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• flutter-ffmpeg error on mixing audio and picture - Unable to find a suitable output format for 'ffmpeg

  18 juillet 2021, par tylyo

  I'm trying to mix an audio and a picture in order to have a video with the same length of the Audio and as content an image sequence of the source picture.

  


  I tried using the flutter-ffmpeg plugin with the command :

  


  ffmpeg command: ffmpeg -loop 1 -i '/data/user/0/com.attiliopatania.apshare/cache/file_picker/20210402_112326.jpg' -i '/data/user/0/com.attiliopatania.apshare/cache/file_picker/Voice001.m4a' -c:v mpeg4 -tune stillimage -c:a copy -shortest /data/user/0/com.attiliopatania.apshare/app_flutter/out.mp4


  


  some context :

  


  I did the same test with ffmpeg on my pc and it worked as expected. I liked it.

  


  I did some test and I tried to write a file on the same path where the out file should be and It worked as expected : file created

  


  Running the same command through flutter plugin I experienced an error I'm reporting below

  


  ...
I/flutter (14564): Finished splitting the commandline.
I/flutter (14564): Opening an input file: /data/user/0/com.attiliopatania.apshare/cache/file_picker/Voice001.m4a.
I/flutter (14564): [NULL @ 0x731deba400] Opening '/data/user/0/com.attiliopatania.apshare/cache/file_picker/Voice001.m4a' for reading
I/flutter (14564): [file @ 0x72f6059a40] Setting default whitelist 'file,crypto,data'
I/flutter (14564): [mov,mp4,m4a,3gp,3g2,mj2 @ 0x731deba400] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
I/flutter (14564): [mov,mp4,m4a,3gp,3g2,mj2 @ 0x731deba400] ISO: File Type Major Brand: 3gp4
I/flutter (14564): [mov,mp4,m4a,3gp,3g2,mj2 @ 0x731deba400] Unknown dref type 0x206c7275 size 12
I/flutter (14564): [mov,mp4,m4a,3gp,3g2,mj2 @ 0x731deba400] Before avformat_find_stream_info() pos: 112552 bytes read:65747 seeks:1 nb_streams:1
I/flutter (14564): [mov,mp4,m4a,3gp,3g2,mj2 @ 0x731deba400] All info found
I/flutter (14564): [mov,mp4,m4a,3gp,3g2,mj2 @ 0x731deba400] After avformat_find_stream_info() pos: 403 bytes read:98515 seeks:2 frames:1
I/flutter (14564): Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.attiliopatania.apshare/cache/file_picker/Voice001.m4a':
I/flutter (14564):   Metadata:
I/flutter (14564):     major_brand     :
I/flutter (14564): 3gp4
I/flutter (14564):
I/flutter (14564):     minor_version   :
I/flutter (14564): 0
I/flutter (14564):
I/flutter (14564):     compatible_brands:
I/flutter (14564): isom3gp4
I/flutter (14564):
I/flutter (14564):     creation_time   :
I/flutter (14564): 2021-03-06T16:02:37.000000Z
I/flutter (14564):
I/flutter (14564):     com.android.version:
I/flutter (14564): 10
I/flutter (14564):
I/flutter (14564):   Duration:
I/flutter (14564): 00:00:04.97
I/flutter (14564): , start:
I/flutter (14564): 0.000000
I/flutter (14564): , bitrate:
I/flutter (14564): 181 kb/s
I/flutter (14564):
I/flutter (14564):     Stream #1:0
I/flutter (14564): (eng)
I/flutter (14564): , 1, 1/44100
I/flutter (14564): : Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 128 kb/s
I/flutter (14564):  (default)
I/flutter (14564):
I/flutter (14564): ffmpeg out 1
I/flutter (14564):     Metadata:
I/flutter (14564):       creation_time   :
I/flutter (14564): 2021-03-06T16:02:37.000000Z
I/flutter (14564):
I/flutter (14564):       handler_name    :
I/flutter (14564): SoundHandle
I/flutter (14564):
I/flutter (14564): Successfully opened the file.
I/flutter (14564): Parsing a group of options: output url ffmpeg.
I/flutter (14564): Successfully parsed a group of options.
I/flutter (14564): Opening an output file: ffmpeg.
I/flutter (14564): [NULL @ 0x7306b86c00] Unable to find a suitable output format for 'ffmpeg'
I/flutter (14564): ffmpeg: Invalid argument


  


• ffmpeg Disable default subtitle

  23 juin 2021, par Marco999

  I have many mkv files where I need to choose the audio / subtitle streams and set the favorite as default :

  


  ffmpeg.exe -y -i originale_ridotto.mkv -map 0:0 -map 0:1 -map 0:2 -map 0:5 -disposition:a:1 -default-forced -disposition:a:0 +default+forced -disposition:s -default -c copy prova.mkv


  


  With this command I can choose the audio track that I like and make the first audio as default and work for audio but not work for subtitles

  


  I have tried :

  


  -disposition:s -default
-disposition:s:0 -default
-default_mode infer_no_subs


  


  but in all case the stream 5 (subtitle) is always default. I like to copy multiple subtitles and remove all default.

  


  Text
ID                                       : 4
ID in the original source medium         : 4613 (0x1205)
Format                                   : PGS
Codec ID                                 : S_HDMV/PGS
Codec ID/Info                            : Picture based subtitle format used on BDs/HD-DVDs
Duration                                 : 3 min 16 s
Bit rate                                 : 38.8 kb/s
Count of elements                        : 2306
Stream size                              : 25.0 MiB (4%)
Language                                 : Italian
Default                                  : Yes
Forced                                   : No
Original source medium                   : Blu-ray


  


  Thare is a way to disable all subtitles ?

  


  Thank you !!

  


• Change the default audio and video codec loaded by avformat_alloc_output_context2

  8 juin 2021, par mythili3093

  I'm using ffmpeg library for live streaming via RTMP. I want to know how to give my choice of audio and video codec for the particular format in avformat_alloc_output_context2.

  


  In Detail :

  


  The following command works perfectly for me.

  


  ffmpeg -re -stream_loop -1 -i ~/Downloads/Microsoft_Surface.mp4 -vcodec copy -c:a aac -b:a 160k -ar 44100 -strict -2 -f flv -flvflags no_duration_filesize rtmp://192.168.1.7/live/surface


  


  In the output, I have set my audio codec to be aac and copied the video codec from input, which is H264.
I want to emulate this in the library, but don't know how to.

  


  avformat_alloc_output_context2(&_ctx, NULL, "flv", NULL);


  


  Above code sets oformat audio codec to ADPCM_SWF and video codec to FLV1. How to change that to AAC and H264 ?

  


  So far, used av_guess_format to construct AVOutputFormat. It accepts only format as input. And I don't know where to mention audio and video codec.

  


  AVOutputFormat* output_format = av_guess_format("flv", NULL, NULL);


  


  Also tried giving filename to avformat_alloc_output_context2 with the rest of the parameters NULL.

  


  AVOutputFormat* output_format = av_guess_format(NULL, "flv_acc_sample.flv", NULL);


  


  This file has AAC audio and H264 video. But still ffmpeg loads oformat with ADPCM_SWF audio and FLV1 video codecs.

  


  Searched stackoverflow for similar questions, but could not find the solution I was looking for.
Any hint/guidance is hugely appreciated. Thank you.