5:rd=5:ctu=64:min-cu-size=8:cu-lossless=false:fast-intra=false:strong-intra-smoothing=false -tune zerolatency -s 640x480 -preset ultrafast -r 5 -pix_fmt yuv420p -an -strict experimental -f mpegts udp://239.0.0.1:5002

  but if I change the output size to 800x600 and or increase the frame rate from 5 to 10. After a few seconds the video gets stuck.

  I have monitored the CPU usage for both the commands and it is almost identical that is between 300 to 400 percent ( since 4 cores ).

  Any possible answers to mitigate the issue.

  ffmpeg version 2.7.2-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.9.3 (Debian 4.9.3-1)
  
  configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --cc=gcc-4.9
  
  libavutil      54. 27.100 / 54. 27.100
  
  libavcodec     56. 41.100 / 56. 41.100
  
  libavformat    56. 36.100 / 56. 36.100
  
  libavdevice    56.  4.100 / 56.  4.100
  
  libavfilter     5. 16.101 /  5. 16.101
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  2.100 /  1.  2.100
  
  libpostproc    53.  3.100 / 53.  3.100
  
  Routing option strict to both codec and muxer layer
  
  [video4linux2,v4l2 @ 0x4775460] fd:4 capabilities:84000001
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
  Duration: N/A, start: 1223.904801, bitrate: 36864 kb/s
  
  Stream #0:0: Video: rawvideo, 1 reference frame (YUY2 / 0x32595559), yuyv422, 320x240, 36864 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  [graph 0 input from stream 0:0 @ 0x476aae0] w:320 h:240 pixfmt:yuyv422     tb:1/1000000 fr:30/1 sar:0/1 sws_param:flags=2
  
  [scaler for output stream 0:0 @ 0x476a920] w:800 h:600 flags:'0x4' interl:0
  
  [scaler for output stream 0:0 @ 0x476a920] w:320 h:240 fmt:yuyv422 sar:0/1 -> w:800 h:600 fmt:yuv420p sar:0/1 flags:0x4
  
  x265 [info]: HEVC encoder version 1.7+354-b2ba7df1fc69
  
  x265 [info]: build info [Linux][GCC 4.9.3][64 bit] 8bit
  
  x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  x265 [info]: Main profile, Level-3 (Main tier)
  
  x265 [info]: Thread pool created using 4 threads
  
  x265 [info]: frame threads / pool features       : 2 / wpp(10 rows)
  
  x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
  
  x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
  
  x265 [info]: ME / range / subpel / merge         : dia / 57 / 0 / 2
  
  x265 [info]: Keyframe min / max / scenecut       : 1 / 10 / 0
  
  x265 [info]: Lookahead / bframes / badapt        : 0 / 0 / 0
  
  x265 [info]: b-pyramid / weightp / weightb       : 0 / 0 / 0
  
  x265 [info]: References / ref-limit  cu / depth  : 1 / 0 / 0
  
  x265 [info]: Rate Control / qCompress            : CRF-14.0 / 0.50
  
  x265 [info]: VBV/HRD buffer / max-rate / init    : 32 / 64 / 0.900
  
  x265 [info]: tools: rd=5 psy-rd=0.30 early-skip tmvp deblock
  
  [mpegts @ 0x4776b00] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, mpegts, to 'udp://239.0.0.1:5002':
  
  Metadata:
  
  encoder         : Lavf56.36.100
  
  Stream #0:0: Video: hevc (libx265), 1 reference frame, yuv420p, 800x600, q=2-31, 10 fps, 90k tbn, 10 tbc
  
  Metadata:
  
  encoder         : Lavc56.41.100 libx265
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> hevc (libx265))
  
  Press [q] to stop, [?] for help
  
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  *** 1 dup!
  
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  *** 18 dup!
  
  *** 2 dup!
  
  *** 555 dup!fps= 10 q=0.0 size=      86kB time=00:00:08.00 bitrate=  88.4kbits/s dup=21 drop=112    
  
  x265 [warning]: poc:131, VBV underflow (-6152 bits)
  
  x265 [warning]: poc:151, VBV underflow (-17080 bits)
  
  x265 [warning]: poc:211, VBV underflow (-10272 bits)
  
  x265 [warning]: poc:301, VBV underflow (-9024 bits)
  
  x265 [warning]: poc:391, VBV underflow (-11368 bits)
  
  x265 [warning]: poc:501, VBV underflow (-6152 bits)
  
  x265 [warning]: poc:559, VBV underflow (-320 bits)
  
  x265 [warning]: poc:581, VBV underflow (-16552 bits)
  
  *** dropping frame 639 from stream 0 at ts 344=00:01:03.70 bitrate=  81.3kbits/s dup=576 drop=112    
  
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  *** 70055 dup!

• ffmpeg downloading parts of Youtube videos but for some of them they have a black screen for a few seconds

  29 septembre 2021, par user14702793

  So im using ffmpeg to download some youtube videos with specific start and stop times. My code looks like os.system("ffmpeg -i $(youtube-dl --no-check-certificate -f 18 --get-url %s) -ss %s -to %s -c:v copy -c:a copy %s"% (l, y, z, w)) where the variables would all be the name of the file, the url, and the start and stop times. Some of the vidoes come out just fine, others have a black screen and only a portion of the video, and a very few amount have just audio files. My time is formated as x.y where x would be the seconds and y would be the milliseconds. Is this the issue so I need to transform it to 00:00:00.0 format ? Any help is appreciated

  


• FFmpeg output stopping early when piping through stdin

  6 juillet 2022, par Null User

  I am receiving audio data encoded using Ogg Vorbis through a stream, and piping that data to FFmpeg's stdin in order to convert it into Opus. Here is the command I'm using :

  


  ffmpeg -hide_banner -i pipe: -acodec libopus -f opus -ar 48000 -ac 2 -b:a 64000 -filter_complex volume=0.2 pipe:1


  


  Unfortunately, the output audio stops a few seconds before the end of the file.

  


  Looking at the FFmpeg logs, I can see this warning appear many times during the conversion :

  


  [libopus @ 0000025190d06a00] Queue input is backward in time
    Last message repeated 9 times
size=     728kB time=00:00:45.05 bitrate= 132.4kbits/s speed=1.26x    
[libopus @ 0000025190d06a00] Queue input is backward in time
    Last message repeated 11 times
size=     793kB time=00:00:49.07 bitrate= 132.4kbits/s speed=1.24x    
[libopus @ 0000025190d06a00] Queue input is backward in time
    Last message repeated 8 times


  


  My guess is that for some reason the inputs I'm receiving are reversed, and on the last chunk of data the "end of stream" vorbis packet comes first, therefore FFmpeg stops processing the rest of the data.

  


  Saving the stream to a file and encoding the file instead of the stream doesn't cause this to happen. This seems to be exclusive to stdin streams.

  


  Is there a way to tell FFmpeg to ignore the "end of stream" signal ?