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• "File descriptor in bad state" error while running ffmpeg on android device and selecting an input device

  25 août 2012, par user1545779

  Below is the output of the ffmpeg command :# ./ffmpeg -y -f s16le -i /dev/snd/pcmC3D0c 1640.wmv -to create an audio file from a Logitech webcam on an android device.

  As shown in the output, I received a File descriptor in bad state error for referring to the mic input as /dev/snd/pcmC3D0c I determined the value of the device (webcam mic) by reviewing the contents of /proc/asound. The webcam mic was card3 and its STREAM0 file indicated that the mic has an audio format of format S16_LE

  It was also confirmed that it is a capture device and its' pcm id was pcmC3D0c (C3 being the card number and D0 being the Device number. I then confirmed the correct device by checking the /dev/snd/ directory to confirm its proper and full description. The /dev/snd folder confirmed that the mic was /dev/snd/pcmC3D0c

  I then checked the permissions and ownership to make sure that I could use that device. Hence as far as identifying the correct device to used I do believe that /dev/snd/pcmC3D0c is the correct device. I do believe this error could possibly have something to do with the OS, however after all these checks, I still cannot figure out what is giving the bad file descriptor state error.

  Please note that I tested for different output formats, etc and that did not make any difference. Any leads or suggestions ?

  # ./ffmpeg -y -f s16le -i /dev/snd/pcmC3D0c 1640.wmv

  ffmpeg version N-43170-gd84dd35 Copyright (c) 2000-2012 the FFmpeg developers
  built on Aug 24 2012 09:16:05 with gcc 4.4.3 (GCC) configuration : —enable-cross-compile —arch=arm —cpu=cortex-a9 —target-os=linux —enable-runtime-cpudetect —prefix=/output —enable-pic —cross-prefix=/home/jasongipsyblues/Desktop/apps/android-ndk-r8b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- —sysroot=/home/jasongipsyblues/Desktop/apps/android-ndk-r8b/platforms/android-14/arch-arm —enable-version3 —enable-gpl —enable-memalign-hack —disable-doc —enable-yasm —enable-libx264 —enable-zlib —extra-cflags=-I../x264 —extra-ldflags='-L../x264 -lc'

  libavutil 51. 66.100 / 51. 66.100
  libavcodec 54. 48.100 / 54. 48.100
  libavformat 54. 22.100 / 54. 22.100
  libavdevice 54. 2.100 / 54. 2.100
  libavfilter 3. 5.102 / 3. 5.102
  libswscale 2. 1.100 / 2. 1.100
  libswresample 0. 15.100 / 0. 15.100
  libpostproc 52. 0.100 / 52. 0.100

  [s16le @ 0xfd84f0] Invalid sample rate 0 specified using default of 44100
  [s16le @ 0xfd84f0] Estimating duration from bitrate, this may be inaccurate
  Guessed Channel Layout for Input Stream #0.0 : mono
  Input #0, s16le, from '/dev/snd/pcmC3D0c' :
  Duration : N/A, bitrate : 705 kb/s
  Stream #0:0 : Audio : pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
  Output #0, asf, to '1640.wmv' :
  Metadata :
  WM/EncodingSettings : Lavf54.22.100
  Stream #0:0 : Audio : wmav2 (a[1][0][0] / 0x0161), 44100 Hz, mono, s16, 128 kb/s
  Stream mapping :
  Stream #0:0 -> #0:0 (pcm_s16le -> wmav2)
  Press [q] to stop, [?] for help
  
  /dev/snd/pcmC3D0c : File descriptor in bad state
  size= 1kB time=00:00:00.00 bitrate= 0.0kbits/s
  video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead 5340.000000%

• Raspberry Pi 4 live streaming with ffmpeg [closed]

  12 décembre 2019, par Berri

  So speedify created a blog post and youtube video about making an IRL streaming backpack using the Elgato Cam Link 4k, Raspberry Pi 4, and ffmpeg.

