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• Ffmpeg converting to mp4 from mkv[mpeg@ 0x7f9c19800000] start time for stream 0 is not set in estimate_timings_from_pts

  6 février 2018, par croakouttatune

  I recently converted a number of anime episodes from MKV to MP4 to burn and watch on my SamsungBRPlayer, however during the process I wasn’t able to convert the subtitle stream #0:2 through ffmpeg from .ssa to .srt thru their respective codecs (SSA to MOV_TEXT, can also be SUBRIP). I eventually decided to extract the SSA files and encode them as .srt... one for each episode. I converted these to .srt and plugged them back into the 8 episodes.

  for i in *.mkv;do ffmpeg -i "$i" -i *.srt -c copy -c:s mov_text -c:v h264_videotoolbox -c:a aac -b:a 128k -target ntsc-dvd -y "yfolder/${i%.mkv*}.mp4"; done

  After testing the compatibility of these files I know that this video codec will work, and the BluRay player I use also recognizes the subtitle files ; However , when looking back at the streams #0:0 which is where the subtitles are stored gives me "[mpeg @ 0x7f8621000000] start time for stream 0 is not set in estimate_timings_from_pts." This stream #0:O is now a data stream...0:1 video 0:2 being audio ...
  One of the reasons I thought that I could have received this message is from an Attachment from the original MKV files in the #0:3 stream, which because it wasn’t anything more than metadata I ignored.
  Another would probably be from the code mentioned above importing multiple .srt files into each of the new .mp4 files. I did find a solution however I’m not able to utilize the coding.

  $ for video in *.mkv 
  
  do 
  
  base=${video%.mkv} ffmpeg -i $base.mkv -vf subtitles=$base.srt  
  
  $base-out.mkv ; done

  I couldn’t seem to get it to work. My files were as follows :

  [AnimeGT] Hansom Gold - 001 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 002 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 003 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 004 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 005 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 006 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 007 [720p] [suitup].mp4

  [AnimeGT] Hansom Gold - 008 [720p] [suitup].mp4

  So the titles are obviously fake but whatever. What I need to know is how to use the ${I%.*}.mp4 and ${h%.*}.srt to represent both the base and the video variables in the coding I failed at above.
  While keeping the data stream from each file.
  if that’s the problem. Some help would be nice.

  [mpeg @ 0x7f9c19800000] start time for stream 0 is not set in estimate_timings_from_pts

  I need to know how to deal with this.

• Horizontally show two videos side by side and export to one video

  15 juin 2015, par Michael Liberman

  What I am trying to achieve :
  Programmatically (using some kind of script) combine two different videos to one video where the videos are shown side by side and sound from both videos is played simultaneously.

  I found at least two ways I could display two videos side by side but in each one I have a different problem that makes it difficult to complete the process :

  1. Avisyth and Avs2Avi :
     Avisyth really makes the process easy. With a simple Avisyth script like this you should be able to play two videos side by side :

     video1=AVISource("d:\file1.avi")<br />
video2=AVISource("d:\file2.avi")<br />
StackHorizontal(video1,video2)

     The creation of a new output file can be done with avs2avi.
     The problem here is that i am not able to play even one avi file with avisyth because I get "AviSource couldn’t locate a decompressor for fourcc xvid" message. I googled for the solutions to that problem but nothing helped. GSpot says that i have all the codecs needed and it seems I can not do anything. Because I can not get to running real videos, I dont know if the final video plays sounds from both videos. Avisyth installed correctly and I am able to run the following script StackHorizontal(version ,version).

  2. ffmpeg
     Works like a charm with two videos and the final file BUT i do not get the sounds from both videos but only the first one. I found out that the solution to add sound from the second video will be by using the libfaac in the command line, like that :
     

     ffmpeg.exe -i video1.mp4 -vf "[in] scale=iw/2:ih/2, pad=2*iw:ih [left]; movie=video2.mp4, scale=iw/3:ih/3 [right]; [left][right] overlay=main_w/2:0 [out]" -c:a libfaac -b:v 768k Output.mp4

  but i always get an error that the encoder libfaac can not be found. I downloaded the libfaac.dll but still no result.

  Is there a solution to any of these problems ? Is there another way to programmatically make one video from two videos that are played side by side ? Thanks in advance.

• add watermark and merge videos programmatically [on hold]

  14 septembre 2017, par Suriya Rakhunathan

  I am working on a node js project where i need to combine multiple videos to a single file and add watermark to the final video. I have tried using ffmpeg to achieve this functionality. But still facing some issues.

  Is it possible if any type of video formats like mp4, mpeg, avi to be handled ?

  Can this be achieved completely using node js or equivalent frameworks or should I use other languages like java, python..

  Please help me if any one have worked on such scenarios earlier and have some idea on this. I will post my current research status and points as i progress.

   Suriya