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Questions tagged [mpeg4]

34 questions
44
votes
3 answers

How to repair a corrupt MP4?

I took a video from my Android phone (Sony Xperia P, if you need to know), and before I could stop recording it, the phone memory got full and the phone got hanged too. I rebooted the phone, the video was there, but I couldn't play it from any media…
noob
  • 1,395
44
votes
5 answers

Joining H264 *without* re-encoding

I have two halves of a single show in two .MP4 files, encoded in H264. I would like to join them without re-encoding. Is this possible? I managed to create a joined video as a Quicktime file (.mov) using Quicktime Pro, but then Quicktime Pro will…
jdmuys
  • 861
23
votes
2 answers

What do the numbers 240 and 360 mean when downloading video? How can I tell which video is more compressed?

I have downloaded some computer science lectures from YouTube recently. There is usually more than one choice of file size and file format to download. I noticed that for the same video, the downloadable one with FLV 240 extension is larger than…
DaMing
  • 233
10
votes
1 answer

What is the best way to losslessly compress MJPEG to MP4?

I have a few digital camera movies recorded in MJPEG that are taking a few GB of storage space. I would like to better compress them, but losing as little detail as possible, or none. Since MJPEG doesn't compress across frames, I think that any…
lpacheco
  • 687
6
votes
2 answers

How to encode XviD using ffmpeg for Home Theater/DVD Player?

I wanted to convert a file so I can play it my DVD player which only works with divx/xvid. I tried : ffmpeg.exe -y -i "in.mp4" -t 480.00 -vf scale=720:301,pad=720:576:0:137 -map 0:v:0 -map 0:1 -b:v 2500K -vcodec libxvid -aspect 1.25 -b:a:0 128K…
poqdavid
  • 663
5
votes
2 answers

Convert MPEG4 to AMV via ffmpeg

I am trying to convert a MPEG4 video to AMV via ffmpeg. I've searched through web about the appropriate formatand and also tried to check another AMV video parametrs. So I've found that there should be bitrate for sound 22050 for sound with…
ffmpeg beginner
  • 83
5
votes
1 answer

How to accurately split and combine videos with ffmpeg respecting inpoint/outpoint

I'm learning how to split and combine videos with ffmpeg. Presently I'm practicing on a 799 KB MP4, one_through_ten-timestamped.mp4, where each frame has a burnt-in "frame number" (up to frame 40, the burnt-in number advances only every other…
watkipet
  • 445
4
votes
3 answers

Synchronizing audio and video using MP4Box / ffmpeg to concatenate files

I have two H.264 encoded MPEG-4 files that I need to concatenate. I have been using MP4Box for this task by first ensuring the files are encoded identically (even went so far as to compare output from h264_parse on their video tracks) and then…
Jesse L
  • 143
4
votes
1 answer

Smart Trim an h.264 .MP4 Video file in ffmpeg

I would like to take live-captured h.264 video as an input and trim it to start in a fade up from black and end with a fade to black with as little encoding as possible. These fade in/out points may fall between I frames. It is not possible to trim…
HGBells
  • 43
3
votes
2 answers

Cut part of audio track in MP4 file

I have an .MP4 file with one video track (H.264, 25 FPS) and one audio track (MP2). The total length is ~2:52 (two hours, 52 minutes). I've noticed that A/V is synchronous before ~2:34 but async afterwards, i.e. audio is late ~0.3 s. My plan was…
user674865
2
votes
1 answer

why is mpeg4 encoder faster than libx264 using ffmpeg

I have been padding mp4 videos so they can become of the size 1920x1080 instead of 1920x800. I used initially used mpeg4 encoder using ffmpeg, the encoding was quick but the size of the file was more than 5 times larger than the original. I decided…
Falah Abu Hassan
  • 61
2
votes
0 answers

Trancoding a video with vlc and the MPEG-4 codec with a video bit rate

When I try to trancode a video with vlc using the MPEG-4 codec and a video bit rate, I get the following error : Either both buffer size and max rate or neither must be specified Here is the command line I used : vlc -vvv myvideo.m2ts…
Nicolas
  • 1,079
2
votes
2 answers

How can I convert trp video format to mpeg4?

Has anybody had experience with converting TRP format to MPEG4 or any other format playable on a PC?
user1097772
  • 129
2
votes
2 answers

Why does encoding a video using the MJPEG codec take longer than MPEG-4?

I am testing the encoding performance (MPEG-4 and MJPEG) of a smart camera. I have written an application in OpenCV/FFMPEG for performing encoding, where the application captures images from the camera and encodes them to a desired encoding format.…
umair
  • 41
2
votes
1 answer

What is the quickest way to merge multiple MPEG-4 files to a single DVD?

I am using Mac OS X 10.5 I have 30 MPEG-4 files, and I wish to burn these to a DVD that can be played in a standard DVD player (i.e. on a TV) What is the best way to burn these all to a DVD so that they play one after another. I have tried using…
Mazatec
  • 143
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