  They gave pretty detailed instructions, and included downloads to prebuilt scripts/commands to get it all running once put together.
  Blog post :
  https://speedify.com/blog/how-to/build-irl-streaming-backpack-complete-guide/

  ffmpeg command from post :

  ffmpeg_command = “/home/pi/bin/ffmpeg -nostdin -re -f v4l2 -s ‘1280×720’ -framerate 24 -i /dev/video0 -f alsa -ac 2 -i hw:CARD=Link,DEV=0 -vcodec libx264 -framerate 24 -rtbufsize 1500k -s 1280×720 -preset ultrafast -pix_fmt yuv420p -crf 17 -force_key_frames ‘expr:gte(t,n_forced*2)’ -minrate 850k -maxrate 1000k -b:v 1000k -bufsize 1000k -acodec libmp3lame -rtbufsize 1500k -b 96k -ar 44100 -f flv – | ffmpeg -f flv -i – -c copy -f flv -drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1 rtmp://live.twitch.tv/app/live_” + streamKey + “‘\n” 

  I replaced -i hw:card=link,dev=0 in that command with -i hw:2,0 because -i hw:card=link,dev=0 gave me "file does not exist" errors in the log. "streamkey" is filled with the appropriate key for my twitch.

  Github Resources + Instructions used :
  https://github.com/speedify/rpi-streaming-experiment

  I’m using all the exact same hardware as outlined in the post, and have gotten everything installed correctly as far as I can tell.
  But when I go to run the ffmpeg command, it seems like nothing actually gets sent over to twitch correctly.

  The log after trying to run it looks like this.
  If anybody has any insight as to what may be going wrong, it would be greatly appreciated.

  Starting ffmpeg
  
  ffmpeg version N-95970-gd5274f8 Copyright (c) 2000-2019 the FFmpeg developers
  
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)  
  
  configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/pi/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree  
  
  libavutil 56. 36.101 / 56. 36.101  
  
  libavcodec 58. 64.101 / 58. 64.101  
  
  ffmpeg version N-95970-gd5274f8 libavformat 58. 35.101 / 58. 35.101  
  
  Copyright (c) 2000-2019 the FFmpeg developers libavdevice 58. 9.101 / 58. 9.101  
  
  libavfilter 7. 67.100 / 7. 67.100  
  
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)  
  
  libswscale 5. 6.100 / 5. 6.100  
  
  configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/pi/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree  
  
  libswresample 3. 6.100 / 3. 6.100  
  
  libpostproc 55. 6.100 / 55. 6.100  
  
  libavutil 56. 36.101 / 56. 36.101  
  
  libavcodec 58. 64.101 / 58. 64.101  
  
  libavformat 58. 35.101 / 58. 35.101  
  
  libavdevice 58. 9.101 / 58. 9.101  
  
  libavfilter 7. 67.100 / 7. 67.100  
  
  libswscale 5. 6.100 / 5. 6.100  
  
  libswresample 3. 6.100 / 3. 6.100  
  
  libpostproc 55. 6.100 / 55. 6.100  
  
  [video4linux2,v4l2 @ 0x2aac5e0] The V4L2 driver changed the video from 1280x720 to 1920x1080  
  
  [video4linux2,v4l2 @ 0x2aac5e0] The driver changed the time per frame from 1/24 to 117/7013  
  
  [video4linux2,v4l2 @ 0x2aac5e0] Dequeued v4l2 buffer contains 4147200 bytes, but 3110400 were expected. Flags: 0x00012001.  
  
