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• Setting UseShellExecute = false doesn't work in Process.Start

  5 décembre 2015, par Alex Jolig

  There’s a good Q&A about hiding shell execute when running a process which led me to write my own code using ffmpeg :

  Process proc = new Process();
  
  proc.StartInfo.FileName = "ffmpeg";
  
  proc.StartInfo.Arguments = string.Format("-ss {0} -i \"{1}\" -t {2}{3} DB\\Media\\{4}{5} -y",
  
       TimeSpan.Parse(row.Cells["StartdgvList"].Value.ToString()),
  
       openFileDialog.FileName, _durationTime, quality, newTmpSound,
  
       GetExtension(openFileDialog.FileName));
  
  proc.StartInfo.RedirectStandardError = true;
  
  proc.StartInfo.UseShellExecute = false;
  
  proc.StartInfo.CreateNoWindow = true;
  
  if (!proc.Start()) return;
  
  StreamReader reader = proc.StandardError;
  
  string line;
  
  while ((line = reader.ReadLine()) != null && !_cancel)
  
  {
  
    //Doing something with process line
  
  }
  
  proc.Close();

  This works fine, But when I run it in a few user machines, it just stops working with no error.

  I tried removing lines which hides shell window and turned it to this :

  Process proc = new Process();
  
  proc.StartInfo.FileName = "ffmpeg";
  
  proc.StartInfo.Arguments = string.Format("-ss {0} -i \"{1}\" -t {2}{3} DB\\Media\\{4}{5} -y",
  
       TimeSpan.Parse(row.Cells["StartdgvList"].Value.ToString()),
  
       openFileDialog.FileName, _durationTime, quality, newTmpSound,
  
       GetExtension(openFileDialog.FileName));
  
  if (!proc.Start()) return;
  
  proc.Close();

  and it start working in all the machines.

  I’m wondering if there’s some sort of service or components missing in some machines which makes the process fails when console is hiding.

  I appreciate if anyone has any idea.

  P.S : I installed Visual Studio 2012 on a machine which has problem hiding shell window and it suddenly start working. Maybe VS2012 installed somwthing on the machine which solved the problem.

• ffmpeg process stops for no reason at random position

  29 septembre 2021, par Peter Hammi

  I have a encoding script which can re-encode/repack h264, h265, acc, ac3, mp3, flac etc. using ffmpeg version 4.4 into HLS (http-live-stream). Actually the script is working pretty awesome and I have very nice results but for some reason my conversion process breaks if it simply runs long.

  


  Basically the ffmpeg process gets executed within docker using a
simple command call like so :

  


  def exec_command(string):
    """
    Shell command interface

    Returns returnCode, stdout, stderr
    """
    log('DEBUG', f'[Command] {string}')
    output = run(string, shell=True, check=True, capture_output=True)
    return output.returncode, output.stdout, output.stderr


  


  I sadly can't get to much into detail as the code is closed source and more than 1000 lines long, anyways the string parameter that gets passed and containing the command to be executed looks like this :

  


  command += f' -map 0:{stream["index"]} {build_command_encode(stream, job["config"])} -map_metadata -1 -map_chapters -1 -f hls -hls_time 6 -hls_list_size 0 -hls_segment_filename "{path}/f-%04d.m4s" -hls_fmp4_init_filename "init-{name}.m4s" -hls_segment_type fmp4 -movflags frag_keyframe -hls_flags independent_segments "{path}/master.m3u8"'


  


  Can maybe someone imagine why the ffmpeg process break for no reason ?

  


  Thanks in advance

  


• FFMPEG "no such file or directory" on Android

  25 mars 2013, par Feras

  I am trying to use the ffmpeg binary and call it via a native linux command in android. Most of the commands work fine but the problem is that when i need to pass an http url as an input to the -i option i get "No such file or directory" for the url. The url however is existing and running the SAME command on a mac does the job as expected.

  Here is my compile config for the ffmpeg build :

  ./configure \
  
  $DEBUG_FLAG \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --target-os=linux \
  
  --enable-runtime-cpudetect \
  
  --prefix=$prefix \
  
  --enable-pic \
  
  --disable-shared \
  
  --enable-static \
  
  --cross-prefix=$NDK_TOOLCHAIN_BASE/bin/$NDK_ABI-linux-androideabi- \
  
  --sysroot="$NDK_SYSROOT" \
  
  --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-L../x264" \
  
  \
  
  --enable-version3 \
  
  --enable-gpl \
  
  \
  
  --disable-doc \
  
  --enable-yasm \
  
  \
  
  --enable-decoders \
  
  --enable-nonfree \
  
  --enable-encoders \
  
  --enable-muxers \
  
  --enable-demuxers \
  
  --enable-parsers \
  
  --enable-protocols \
  
  --enable-protocol=http \
  
  --enable-filters \
  
  --enable-avresample \
  
  \
  
  --disable-indevs \
  
  --enable-indev=lavfi \
  
  \
  
  --enable-hwaccels \
  
  \
  
  --enable-ffmpeg \
  
  --enable-ffplay \
  
  --enable-libmp3lame \
  
  --enable-network \
  
  \
  
  --enable-libx264 \
  
  --enable-libfaac \
  
  --enable-zlib

  Its based off of this project : https://github.com/guardianproject/android-ffmpeg-java

  Command is something along the lines of that :

  ffmpeg -i "http://someurl" -f mp3 -ab 192000 -vn demoo.mp3

  The idea being to download the audio track from a video and encode it as mp3. I explicitly added multiple enable protocols options but nothing seems to do the job. I tried an alternative config as well, removing everything below enable-gpl just to make sure there arent any conflicts, but it fires the same error. If i give it a normal filesystem path it works fine.

