Recherche avancée

Sur d’autres sites (4996)

• converting .mov file to .h264 file

  29 août 2011, par Robin Rye

  ok, this is the case, i actually want to parse frames from a mov file. get the encoded h264 frames. and i've managed to do so by using ffmpeg but when i try to make a movie again by using ffmpeg -i test* test.mov i get test00: Invalid data found when processing input so there is something not correct with the structure of the frames. as i understand it a frame should have the following appearance :

  00 00 00 01 XX data -------------

  where XX is say whether it is a I-,P- or B-frame. or more specifically type(XX) = 0x0F && XX says if it is I(type(XX) = 5 ?),P(type(XX) = 7 ?) or B(type(XX) = 8 ?) frame. I'm not sure about these number, i've been looking for it but not found good sources. so that's question number one, what number should the NALU be for the different frames ?

  anyway, when i use av_read_frame on the mov file, i get frame that look like this :

  4B = size, 1B = XX and then data. (at least this is what i think i get)

  the files where i store the frames are always size long when i look at them in a hexeditor(otherwise as well of course). and XX is always 65(ie. type(XX) = 5) in the first and then 61(ie. type(XX) = 1) for a couple of frames and then back to being 65 for one frame and so on.

  i guess that these are frames like : I P P P P P P I P P P P P P P I P P P P P P P .... however then my assumption about the type numbers for the different frame types are false, which is highly likely. (any suggestion on reading about this ? except the ISO/IEC 14496-10, i don't understand it really).

  I've tried to remove the size and append 00 00 00 01 before the XX byte and the data but without success. any tips on how i could modify the frames to be valid H264 encoded frames ?

• encoding jpeg as h264 video

  22 février 2017, par jefftimesten

  I am using the following command to encode an AVI to an H264 video for use in an HTML5 video tag :

  ffmpeg -y -i "test.avi" -vcodec libx264 -vpre slow -vpre baseline -g 30 "out.mp4"

  And this works just fine. But I also want to create a placeholder video (long story) from a single still image, so I do this :

  ffmpeg -y -i "test.jpg" -vcodec libx264 -vpre slow -vpre baseline -g 30 "out.mp4"

  And this doesn’t work. What gives ?

  EDIT : After trying LordNeckbeards answer, here is my full output : http://pastebin.com/axhKpkLx

• Using FFMPEG to join two MTS files together

  1er juillet 2016, par Reado

  I have two MTS video files, each one 2 minutes long. I need to be able to join the files together and convert the format to MPEG4. I have a suitable command line for converting MTS to MP4 but don’t know how to join the files together in the first place.

  Some articles on the web suggest using the CAT command, like :

  cat video1.mts video2.mts > whole_video.mts

  However this doesn’t work and according to FFMPEG, "whole_video.mts" is only 2 minutes long, not 4 minutes.

  Does anyone know how to join the files together ? Is FFMPEG the best program to use to do this ? Thanks in advance.