  Input #0, video4linux2,v4l2, from '/dev/video0':  
  
  Duration: N/A, start: 4683.201589, bitrate: 1491503 kb/s  
  
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 1491503 kb/s, 59.94 fps, 59.94 tbr, 1000k tbn, 1000k tbc  
  
  Guessed Channel Layout for Input Stream #1.0 : stereo  
  
  Input #1, alsa, from 'hw:2,0':  
  
  Duration: N/A, start: 1576099663.557438, bitrate: 1536 kb/s  
  
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s  
  
  Please use -b:a or -b:v, -b is ambiguous  
  
  Stream mapping:  
  
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))  
  
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))  
  
  [video4linux2,v4l2 @ 0x2aac5e0] Dequeued v4l2 buffer contains 4147200 bytes, but 3110400 were expected. Flags: 0x00012001.  
  
  Last message repeated 9 times
  
  [video4linux2,v4l2 @ 0x2aac5e0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)  
  
  [video4linux2,v4l2 @ 0x2aac5e0] Dequeued v4l2 buffer contains 4147200 bytes, but 3110400 were expected. Flags: 0x00012001.  
  
  Last message repeated 28 times  
  
  terminated script  
  
  pipe:: could not find codec parameters  
  
  Exiting normally, received signal 15.  
  
  Last message repeated 15 times  
  
  [alsa @ 0x2aaf2c0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)  
  
  Finishing stream 0:0 without any data written to it.  
  
  [libx264 @ 0x2abee40] using cpu capabilities: ARMv6 NEON  
  
  [libx264 @ 0x2abee40] profile Constrained Baseline, level 3.2, 4:2:0, 8-bit  
  
  [libx264 @ 0x2abee40] 264 - core 158 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 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=0 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=17.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1000 vbv_bufsize=1000 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0  
  
  Finishing stream 0:1 without any data written to it.  
  
  Output #0, flv, to 'pipe:':  
  
  Metadata:  
  
  encoder : Lavf58.35.101  
  
  Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1280x720, q=-1--1, 96 kb/s, 59.94 fps, 1k tbn, 59.94 tbc  
  
  Metadata:  
  
  encoder : Lavc58.64.101 libx264  
  
  Side data:  
  
  cpb: bitrate max/min/avg: 1000000/0/96000 buffer size: 1000000 vbv_delay: N/A  
  
  Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p  
  
  Metadata:  
  
  encoder : Lavc58.64.101 libmp3lame  
  
  [flv @ 0x2abda90] Failed to update header with correct duration.  
  
  [flv @ 0x2abda90] Failed to update header with correct filesize.  
  
  Error writing trailer of pipe:: Broken pipe  
  
  frame= 0 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown  
  
  Exiting normally, received signal 15.         

  This message repeats until script is terminated with the Circuit Express button. For length, many instances of this line were cut out.

  [video4linux2,v4l2 @ 0x2aac5e0] Dequeued v4l2 buffer contains 4147200
  
  bytes, but 3110400 were expected. Flags: 0x00012001.
  
  Last message repeated xx times

  Output from v4l2-ctl --list-formats-ext

  ioctl: VIDIOC_ENUM_FMT
  
      Type: Video Capture
  
  
  
      [0]: 'YUYV' (YUYV 4:2:2)
  
          Size: Discrete 1920x1080
  
              Interval: Discrete 0.017s (59.940 fps)
  
      [1]: 'NV12' (Y/CbCr 4:2:0)
  
          Size: Discrete 1920x1080
  
              Interval: Discrete 0.017s (59.940 fps)
  
      [2]: 'YU12' (Planar YUV 4:2:0)
  
          Size: Discrete 1920x1080
  
              Interval: Discrete 0.017s (59.940 fps)

  Log output after ffmpeg command modification.

  Starting ffmpeg
  
  ffmpeg version N-95970-gd5274f8 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  
    configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/pi/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
    libavutil      56. 36.101 / 56. 36.101
  
    libavcodec     58. 64.101 / 58. 64.101
  
    libavformat    58. 35.101 / 58. 35.101
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 67.100 /  7. 67.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  terminated script
  
  Input #0, video4linux2,v4l2, from '/dev/video0':
  
    Duration: N/A, bitrate: 1491503 kb/s
  
      Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1920x1080, 1491503 kb/s, 59.94 fps, 59.94 tbr, 1000k tbn, 1000k tbc
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, alsa, from 'hw:1,0':
  
    Duration: N/A, bitrate: 1536 kb/s
  
      Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  [rtmp @ 0x2605cd0] Cannot open connection tcp://live.twitch.tv:1935
  
  rtmp://live.twitch.tv/app/live: Immediate exit requested
  
  Exiting normally, received signal 15.

