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  • Why does calling ffmpeg from python's popen break screen capture functionality ?

    4 mars 2016, par Jabb

    I am trying to create screen captures from mp4 files in python.
    Calling ffmpeg on the command line works fine. But as soon, as I issue the same command through python "popen", functionality breaks with an error that ffmpeg cannot find the moov atom. Can anyone explain this to me ?

    This is how I call ffmpeg from python :

    def ffmpegGetScreenshot(self,inputFilename,index,startTime):
    
    my_env = os.environ.copy()
    
    my_env.update({'PATH': '/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'})
    

    
    filename = inputFilename.split("/")[1]
    
    directory = inputFilename.split("/")[0]
    
    if os.path.isfile('videoscreenshots/'+filename+"_cs"+str(index)+".jpg"):
    
        return 'videoscreenshots/'+filename+"_cs"+str(index)+".jpg"
    
    print "get screenshots for: " + inputFilename
    
    command = [ FFMPEG_BIN,
    
                '-y', 
    
                '-i', inputFilename,
    
                '-ss', str(int(startTime)),
    
                '-vframes', '1',
    
                #'-loglevel','quiet',
    
                'videoscreenshots/'+filename+"_cs"+str(index)+".jpg"
    
                ]
    
    pipe = sp.Popen(command, env=my_env,stdin = sp.PIPE,stdout = sp.PIPE, stderr=None)
    
    print command
    

    
    return 'videoscreenshots/'+filename+"_cs"+str(index)+".jpg"

    Result :

    ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (Debian 4.9.2-10)
    
  configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libx264 --enable-libspeex --enable-shared --enable-pthreads --enable-libopenjpeg --enable-libfaac --enable-nonfree
    
  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
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x652120] moov atom not found
    
videochunks/test.mp4: Invalid data found when processing input
    
test.mp4

    This is the same command called on the console

    /usr/local/bin/ffmpeg -y -i videochunks/test.mp4 -ss 9 -vframes 1 videoscreenshots/test.mp4_cs2.jpg

    Result :

    root@3:/app# /usr/local/bin/ffmpeg -y -i videochunks/test.mp4 -ss 9 -vframes 1 videoscreenshots/test.mp4_cs2.jpg
    
ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.9.2 (Debian 4.9.2-10)
    
  configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libx264 --enable-libspeex --enable-shared --enable-pthreads --enable-libopenjpeg --enable-libfaac --enable-nonfree
    
  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
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videochunks/test.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : Test
    
    composer        : Test
    
    album           : Test
    
    encoder         : Lavf56.36.100
    
  Duration: 00:00:10.01, start: 0.000000, bitrate: 520 kb/s
    
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 4:3 DAR 16:9], 436 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 97 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
[swscaler @ 0x648260] deprecated pixel format used, make sure you did set range correctly
    
Output #0, image2, to 'videoscreenshots/test_cs2.jpg':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    title           : Test
    
    composer        : Test
    
    album           : Test
    
    encoder         : Lavf56.36.100
    
    Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 320x240 [SAR 4:3 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
      encoder         : Lavc56.41.100 mjpeg
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
    
Press [q] to stop, [?] for help
    
frame=    1 fps=0.0 q=3.9 Lsize=N/A time=00:00:00.04 bitrate=N/A
    
video:11kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  • Read Outputinformation of ffmpeg-process runned from java

    7 juillet 2015, par Sebastian Röher

    I want to read out the information about a videofile loaded with ffmpeg.
    The output in the console from ffmpeg :

    [sebastian@ULBP2681 ~]$ ffmpeg -i /mnt/Speicherschwein/workspace/testVideos/00-50-C2-1D-7F-85_005.avi
    
ffmpeg version 2.7.1 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 5.1.0 (GCC)
    
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-shared --enable-version3 --enable-x11grab
    
  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
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.100 /  1.  2.100
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, avi, from '/mnt/Speicherschwein/workspace/testVideos/00-50-C2-1D-7F-85_005.avi':
    
  Duration: 00:00:21.12, start: 0.000000, bitrate: 303 kb/s
    
    Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p, 512x512 [SAR 1:1 DAR 1:1], 268 kb/s, 50 fps, 50 tbr, 50 tbn, 50 tbc

    The Information wich I want to have in Duration.

