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• How to tell if ffmpeg errored or not ?

  12 juin 2015, par dvdmn

  The Situation :
  I’m using ffmpeg (via .net) to save video files. I can get the output from ffmpeg but I dont know how can I customize the output to have better result.

  My Problem :
  My problem is, there is no certain difference between successful and failed operation.

  last line of success :

  video:1006kB audio:134kB subtitle:0 global headers:0kB muxing overhead 0.943510%

  last lines from fails

  c :\x\test-9-8/30/2012-9:29:56-AM.mp4 : Invalid argument

  rtmp ://cdn.tv/cdn-live39/definst/stream01 : Unknown error occurred

  My Question :
  Is there an option (or command line parameter) to add some sort of return code (200 : success, 500 : error, etc)

  Thanks !

  PS : I saw this topic How to tell if ffmpeg errored ? but there is no number before/after last line. I think the last version doesnt have number anymore.

• "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%

• Grayscale streaming from raw video using FFMPEG

  21 janvier 2015, par user1657208

  I have a raw video file (testvideo_1000f.raw) that I am trying to stream in gray scale using ffmpeg and output the grayscale video to output.swf. The command I am using to do this is :

  ffmpeg/ffmpeg -qmin 2 -qmax 31 -s 320x240 -f rawvideo -flags gray -pix_fmt:output gray -an -i testvideo_1000f.raw output.swf

  However, the result from this command is a video stream that is in gray scale but still contains some of the chrominance data. The output from this command is pasted below :

      3 [volta]/home/student/elliott> ffmpeg/ffmpeg -qmin 2 -qmax 31 -s 320x240 -f rawvideo -flags gray -pix_fmt:output gray -an -i testvideo_1000f.raw output.swf
  
  ffmpeg version N-41632-g2b1fc56 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jul 29 2012 10:27:26 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  
    configuration: 
  
    libavutil      51. 58.100 / 51. 58.100
  
    libavcodec     54. 25.100 / 54. 25.100
  
    libavformat    54.  6.101 / 54.  6.101
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 80.100 /  2. 80.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
  *** CHOOSING 8
  
  [rawvideo @ 0xdda9660] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rawvideo, from 'testvideo_1000f.raw':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
     Stream #0:0: Video: rawvideo (Y800 / 0x30303859), gray, 320x240, 25 tbr, 25 tbn, 25 tbc
  
  File 'output.swf' already exists. Overwrite ? [y/N] y
  
  w:320 h:240 pixfmt:gray tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
  
  [ffmpeg_buffersink @ 0xddb7b40] No opaque field provided
  
  [format @ 0xddb7d40] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [auto-inserted scaler 0 @ 0xddb7920] w:320 h:240 fmt:gray sar:0/1 -> w:320 h:240 fmt:yuv420p sar:0/1 flags:0x4
  
  *** CHOOSING 8
  
  Output #0, swf, to 'output.swf':
  
    Metadata:
  
      encoder         : Lavf54.6.101
  
     Stream #0:0: Video: flv1, yuv420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> flv)
  
  Press [q] to stop, [?] for help
  
  Truncating packet of size 76800 to 1 2875kB time=00:00:40.84 bitrate= 576.7kbits/s    
  
  frame= 1500 fps=1035 q=24.8 Lsize=    4194kB time=00:01:00.00 bitrate= 572.6kbits/s    
  
  video:4166kB audio:0kB global headers:0kB muxing overhead 0.669245%

  I am fairly new to FFMPEG and I am afraid I am using either the wrong syntax or the wrong parameters in my command line. For some reason, the format of the output is yuv420p. I have tried searching for this answer all over but have had no luck. Could anyone please help me and tell me why the output is being formatted in yuv420p when I am giving the command for it to be in 8bit grayscale ? Any help would be greatly appreciated. Thank you.

  Marc Elliott