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• Package Hs-FFmpeg won't compile

  28 décembre 2014, par changeyourstrings

  I guess, I’m another victim of cabal hell.

  I am trying to install the Haskell FFmpeg Bindings via the according cabal query using GHC-7.8.3 on OS X 10.9 :

  cabal install hs-ffmpeg

  After getting all the necessary libraries (like libdc1394, libvorbis,..) and includes usable via pkg-config, I thought I would finally come to compiling the sources.

  The latest Hs-FFmpeg package from Hackage (v.0.3.4) has a upper bound concerning the version of the haskell base lib, demanding a version less than 4.
  I failed in trying to install two separate versions of base using cabal sandboxes.

  Then I read that patching the hs-ffmpeg’s cabal file might work. So I changed the upper bound for base from versions <4 to <5.

  After doing so, the cabal configure works nice and smooth, cause I silenced the base constraint part.

  I found another resource, that says a source patch would be necessary for a working hs-ffmpeg with Ghc 7. The patch seems to change some pointer types in a source file of the packing, nothing really exciting.

  After all that, I am trying to compile again, getting the following type errors :

  cabal install
  
  Resolving dependencies...
  
  Configuring hs-ffmpeg-0.3.4.1...
  
  Building hs-ffmpeg-0.3.4.1...
  
  Failed to install hs-ffmpeg-0.3.4.1
  
  Last 10 lines of the build log ( /Users/helgetur/.cabal/logs/hs-ffmpeg-0.3.4.1.log ):
  
  Codec.hsc:147:20: note: forward declaration of 'enum CodecID'
  
      hsc_type (enum CodecID);
  
                     ^
  
  /Library/Frameworks/GHC.framework/Versions/7.8.3-x86_64/usr/lib/ghc-7.8.3/template-hsc.h:60:10: note: expanded from macro 'hsc_type'
  
      if ((t)(int)(t)1.4 == (t)1.4)                          \

  Maybe one must strictly use the ffmpeg’s demanded base version ? How can I find the problem ?

  I am running out of ideas now, moreover there are almost no similar questions out there.

• Python - FFMPEG - Test to see if video file contains DTS audio

  21 décembre 2014, par user3590149

  I’m currently running a script on cron job to convert any video files to .mp4 from .mkv. I use FFMPEG and python 2.7 to accomplish this on FreeBSD and do a native copy for both audio and video which means I leave whatever encoding they use but convert the container mkv to mp4 for DLNA because of compatibility issues for some devices. Some files contain DTS and I want to convert those audio file to AAC/AC3. I only want to convert and trans code audio to AAC/AC3 only if the file has only single audio of DTS. Some files do have DTS and AAC so I would only want to remove the DTS and not trans code in those cases. Is there way I can test a video file and see it if contains a DTS ? Any software I can use like FFMPEG or handbrake ? How would you go about do this ? I’m trying to not lose any quality.

  Psuede Code :

  If file contains DTS:
  
      If file only has single audio track:
  
          convert_to_mp4_AAC_5.1()
  
      else:
  
          remove_DTS(file)
  
          convert_native()
  
  else:
  
      convert_native()

• ffmpeg rtmp and local file output

  19 mai 2016, par user3922282

  I’m new in stackoverflow =)
  I have a trouble with ffmpeg
  I receive a rtsp stream from a grabbing device (camera) and I stream-out it to rtmp (Youtube Live)
  I want to have a copy of the stream in my computer so I write at the same time in a local file

  I use this command :

  ffmpeg -y -i ’RTSP_SOURCE’ -c:v copy -c:a libvo_aacenc -map 0:v -bsf:v
  dump_extra -fflags +genpts -flags +global_header -movflags +faststart
  -map_metadata 0 -metadata title= -f tee -filter_complex aevalsrc=0 ’[f=mp4]/tmp/backup.mp4|[f=mpegts]/tmp/backup.ts|[f=flv]rtmp ://a.rtmp.youtube.com/live2/STREAM_ID’

  The problem is when I have some disconnections, ffmpeg exits and stop to recording
  Is there any flag or option for telling to ffmpeg to continue recording in local files even there is not internet ?

  Thank you very much for your help =)