  Following the comments here is the exact output of the command and the output :

  03-25 00:22:08.806: VERBOSE/FFMPEG(16491): /data/data/org.ffmpeg.android/app_bin/ffmpeg -i "http://r6---sn-gvbxgn-tt1d.c.youtube.com/videoplayback?ipbits=8&cp=U0hVSVJLV19KUUNONV9KRUFJOnQ0STMtb0JXc0py&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&id=c0045acebe0c3341&upn=IVAGxSD1hE0&source=youtube&ratebypass=yes&mv=m&key=yt1&expire=1364209857&itag=18&ms=au&ip=99.234.119.90&mt=1364185033&fexp=923418%2C901802%2C906383%2C902000%2C919512%2C913605%2C931202%2C900821%2C900823%2C931203%2C931401%2C908529%2C919373%2C930803%2C920201%2C929602%2C930101%2C930603%2C926403%2C900824%2C910223&sver=3&newshard=yes&signature=838AEB4650D8353B70DBC49341E0C40706DC6153.297639FD70A7F9710F29AE9E278A4FC4A32E0C67" -f mp3 -ab 192000 -vn /data/data/org.ffmpeg.android/files/demoooo.mp3 -loglevel debug
  
  03-25 00:22:08.956: DEBUG/ffmpeg(16491): Process exited with code:1
  
  03-25 00:22:08.966: DEBUG/ffmpeg(16491): Shell output:ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
  03-25 00:22:08.976: DEBUG/ffmpeg(16491): Shell output:  built on Mar 24 2013 02:24:38 with gcc 4.6 20120106 (prerelease)
  
  03-25 00:22:08.976: DEBUG/ffmpeg(16491): Shell output:  configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/info.guardianproject.ffmpeg/app_opt --enable-pic --disable-shared --enable-static --cross-prefix=/Users/feribg/Dev/android-ndk-r8d/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86/bin/arm-linux-androideabi- --sysroot=/Users/feribg/Dev/android-ndk-r8d/platforms/android-3/arch-arm --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon' --extra-ldflags=-L../x264 --enable-version3 --enable-gpl
  
  03-25 00:22:08.976: DEBUG/ffmpeg(16491): Shell output:  libavutil      51. 54.100 / 51. 54.100
  
  03-25 00:22:08.976: DEBUG/ffmpeg(16491): Shell output:  libavcodec     54. 23.100 / 54. 23.100
  
  03-25 00:22:08.976: DEBUG/ffmpeg(16491): Shell output:  libavformat    54.  6.100 / 54.  6.100
  
  03-25 00:22:08.986: DEBUG/ffmpeg(16491): Shell output:  libavdevice    54.  0.100 / 54.  0.100
  
  03-25 00:22:08.996: DEBUG/ffmpeg(16491): Shell output:  libavfilter     2. 77.100 /  2. 77.100
  
  03-25 00:22:08.996: DEBUG/ffmpeg(16491): Shell output:  libswscale      2.  1.100 /  2.  1.100
  
  03-25 00:22:08.996: DEBUG/ffmpeg(16491): Shell output:  libswresample   0. 15.100 /  0. 15.100
  
  03-25 00:22:08.996: DEBUG/ffmpeg(16491): Shell output:  libpostproc    52.  0.100 / 52.  0.100
  
  03-25 00:22:08.996: DEBUG/ffmpeg(16491): Shell output:"http://r6---sn-gvbxgn-tt1d.c.youtube.com/videoplayback?ipbits=8&cp=U0hVSVJLV19KUUNONV9KRUFJOnQ0STMtb0JXc0py&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&id=c0045acebe0c3341&upn=IVAGxSD1hE0&source=youtube&ratebypass=yes&mv=m&key=yt1&expire=1364209857&itag=18&ms=au&ip=99.234.119.90&mt=1364185033&fexp=923418%2C901802%2C906383%2C902000%2C919512%2C913605%2C931202%2C900821%2C900823%2C931203%2C931401%2C908529%2C919373%2C930803%2C920201%2C929602%2C930101%2C930603%2C926403%2C900824%2C910223&sver=3&newshard=yes&signature=838AEB4650D8353B70DBC49341E0C40706DC6153.297639FD70A7F9710F29AE9E278A4FC4A32E0C67": No such file or directory