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Questions tagged [mpeg4]

The tag has no usage guidance.

-1
votes
1answer
47 views

Generate mpeg 4 file with specific format with h.264 codec

I need a specific format in my .mp4 video file: 1. Only I and P frames 2. Each P frame based on only the previous (temporally) I frame 3. An I frame every second or so Is it possible to generate ...
0
votes
1answer
75 views

ffmpeg transcode twice compress further?

I have a collection of avi videos (say A). I first convert them into MPEG4 Part2 (say B) using ffmpeg -i ${inname} -vf scale=340:256,setsar=1:1 -q:v 1 -c:v mpeg4 -g 12 -f rawvideo ${outname}. The ...
3
votes
2answers
327 views

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 ...
2
votes
1answer
162 views

HE AACv2 Audio profile on MediaInfo

I have a SDI input encoder with audio configuration as Coding : AAC/HE-AAC Coding Mode : MPEG-4 HE AAC v2 Mode : Stereo (2/0) Sameple Rate : 48KHz ES Bitrate : 64Kbps Transport Format : ADTS And, ...
2
votes
0answers
561 views

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 ...
0
votes
1answer
536 views

Does using preset=placebo or veryslow option also decrease decode time?

When using h.264 I use preset=placebo option. It increases encoding efficiency, but I don't know I feel like it is also increasing decoding time. Is it right or it doesn't affect decoding time at all?
7
votes
1answer
8k views

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 ...
1
vote
1answer
2k views

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 ...
1
vote
1answer
652 views

Extract Y-channel of every I-frame from MPEG4 movie as loslessly as possible

I'm working on a video tracking experiment and got stuck with videos that are quite badly compressed with the MPEG4 DivX 5x/6x codec. I'm fairly new to image formats, codecs and compression, but I ...
0
votes
0answers
191 views

How can I edit Android-grabbed MP4 files in Virtualdub?

Android's command adb shell screenrecord x.mp4 is supposed to produce MPEG-4 files. VirtualDub is supposed to support MPEG-4 files through the use of the FFInputDriver plugin. The latter is true ...
-1
votes
1answer
115 views

Convert .mp4 video file for playback on camcorder

I have a .mp4 file with MPEG4 for video and MP3 for audio that I need to convert to make my camcorder (a cheap one I got off eBay) play it back, but the only problem is that it doesn't accept anything ...
1
vote
1answer
3k views

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 ...
1
vote
1answer
4k views

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 ...
1
vote
0answers
896 views

Repair MP4 corrupted index

I have a corrupted MP4 file whose length is 25 minutes, but fter the first 4 minutes it jumps ahead to 20 minutes and one cannot playback the middle portion. It appears as though the index is ...
24
votes
2answers
50k views

Repairing 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 ...
0
votes
0answers
145 views

How can I truncate .m4v elementary stream files?

I have two .m4v MPEG4-Visual elementary streams which need to be truncated down to a specific length, leaving the same starting point and simply specifying a frame number at which to end. I have ...
2
votes
0answers
913 views

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 ...
2
votes
2answers
3k views

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?
1
vote
1answer
475 views

What are the “software” requirements for a 3D video?

Today, looking for the technical explanations about MPEG4, I saw that it can implement the VRML rendering for a 3D video. This makes me wondering about the "software" requirements to make or to see a ...
23
votes
2answers
50k views

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 ...
2
votes
1answer
5k views

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 ...
0
votes
1answer
4k views

MPEG-4 (Base Media / Version 2) to MPEG-4 (3GPP Media Release 5)

Hi I want to convert an MP4 file to work with a Sony Ericsson Aino Here is a detailed comparison of the file format that I want to convert to which is MP4(3GPP) and the file that I want to convert ...
2
votes
1answer
236 views

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 ...
0
votes
2answers
2k views

avi to mpeg4 command line convertor

I am writting program for recording IP cameras videos. I use Aforge framework and can save video in avi format, but it's size is too big. I need some command line program to convert videos from avi to ...
38
votes
5answers
57k views

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) ...
0
votes
1answer
182 views

Encode divx into iPhone-compatible MPEG4 while downloading?

Is there a way to encode a DivX file into an iPhone-compatible video file while the DivX is downloading/streaming? Further, is it possible to re-stream the resulting iPhone-compatible video to the ...
1
vote
7answers
1k views

Encoding Uncompressed video

I'd like to encode uncompressed video into compressed avi or mpeg4. Was wondering what program I should look at getting to do such a task. Videos are between 3 and 20 minutes long, and range anywhere ...
1
vote
1answer
875 views

Creating a DVD-player compatible movie file

I've created encoded a MPEG-4 file with mplayer and placed it on a DVD. The file is identified as RIFF (little-endian) data, AVI, 320 x 240, 25.00 fps, video: FFMpeg MPEG-4, audio: uncompressed PCM ...
4
votes
3answers
7k views

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 ...