• cv::cudacodec::VideoReader unable to Play rtsp stream

  22 février 2018, par Pawan

  System information

  • OpenCV => 3.3.0
  • Operating System / Platform => Ubuntu 16.04, x86_64
  • Compiler => gcc version 5.4.1 20160904
  • Cuda => 8.0
  • Nvidia card => GTX 1080 Ti
  • ffmpeg details
    • libavutil 55. 74.100 / 55. 74.100
    • libavcodec 57.103.100 / 57.103.100
    • libavformat 57. 77.100 / 57. 77.100
    • libavdevice 57. 7.101 / 57. 7.101
    • libavfilter 6.100.100 / 6.100.100
    • libswscale 4. 7.103 / 4. 7.103
    • libswresample 2. 8.100 / 2. 8.100

  Detailed description

  i am trying to play a rtsp stream using cudacodec::VideoReader

  Rtsp Stream Details ( from vlc )

  

  this stream plays fine in vlc and cv::VideoCapture but when i try to play it in cudacodec::VideoReader i get a error saying :

  OpenCV Error: Gpu API call (CUDA_ERROR_FILE_NOT_FOUND [Code = 301]) in CuvidVideoSource, file /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/cuvid_video_source.cpp, line 66

  OpenCV Error: Assertion failed (init_MediaStream_FFMPEG()) in FFmpegVideoSource, file /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp, line 101

  Steps to reproduce

  #include <iostream>
  
  #include "opencv2/opencv_modules.hpp"
  
  
  
  #if defined(HAVE_OPENCV_CUDACODEC)
  
  
  
  #include <opencv2></opencv2>core.hpp>
  
  #include <opencv2></opencv2>cudacodec.hpp>
  
  #include <opencv2></opencv2>highgui.hpp>
  
  
  
  int main(int argc, const char* argv[])
  
  {
  
      const std::string fname = "rtsp://admin:admin@192.168.1.13/media/video2";
  
  
  
      cv::namedWindow("GPU", cv::WINDOW_NORMAL);
  
  
  
      cv::cuda::GpuMat d_frame;
  
      cv::Ptr d_reader = cv::cudacodec::createVideoReader(fname);
  
  
  
      for (;;)
  
      {
  
  
  
          if (!d_reader->nextFrame(d_frame))
  
              break;
  
  
  
          cv::Mat frame;
  
          d_frame.download(frame);
  
          cv::imshow("GPU", frame);
  
  
  
          if (cv::waitKey(3) > 0)
  
              break;
  
      }
  
      return 0;
  
  }
  
  
  
  #else
  
  int main()
  
  {
  
      std::cout &lt;&lt; "OpenCV was built without CUDA Video decoding support\n" &lt;&lt; std::endl;
  
      return 0;
  
  }
  
  #endif
  
  </iostream>

  I tried debugging it using GDB and saw that in ffmpeg_video_source.cpp bool init_MediaStream_FFMPEG() directly returns without checking the if condition.

  GDB output

  cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource 
  
  (this=0x402a20 <_start>, fname=...) at /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp:98
  
  98      cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource(const String& fname) :
  
  (gdb) n
  
  99          stream_(0)
  
  (gdb) n
  
  101         CV_Assert( init_MediaStream_FFMPEG() );
  
  (gdb) s
  
  (anonymous namespace)::init_MediaStream_FFMPEG () at /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp:94
  
  94              return initialized;
  
  (gdb) display initialized
  
  4: initialized = false
  
  (gdb) s
  
  95          }

  UPDATE :

  I have solved the problem. solution link