    So now my Problem :
    I run ffmpeg via

    String command = "ffmpeg -i " + absolutePath;
    
Process processDuration = Runtime.getRuntime().exec(command);

    and i need to read out the console output (which is not printet out in console) into a Sting.

    I tried to read from the outputStream but this doesn’t seem to work eather the inputStream doesn’t work.

    Can anyone give me hint how I can read out the console-output of a process runned via java Runtime.getRuntime().exec(command); ?

  • ffmpeg determine correct codec to use

    6 janvier 2015, par nha

    I am trying to use .y4m files that I feed into Chrome for playing.
    This is the only format that I can use.

    I have a set of .y4m files that are working for my use case, taken from here.
    For example let’s say that I use the file mobile_qcif_7.5fps.y4m.

    I also have a .mp4 file (specifically the sample small.mp4 file from techslides ). I know how to convert small.mp4 to small.y4m with the following command :

    ffmpeg -y -i small.mp4 small.y4m

    I would like the resulting file to be accepted by Chrome, just like the other file.
    What options should I use (and how to find them) ?

    Additional information

    ffprobe gives :

    $ ffprobe small.y4m 
    
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
    
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
    
[yuv4mpegpipe @ 0x23160c0] Estimating duration from bitrate, this may be inaccurate
    
Input #0, yuv4mpegpipe, from 'small.y4m':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0.0: Video: rawvideo, yuv420p, 560x320, 30 fps, 30 tbr, 30 tbn, 30 tbc
    

    

    
$ ffprobe mobile_qcif_7.5fps.y4m
    
avprobe version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2007-2014 the Libav developers
    
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
    
[yuv4mpegpipe @ 0x1e080c0] max_analyze_duration reached
    
[yuv4mpegpipe @ 0x1e080c0] Estimating duration from bitrate, this may be inaccurate
    
Input #0, yuv4mpegpipe, from 'mobile_qcif_7.5fps.y4m':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0.0: Video: rawvideo, yuv420p, 176x144, PAR 128:117 DAR 1408:1053, 7.50 fps, 7.50 tbr, 7.50 tbn, 7.50 tbc

    OS : I am using ffmpeg in Ubuntu 13.10 from the default repository : I ran sudo apt-get install ffmpeg libavcodec-extra-53

    Complete console output

    $ ffmpeg -y -i small.mp4 small.y4m
    
ffmpeg version 0.8.13-6:0.8.13-0ubuntu0.13.10.1, Copyright (c) 2000-2014 the Libav developers
    
  built on Jul 15 2014 13:48:35 with gcc 4.8.1
    
*** THIS PROGRAM IS DEPRECATED ***
    
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    creation_time   : 2010-03-20 21:29:11
    
    encoder         : HandBrake 0.9.4 2009112300
    
  Duration: 00:00:05.56, start: 0.000000, bitrate: 551 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
    Stream #0.1(eng): Audio: aac, 48000 Hz, mono, s16, 83 kb/s
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
[buffer @ 0x7274e0] w:560 h:320 pixfmt:yuv420p
    
Output #0, yuv4mpegpipe, to 'small.y4m':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    creation_time   : 2010-03-20 21:29:11
    
    encoder         : Lavf53.21.1
    
    Stream #0.0(und): Video: rawvideo, yuv420p, 560x320, q=2-31, 200 kb/s, 90k tbn, 30 tbc
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press ctrl-c to stop encoding
    
frame=  166 fps=  0 q=0.0 Lsize=   43576kB time=5.53 bitrate=64513.5kbits/s    
    
video:0kB audio:0kB global headers:0kB muxing overhead inf%

    Head of the files

    Not sure if this is relevant, but the text content of both files begin like that :

    mobile_qcif_7.5fps.y4m
    
YUV4MPEG2 W176 H144 F15:2 Ip A128:117
    
FRAME
    

    
small.y4m (invalid)
    
YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
    
FRAME

    Additional experiment

    Taking the sample mobile_qcif_7.5fps.y4m, turning it into a .mp4 file and then back into a .y4m produces an invalid file (at least for Chrome).

