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• FFMPEG — Error when trying to concat multiple files with and without audio

  7 août 2020, par Philban

  Ok so thanks to a fellow user I have the following FFMPEG command that concats 4 videos together. Now if I use this command with 4 video files that all have audio everything works ! However, if 1 or more of the videos do not have sound I get a "matches no streams" error.

  


  Can someone spot whats wrong here please ?

  


  Video Input 1 - No Audio so adding the anullsrc
Video 2 - Has Audio
Video 3 - No Audio
Video 4 - Has Audio

  


  ffmpeg -i noSound1.mp4 -i story1.mp4 -i noSound2.mp4 -i story2.mp4 -t 0.1 -f lavfi -i anullsrc=channel_layout=stereo -filter_complex 
"[0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v0]; 
 [1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v1]; 
 [2:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v2]; 
 [3:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v3]; 
 [0:a]aformat=sample_rates=48000:channel_layouts=stereo[a0]; 
 [1:a]aformat=sample_rates=48000:channel_layouts=stereo[a1]; 
 [2:a]aformat=sample_rates=48000:channel_layouts=stereo[a2]; 
 [3:a]aformat=sample_rates=48000:channel_layouts=stereo[a3]; 
 [v0][a0][v1][a1][v2][a2][v3][a3]concat=n=4:v=1:a=1[v][a]" 
-map "[v]" -map "[a]" -c:v libx264 -c:a aac -movflags +faststart testOutput.mp4


  


  Here is the error :

  


  Stream specifier ':a' in filtergraph description [0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v0];  [1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v1];  [2:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v2];  [3:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=30,format=yuv420p[v3];  [0:a]aformat=sample_rates=48000:channel_layouts=stereo[a0];  [1:a]aformat=sample_rates=48000:channel_layouts=stereo[a1];  [2:a]aformat=sample_rates=48000:channel_layouts=stereo[a2];  [3:a]aformat=sample_rates=48000:channel_layouts=stereo[a3];  [v0][a0][v1][a1][v2][a2][v3][a3]concat=n=4:v=1:a=1[v][a] matches no streams.


  


  Now a slightly separate question. If I have N input videos where i do not know if they have sound or not, is there a way I can have a loop that does the above without having massive amounts of command lines ?
Many thanks !

  


• ffmpeg : concat videos with different number of streams

  3 juillet 2021, par qurban

  I'm having trouble with concatenating two videos with different number of streams. Please see the number of streams in both the videos below :

  


  video 1 :

  


    Metadata:
    creation_time   : 2021-07-02T10:23:13.000000Z
  Duration: 00:00:08.38, start: 0.000000, bitrate: 24739 kb/s
    Stream #0:0(eng): Video: mjpeg (Baseline) (jpeg / 0x6765706A), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 24736 kb/s, 24 fps, 24 tbr, 2400 tbn, 2400 tbc (default)
    Metadata:
      creation_time   : 2021-07-02T10:23:13.000000Z
      handler_name    : Libquicktime Video Media Handler
      encoder         : libquicktime-1.1.1
      timecode        : 00:00:30:15
    Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-07-02T10:23:13.000000Z
      handler_name    : Libquicktime Time Code Media Handler
      reel_name       : Untitled
      timecode        : 00:00:30:15


  


  Video 2 :

  


  Metadata:
    creation_time   : 2021-07-02T10:23:28.000000Z
  Duration: 00:00:08.33, start: 0.000000, bitrate: 26411 kb/s
    Stream #0:0(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2021-07-02T10:23:28.000000Z
      handler_name    : Libquicktime Sound Media Handler
    Stream #0:1(eng): Video: mjpeg (Baseline) (jpeg / 0x6765706A), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 24872 kb/s, 24 fps, 24 tbr, 2400 tbn, 2400 tbc (default)
    Metadata:
      creation_time   : 2021-07-02T10:23:28.000000Z
      handler_name    : Libquicktime Video Media Handler
      encoder         : libquicktime-1.1.1
      timecode        : 00:00:39:00
    Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-07-02T10:23:28.000000Z
      handler_name    : Libquicktime Time Code Media Handler
      reel_name       : Untitled
      timecode        : 00:00:39:00


  


  So, clearly the video 1 has two streams and video 2 has three streams. Could someone please let me know how can I concatenate them ?

  


  I have tried :
ffmpeg -y -f concat -safe 0 -i /path/to/files.txt -codec copy /path/to/output.mov

  


  But it gives the following error :

  


  [concat @ 0x12dfd00] Could not find codec parameters for stream 1 (Unknown: none): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, concat, from '/path/to/files.txt':
  Duration: N/A, start: 0.000000, bitrate: 24736 kb/s
    Stream #0:0(eng): Video: mjpeg (Baseline) (jpeg / 0x6765706A), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], 24736 kb/s, 24 fps, 24 tbr, 2400 tbn, 2400 tbc
    Metadata:
      creation_time   : 2021-07-02T10:23:13.000000Z
      handler_name    : Libquicktime Video Media Handler
      encoder         : libquicktime-1.1.1
      timecode        : 00:00:30:15
    Stream #0:1: Unknown: none
Output #0, mov, to '/path/to/output.mov':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0(eng): Video: mjpeg (Baseline) (jpeg / 0x6765706A), yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 24736 kb/s, 0.04 fps, 24 tbr, 19200 tbn, 2400 tbc
    Metadata:
      creation_time   : 2021-07-02T10:23:13.000000Z
      handler_name    : Libquicktime Video Media Handler
      encoder         : libquicktime-1.1.1
      timecode        : 00:00:30:15
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[concat @ 0x12dfd00] New (null) stream 0:2 at pos:27508735 and DTS:0.223333s
frame=  601 fps=0.0 q=-1.0 Lsize=   26856kB time=00:05:33.90 bitrate= 658.9kbits/s speed=1.07e+04x    
video:26852kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.015271%


  


  In my situation, sometimes the videos have same number of streams and sometimes different number of streams (with only video stream or with both video and audio streams). Ideally, I'm looking for an ffmpeg command which works in both situations. Is it possible ?

  


• FFMPEG segmented radio stream shows incorrect duration after a concat

  27 juillet 2021, par darbid

  On MacOS using Automator I am recording a radio stream. I thought the best way to do this so as to avoid an internet drop out was to segment it as follows.

  


  /opt/homebrew/Cellar/ffmpeg/4.4_2/bin/ffmpeg -i http://s2.viastreaming.net:7100 -t 02:10:00 -c copy -f segment -segment_time 1800 -segment_list /Volumes/BackUp/Radio/segmentlist.txt -segment_list_entry_prefix "file /Volumes/BackUp/Radio/" /Volumes/BackUp/Radio/Segments_%d.m4a


  


  I then bring it all together with the following command.

  


  /opt/homebrew/Cellar/ffmpeg/4.4_2/bin/ffmpeg -f concat -safe 0 -i /Volumes/BackUp/Radio/segmentlist.txt -c copy /Volumes/BackUp/Radio/capture.m4a


  


  Looking at the get info of the capture.m4a file it shows a duration of 2 hours 10 minutes, however, when I play it in for example iTunes it shows exactly 5:10. It also shows 5:10 for example in Emby (a local media server solution).

  


  Can someone please point me in the right direction on fixing my ffmpeg commands ?