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• Ffmpeg : How to fix error "Please choose an encoder manually" ?

  9 juillet 2023, par Alex

  I am trying to convert a x265 videofile to a x264 format so it can be played on a television. I am trying the following command

  


  ffmpeg -i input.mkv -f mp4 -vcodec libx264 -preset fast -profile:v main -acodec aac -map 0:0 -map 0:1 -map 0:2 test.mp4


  


  to select videos stream 0:0 for video, stream 0:1 for audio and stream 0:2 for the subtitle. However I get an error

  


  Automatic encoder selection failed Default encoder for format mp4 (codec none) is probably disabled. Please choose an encoder manually.
Error selecting an encoder


  


  How to fix this command ?

  


  P.S. I am not an expert in ffmpeg or videos conversion/formats/encodings/audio formats/subtitle formats.

  


  I found EXACTLY ONE google search result with the exact error phrase HERE. And that is not helping as I do not even understand the first sentence.

  


  Below is the output for the first three streams :

  


  Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    creation_time   : 2021-03-25T09:13:20.000000Z
    ENCODER         : Lavf58.29.100
  Duration: 00:23:57.65, start: 0.000000, bitrate: 2103 kb/s
  Stream #0:0(jpn): Video: hevc (Main 10), yuv420p10le(tv), 1920x1080, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      title           : [Judas] x265 10b
      ENCODER         : Lavc58.54.100 libx265
      BPS-eng         : 1973938
      DURATION-eng    : 00:23:55.017000000
      NUMBER_OF_FRAMES-eng: 34406
      NUMBER_OF_BYTES-eng: 354079423
      _STATISTICS_WRITING_APP-eng: mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-03-25 09:13:20
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:1(jpn): Audio: aac (LC), 44100 Hz, stereo, fltp (default)
    Metadata:
      title           : Japanese
      BPS-eng         : 128000
      DURATION-eng    : 00:23:55.086000000
      NUMBER_OF_FRAMES-eng: 61804
      NUMBER_OF_BYTES-eng: 22961378
      _STATISTICS_WRITING_APP-eng: mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-03-25 09:13:20
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
  Stream #0:2(eng): Subtitle: ass
    Metadata:
      title           : English
      BPS-eng         : 196
      DURATION-eng    : 00:23:53.580000000
      NUMBER_OF_FRAMES-eng: 478
      NUMBER_OF_BYTES-eng: 35129
      _STATISTICS_WRITING_APP-eng: mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2021-03-25 09:13:20
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES


  


  I found a related question HERE whose answer I do not fully understand. However, I tried the following command

  


  ffmpeg -i input.mkv -f mp4 -vcodec libx264 -preset fast -profile:v main -acodec aac -map 0:0 -map 0:1 -map 0:2 -c:s mov_text  test.mp4


  


  but got a new error

  


  Error initializing output stream: Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


  


  I thought I am defining an "encoder" for output stream "#0:0" (which I think is video), namely libx264. So what else to do here ?

  


  I tried -acode copy and also to use -qp 0 in the command line which all did not work.

  


• "No Output pad"error when using ffmpeg to create a subtitle overlay

  7 avril 2023, par user3324136

  I am using a Lambda function to run ffmpeg to rescale a video and then add subtitles from an .ass file.

  


  I have tried a few variations, but am continuing to get an error :
[AVFilterGraph @ 0x721bec0] No output pad can be associated to link label '2'.

  


  The code is below, with the error stemming from the line :
'[0]scale=iw/1.5:ih/1.5,setsar=1[v];[1][v]overlay=-100:320[vid][2]overlay[out]'

  


  CODE

  


      try:
        subprocess.check_call([
            '/opt/ffmpeg',
            '-i', source_file,
            '-i', padding_image_file,
            '-i', subtitles_file,    # Input caption file path
            '-filter_complex',
            '[0]scale=iw/1.5:ih/1.5,setsar=1[v];[1][v]overlay=-100:320[vid][2]overlay[out]',
            '-c:a', 'copy', '-crf', '20', '-preset', 'fast', '-movflags', '+faststart',
            '-y', output_file
    ])


  


• generate multiple qualities using "ffmpeg" [closed]

  28 septembre 2022, par zamoosh

  I'm trying to generate multiple qualities using "ffmpeg".
  
I get an answer for my question in this [link][1]

  


  Here is my code :

  


  ffmpeg -f flv -i mov_bbb.mp4 \                                            
  -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 \
  -c:v libx264 -crf 22 -c:a aac -ar 48000 \
  -filter:v:0 scale=w=480:h=360  -maxrate:v:0 600k -b:a:0 500k \
  -filter:v:1 scale=w=640:h=480  -maxrate:v:1 1500k -b:a:1 1000k \
  -filter:v:2 scale=w=1280:h=720 -maxrate:v:2 3000k -b:a:2 2000k \
  -var_stream_map "v:0,a:0,name:360p v:1,a:1,name:480p v:2,a:2,name:720p" \
  -preset fast -hls_list_size 10 -threads 0 -f hls \
  -hls_time 3 -hls_flags independent_segments \
  -master_pl_name "livestream.m3u8" \
  -y "livestream-%v.m3u8"



  


  But I get this error :

  


  Stream map '0:v:0' matches no streams.
To ignore this, add a trailing '?' to the map.