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• How to initialize the AV format context from NetworkStream rather than url ?

  23 juillet 2020, par Ahmad

  I'm using FFmpeg.AutoGen to encode catpured frames :
https://github.com/Ruslan-B/FFmpeg.AutoGen

  


  I send the encoded packets through NetworkStream to another program using TCP Client/Server application, using this code :

  


   //Send size and encoded packet
 _stream.Write(BitConverter.GetBytes(pPacket->size), 0, 4);
 using (var packetStream = new UnmanagedMemoryStream(pPacket->data, pPacket->size)) 
        packetStream.CopyTo(_stream);


  


  At the server-side, after UTF8 encoding, I receive content like this :

  


  


  gd ?r@ ?/ ?a 2&#xF;1 ?   h?C?,?  ????E???H??,? ?#??x264 - core 160 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=11 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 ?  e??   ??S?T????M?.O ??Ea???Q?OI??X?????[?P???42=h??M?K? ??{?@c;?t???Ke?>???? ?2 ??&#xB; ?\qXEvg ???U A ?X ??q/&#xB;(?? ?L ?_c ?g ?X ?c(To ?k ?Y ?-F ???R ?] ??U ?&#xA; ;|=r ????\U ???2 ?g ??> ??½ ?7 ?A&#xE; ?1W9 ???A ??&#xF; ?_L ??P ?) ?&#xF;M ????q/ ?L ??) : ??< ??8d/* ?&#xF; ?^ ??} ?B ?H ?_8C[y ???CY ?QM(J ???1<3% ?K ?F ;Q3Q ????&#xA; ??jy&#xF;J" ???y]k ?m ?^} ???S ????h ?&#xF;3 ????EP ???pw ???q ?jKp ???h ?????

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  My problem is, how to initialize the AV format context with this data, and decode the received packet to recover the original frame ?

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  _pFormatContext = ffmpeg.avformat_alloc_context();
ffmpeg.avformat_open_input(&pFormatContext, url, null, null).ThrowExceptionIfError();


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  As problem exactly is, ffmpeg.avformat_open_input takes URL as an input, not byte[]. If _pFormatContext can be initialized using the received data, things are resolved, but HOW ?

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• Unable to find a suitable output format for 'ffmpeg' I/flutter (29205) : ffmpeg : Invalid argument

  24 juillet 2020, par Abhijit Rajmane

  I'm trying to mix two audio files using flutter_ffmpeg : 0.2.10 but I get

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  [NULL @ 0xd77d4400] Unable to find a suitable output format for 'ffmpeg'
I/flutter (29205): ffmpeg: Invalid argument

code : 
String file1= _localPath+"/file1.m4a";
String file2= _localPath+"/file2.mp3";
String output= _localPath+"/abhijit.wav";

String finalPath= "ffmpeg -i "+ file1 +" -i "+file2+" -filter_complex amix=inputs=2:duration=first:dropout_transition=0 "+output;

console ffmpeg's message...
I/flutter (29205):   libavutil      56. 38.100 / 56. 38.100
I/flutter (29205):   libavcodec     58. 65.102 / 58. 65.102
I/flutter (29205):   libavformat    58. 35.101 / 58. 35.101
I/flutter (29205):   libavdevice    58.  9.103 / 58.  9.103
I/flutter (29205):   libavfilter     7. 70.101 /  7. 70.101
I/flutter (29205):   libswscale      5.  6.100 /  5.  6.100
I/flutter (29205):   libswresample   3.  6.100 /  3.  6.100
I/flutter (29205): Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Android/data/com.arthenica.flutter.ffmpeg.FlutterFFmpegExample/files/Download/file1.m4a':
I/flutter (29205):   Metadata:
I/flutter (29205):     major_brand     : mp42
I/flutter (29205):     minor_version   : 1
I/flutter (29205):     compatible_brands: isommp41mp42
I/flutter (29205):     creation_time   : 2020-07-09T15:42:47.000000Z
I/flutter (29205):   Duration: 00:12:12.26, start: 0.000000, bitrate: 61 kb/s
I/flutter (29205):     Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 60 kb/s (default)
I/flutter (29205):     Metadata:
I/flutter (29205):       creation_time   : 2020-07-09T15:42:47.000000Z
I/flutter (29205):       handler_name    : Core Media Audio
I/flutter (29205): Input #1, mp3, from '/storage/emulated/0/Android/data/com.arthenica.flutter.ffmpeg.FlutterFFmpegExample/files/Download/file2.mp3':
I/flutter (29205):   Metadata:
I/flutter (29205):     artist          : SoundHelix
I/flutter (29205):     genre           : Techno
I/flutter (29205):     encoder         : Lavf58.20.100
I/flutter (29205):   Duration: 00:00:23.12, start: 0.011995, bitrate: 192 kb/s
I/flutter (29205):     Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
I/flutter (29205):     Metadata:
I/flutter (29205):       encoder         : Lavf
I/flutter (29205): [NULL @ 0xd77d4400] Unable to find a suitable output format for 'ffmpeg'
I/flutter (29205): ffmpeg: Invalid argument
I/flutter (29205): "
I/flutter (29205): New FFmpeg pipe: /data/user/0/com.arthenica.flutter.ffmpeg.FlutterFFmpegExample/cache/mf_pipe_7
I/flutter (29205): FFmpeg process exited with rc 1


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  Please check command of FFmpeg and suggest me if any correction occur, Unable to find a suitable output format for 'ffmpeg' I/flutter (29205) : ffmpeg : Invalid argument&#xA;I have no idea about this error please help me

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• Why is my discord.py bot not having voice while being hosted on Heroku ?

  24 juillet 2020, par Flying Thunder

  My bot is all set up and running, everything works, EXCEPT for voice : He joins the channel, but doesnt play audio. I have heard many different claims for what the reason is (no permission to use ffmpeg.exe, missing buildpack, missing dependency, Heroku blocking UDP on free users...) - but i hope that someone here ACTUALLY knows what the problem is, because i couldnt find any definitive reason online.

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  This is the code of the bot : https://github.com/FlyingThunder/DiscordBot/blob/master/main.py&#xA;Everything is working fine on my machine.&#xA;This is the only error that Heroku logs gave me :&#xA;2020-07-24T06:28:30.329937+00:00 app[worker.1]: PermissionError: [Errno 13] Permission denied: 'res/ffmpeg.exe'

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  I already tried adding https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest.git to my buildpacks, and i added cffi==1.14.0 to my requirements.txt - both solutions that are supposed to fix this exact issue.

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