    Answer to comments in the answer of @SirDarius

    Following the suggestion of @SirDarius ; I tried the following commands.
    They failed to produce a valid file.

    # [COMMAND]   # [RESULT] [HEADER]
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv444p -y small_yuv444p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C444 XYSCSS=444
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv422p -y small_yuv422p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C422 XYSCSS=422
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p -y small_yuv420p.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420mpeg2 XYSCSS=420MPEG2
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv411p -y small_yuv411p.y4m   # KO   YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C411 XYSCSS=411
    

    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p9 -y small_yuv420p9.y4m   # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p9 XYSCSS=420P9
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p12 -y small_yuv420p12.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p12 XYSCSS=420P12
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p14 -y small_yuv420p14.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p14 XYSCSS=420P14
    
ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -strict -1 -pix_fmt yuv420p16 -y small_yuv420p16.y4m # KO YUV4MPEG2 W560 H320 F15:2 Ip A0:0 C420p16 XYSCSS=420P16

    When trying other formats (like yuv420p12be, which was in the output of -pix_fmts), I had the following output (hence my previous trials) :

    $  ffmpeg -i small.mp4 -vf fps=7.5 -an -c:v rawvideo -f yuv4mpegpipe -pix_fmt yuv420p12be -y small_yuv420p12be.y4m 
    
ffmpeg version N-68884-g3ebd76a Copyright (c) 2000-2015 the FFmpeg developers
    
  built on Jan  6 2015 11:03:21 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu9)
    
  configuration: 
    
  libavutil      54. 16.100 / 54. 16.100
    
  libavcodec     56. 19.100 / 56. 19.100
    
  libavformat    56. 18.100 / 56. 18.100
    
  libavdevice    56.  3.100 / 56.  3.100
    
  libavfilter     5.  6.100 /  5.  6.100
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  1.100 /  1.  1.100
    
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x21d0220] overread end of atom 'colr' by 1 bytes
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    creation_time   : 2010-03-20 21:29:11
    
    encoder         : HandBrake 0.9.4 2009112300
    
  Duration: 00:00:05.57, start: 0.000000, bitrate: 551 kb/s
    
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 560x320, 465 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
      encoder         : JVT/AVC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 83 kb/s (default)
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
[yuv4mpegpipe @ 0x21d8180] ERROR: yuv4mpeg can only handle yuv444p, yuv422p, yuv420p, yuv411p and gray8 pixel formats. And using 'strict -1' also yuv444p9, yuv422p9, yuv420p9, yuv444p10, yuv422p10, yuv420p10, yuv444p12, yuv422p12, yuv420p12, yuv444p14, yuv422p14, yuv420p14, yuv444p16, yuv422p16, yuv420p16 and gray16 pixel formats. Use -pix_fmt to select one.
    
Output #0, yuv4mpegpipe, to 'small_yuv420p12be.y4m':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42isomavc1
    
    encoder         : Lavf56.18.100
    
    Stream #0:0(und): Video: rawvideo ([12][11]3Y / 0x59330B0C), yuv420p12be, 560x320, q=2-31, 200 kb/s, 7.50 fps, 7.50 tbn, 7.50 tbc (default)
    
    Metadata:
    
      creation_time   : 2010-03-20 21:29:11
    
      encoder         : Lavc56.19.100 rawvideo
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
    
Could not write header for output file #0 (incorrect codec parameters ?): Input/output error

    After that, I also tried to edit with an hexadecimal editor (bless) the small_yuv420p.y4m file. I replace C420mpeg2 by C420, and the file was accepted by Chrome.
    What does the number in 420p[number] correspond to ? It is not explained there.
    Is there any way to make ffmpeg output this kind of header files ?

    @SirDarius, thank you again for your help.

    The question

    (in case you forgot after this text blob)

    How can I convert the small.mp4 into a small.y4m file that has the same properties as the mobile_qcif_7.5fps.y4m file ?

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