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• ffmpeg concat vidoes Could not find codec parameters for stream 1

  25 février 2017, par Moji

  I’m trying to concat 3 vidoes, each is converted to mpg beforehand, when I run the command to concat, it gives me this error (But still produces the output with no audio)

  Could not find codec parameters for stream 1 (Audio: mp2, 0 channels): unspecified frame size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize'  options
  
  Input #0, mpeg, from 'concat:intermediate1.mpg|intermediate2.mpg|intermediate3.mpg':
  
  Duration: 00:00:25.73, start: 0.540000, bitrate: 2626 kb/s
  
  Stream #0:0[0x1e0]: Video: mpeg1video, yuv420p(tv), 480x414 [SAR 1:1 DAR 80:69], 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
  Stream #0:1[0x1c0]: Audio: mp2, 0 channels
  
  [mpeg @ 0000000002766ba0] VBV buffer size not set, using default size of 130KB
  
  If you want the mpeg file to be compliant to some specification
  
  Like DVD, VCD or others, make sure you set the correct buffer size
  
  Output #0, mpeg, to 'intermediate_all.mpg':
  
  Metadata:
  
  encoder  : Lavf57.50.100
  
  Stream #0:0: Video: mpeg1video, yuv420p(tv), 480x414 [SAR 1:1 DAR 80:69], q=2-31, 104857 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mpeg @ 0000000002766ba0] Timestamps are unset in a packet for stream 0.  This is deprecated and will stop working in the future. Fix your code to set the   timestamps properly
  
  frame= 1151 fps=0.0 q=-1.0 Lsize=    7834kB time=00:00:40.81  bitrate=1572.5kbits/s speed= 346x
  
  video:7792kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.535638%

  First and third videos are made by just one picture (first one 10 second and the third 5 second long) and there is no audio for them.
  the Second video which has Audio, is converted to mpg from mov by running this command :

  -i test.mov -qscale:v 1 -y intermediate2.mpg

  And I’m using this command to merge them all together :

  -i concat:\"intermediate1.mpg|intermediate2.mpg|intermediate3.mpg\" -c copy -y intermediate_all.mpg

  the final output "intermediate_all.mpg" has no audio at all.

  I also tried putting ’analyzeduration’ and ’probesize’ to value 100M, yet didn’t work.

  Anything I’m doing wrong here ?

• FFMPEG Concat failing - System cannot find the file specified

  16 janvier 2017, par geekman

  I’m a PC. I just reversed a video, and want to combine the original file and the reversed file into one new output.mp4 file

  I’m using code copied directly from the ffmpeg wiki

  ffmpeg -i input1.mp4 -i input2.webm \
  
  -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" \
  
  -map "[v]" -map "[a]" <encoding options="options"> output.mkv
  
  </encoding>

  This is my version :

  ffmpeg -i C:\xampp\htdocs\reviews\uploads\0115171331.mp4 -i C:\xampp\htdocs\reviews\uploads\R0115171331.mp4 \
  
  -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" \
  
  -map "[v]" -map "[a]"  C:\xampp\htdocs\reviews\output.mp4

  And when I run it, it just gives me :

  The system cannot find the file specfied.

  Again, my other ffmpeg commands worked, and these files (except for output) do exist. I’ve double checked.

  Any idea what could be going wrong ?

• Using command line find to encode files and save to same directory

  15 janvier 2017, par Ali Samii

  I am trying to execute a find bash command to process hundreds of video files that are all named video-original.mp4 but are in subdirectories of a parent directory.

  Here’s an example of the directory structure :

  videos
  
  ├── 01a
  
  │   └── video-original.mp4
  
  ├── 01b
  
  │   └── video-original.mp4
  
  ├── 02a
  
  │   └── video-original.mp4
  
  ├── 02b
  
  │   └── video-original.mp4
  
  ├── 03a
  
  │   └── video-original.mp4
  
  └── 03b
  
      └── video-original.mp4

  I am using the following command :

  find ./ -name 'video-original.mp4' -exec bash -c 'ffmpeg -i "$0" -f mp4 -vcodec libx264 -preset veryslow -profile:v high -acodec aac -movflags faststart video.mp4 -hide_banner' {} \;

  The problem I am having is that it is saving the file video.mp4 in the parent videos directory, instead of in the subdirectory next to the original video-original.mp4

  Afterwards, I want to delete the file video-original.mp4. Currently, my process entails waiting for all the videos to be reencoded, and then once complete, issuing a separate command to delete the file video-original.mp4 :

  find ./ -name 'video-original.mp4' -exec bash -c 'rm -rf "$0"' {} \;

  And my final step would be to extract a screenshot of the new video.mp4 at 10 seconds and save it as thumbnail.jpg. Again, I am currently doing that as a separate step that I execute after the previous two steps are completed.

  find ./ -name 'video.mp4' -exec bash -c 'ffmpeg -i "$0" -ss 00:00:10 -vframes 1 thumbnail.jpg' {} \;

  What I would like to do is combine these three steps into a single command so the end result will be :

  videos
  
  ├── 01a
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 01b
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 02a
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 02b
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 03a
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  └── 03b
  
      ├── thumbnail.jpg
  
      └── video.mp4

  Finally, it would be great to save that as a bash script and include it in my path in /usr/local/bin or ~/bin as an executable so I could just issue the command reencode and it would run. Would be even better if the input file could have any video file, for example, random_name.mp4 or random_name.mov or random_name.webm, basically any video file (but skipping video.mp4 at the encoding step).