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• Covert a file from mp4 to a file that HTML video tag can display

  26 juin 2019, par Trying_To_Understand

  I have a mp4 file and I want to display it in HTML. The problem is that it won’t, not only in HTML but also in my player. In VLC I can watch the video but there is no sound. Maybe the file is corrupted ?
  This is the output when I run ffmpeg -i my_file.mp4 :

  [h264 @ 000001b4afc61880] decode_slice_header error
  
  [h264 @ 000001b4afc61880] no frame!
  
  [h264 @ 000001b4afc61880] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 000001b4afc61880] decode_slice_header error
  
  [h264 @ 000001b4afc61880] no frame!
  
  Input #0, mpeg, from '150_2.mp4':
  
    Duration: 00:50:51.75, start: 13182.386222, bitrate: 983 kb/s
  
      Stream #0:0[0x1e0]: Video: h264 (High), yuv420p(progressive), 1280x720, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x1c0]: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
  
  At least one output file must be specified.

  Can I convert this with ffmpeg to a good quality of video and audio ?

• How to add delay to only one audio file in an mp4 file containing many language sounds with ffmpeg ?

  10 décembre 2023, par Mesut

  I have an mp4 movie file. It contains audio files of two different languages. Audio #0 and Audio #1. The codec of both sounds is AAC. Now I only want to give 2000ms delay to Audio #1 audio file. I do this with ffmpeg and add the delay successfully, the command I give below adds delay to both sounds. I only want to delay Audio #1. After doing this, I want to get an output containing all sounds and subtitles without re-encoding. I just couldn't achieve this. Does anyone know how I can do this ?

  


  ffmpeg -i "input_movie.mp4" -itsoffset 2000ms -i "input_movie.mp4" -map 1:v -map 0:a -map 0:s -c copy "Output_movie.mp4"
This command adds delay to all streams, I don't want that.

  


  ffmpeg -i "input_movie.mp4" -itsoffset 2000ms -i "input_movie.mp4" -map 1:v -map 0:a:1 -map 0:s -c copy "Output_movie.mp4"
In the command line above, this time it adds delay only to audio file #1, but this time it does not include other audio files in the output mp4 file.

  


• Can´t convert .mp4 file to .mjpeg file with ffmpeg

  19 février 2018, par Herr HupfDohle

  I use ffmpeg to convert a .mp4 file to a .mjpeg file and I fail doing so.
  What i tried so far :
  Converting directly from .mp4 to .mjpeg with one of these :

      "ffmpeg -i input.mp4 output.mjpeg"
  
      "ffmpeg -i input.mp4 -framerate 25 output.mjpeg"

  Getting all the individual images of my video (which worked fine) and put them together to a .mjpeg file did not work as well.

      "ffmpeg -i input.mp4 image%d.jpeg"
  
      "ffmpeg -f image2 -i image%d.jpeg output.mjpeg", or
  
      "ffmpeg -f image2 -i image%d.jpeg -framerate 25 output.mjpeg"

  "Solutions" like the following one did not work, cause I need a file extension .mjpeg so -c:v mjpeg is not enough cause I end up with sth. like .mov !

  "ffmpeg -i input.mov -c:v mjpeg -q:v 3 -huffman optimal -an output.mov"

  To view my files I use vlc player.

  I always end up with a .mjpeg file which has the length of 10 seconds and only shows the very first image of my 4000 pictures.