A digital multimedia container format most commonly used to store video and audio, but which can also be used to store other data such as subtitles and still images.

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1answer
21 views

inserting video clip into another video but keep original audio

I need to replace video in a larger mp4 file with a smaller mp4 clip - but leaving the original (larger clip) audio intact. So for example I might want the first 2 seconds of SmallClip.mp4 to replace ...
2
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0answers
25 views

ffmpeg h264 crashes IE intermittently

First for moderators, this is relevant because I have incorporated ffmpeg in a program to render videos needed for a web-app. My problem is that the videos I render randomly crash IE 11. Other ...
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0answers
25 views

Trying to play 2 audio tracks at the same time in MPC-HC

Trying to record some footage, but I have two audio tracks - One track is audio from my PC, and the other track is from my microphone. MPC-HC only lets me play one track at the same time. Any ...
0
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1answer
33 views

How can I insert a censor bar into a mp4 movie?

I have a feature film in mp4 format. There is one scene where I just want to place a black censor box to conceal one part of the screen, no more than 7 seconds. I'm a beginner, so my concern is that ...
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0answers
20 views

MP4 Creation for fast startup

I have transport stream source and recorded this with following ffmpeg command line. ffmpeg -y -fflags +igndts -i udp://127.0.0.1:22500 -map 0 -fflags +igndts -codec copy -bsf:a aac_adtstoasc ...
2
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1answer
43 views

Does the MP4 HTML5 compatible video type allow for mono audio?

I'm doing some rendering in Vegas Pro and notice that if I select MainConcept (which gives me an HTML5 compatible MP4) the audio tab only has options for the bit rate and the sample rate. Before ...
0
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1answer
34 views

Is there a way to split a mp4 into 2 mp4, one is metadata.mp4 and another is mediadata.mp4

When media data is stored in the end of the mp4 file(it always be there),it is very difficult to extend or delete metadata infos,because metadata will use absolutely offset of this mp4 file to locate ...
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3answers
60 views

Is it possible to create a continuously looping video?

Is is possible to create a continuously looping video? Maybe by editing the container it's in so that it restarts automatically? I have a demonstration video that is playing on a TV in the lobby of ...
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1answer
212 views

How can I ensure that DaVinci Resolve will detect and/or load my .mp4 / .avi files?

New user of DaVinci Resolve, explain-like-I'm-five. =) Have installed and followed instructions for setting up Resolve 12 on my Windows 7 16gb ram computers with GeForce 760 gpu. Initially, Resolve ...
2
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1answer
57 views

Avid Media Composer Not Importing MP4s

I just installed Avid Media Composer 8.4.1, and am trying to edit some screen captured MP4s H.264 format I recorded with OBS. However, when I try to import,transcode or link to file the video layer ...
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1answer
82 views

Shooting .mp4 with the CANON EOS 600D

Please help. I need to know if I can shoot videos with my CANON EOS 600D in mp4 format. I don't want to go full HD .mov. I just want the camera to record small .mp4 videos - in order for me to load ...
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0answers
284 views

Need to convert an MP4 to an SCR

I need to convert an MP4 video (or any file format that I can export in Adobe Media Encoder, really) to an SCR file for a Windows screensaver. I'd really prefer not to convert it to MP4, then to FLV, ...
2
votes
1answer
333 views

Removing / Overlaying logo on mp4 video format with ffmpeg on linux

I'm trying to remove logo from an .mp4 video format with ffmpeg on linux machine without re-encoding (for preserving the same quality) with the following command: ffmpeg -i input.mp4 -vf ...
2
votes
1answer
197 views

Why does VLC player convert a 4-minute mp4 to a 4-hour webm?

I used standard webm settings in VLC player 2.2.1 (the latest) to convert a 4-minute mp4 made in Handbrake. In the conversion panel it says "Streaming 04:00" but the end result is "03:49:15" and, on ...
2
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4answers
2k views

Canon C100 mk1 AVCHD vs MP4

I recently bought a Canon C100 mk1 after lots of comparing, specs etc. Now I have a question which I cannot really find a final answer for on the interweb. The Canon C100 can record in either AVCHD ...
0
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1answer
325 views

How to encode video to profile high using ffmpeg?

This is my first post here. I am in a situation where my original file is of profile High and transcoding profile is High10. I am suspecting that this is the cause my video is not getting played in ...
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0answers
52 views

Losing audio in re-encoding with ffmpeg

I have some DVDs I want to save MP4s from. The video files are VOB files. I can play them if I change the extension to .mp4, but I can't use the seek bar in Windows Media Player. Also, the files are ...
0
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1answer
92 views

Burn a MP4 file with SRT subtitles

I have a movie and I want to burn it on a DVD, but I don't know how I do it and what the best options are. I want the DVD be able to play on PlayStation 4. I have a movie in MP4 format and the ...
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0answers
103 views

Recovering damaged-and-badly-recovered mp4 by HEX signature of each frame (and voice)

Question 1: What is the hex signature of EACH frame in an mp4 movie? What is the hex signature of the voice file in an mp4 movie? Question 2: I had mp4 films on a hard disk which was damaged. So I ...
3
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1answer
658 views

Video converted by FFMPEG has a different duration, why?

I convert videos using FFMPEG. My goal is to convert them to the MP4 container format (MPEG-4 Part 14) with AAC-encoded audio stream and MPEG-4 part 10-encoded video stream. I use the following line ...
2
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1answer
62 views

MP4 to DVD - suggestion for workflow

After a break of a few years I have started doing video editing again. So I bought Sony Vegas and later upgraded it to the latest version. For this particular project my source files was created by ...
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3answers
259 views

Quality of VHS converted to DVD

I work for a small library. We have a collection of VHS tapes that we have recorded to DVD using a Magnavox VHS HQ DVD recorder. They came in as .ogg, They came in a a set of files including some .VOB ...
2
votes
1answer
129 views

How to extract Xtra atom from MP4 file?

Can one dump/extract the Xtra atom from an MP4 file ? I am looking for a solution on a linux system (debian/jessie if possible). Apparently this atom is used by WMP, as per link. I'd like to be able ...
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1answer
486 views

Adding metadata for films/TV shows on Linux

I am looking for an open-source solution for automatically pulling films/TV shows informations. I've found MetaX (Windows only) and Subler (MacOSX only) from a post here. Apparently metadata sources ...
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0answers
1k views

Copying h.264 video from TS into MP4 changes frame rate and time

I have large MPEG-TS file that I am converting to MP4 using the below command. If I seek to the same time in the video in both the MP4 and the TS file, the MP4 will be a few frames behind the TS ...
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2answers
135 views

Why reencode MP4 to MOV for “easy post processing”?

On this page author reencodes MP4 from GoPro to MOV for "easy post processing". Why the processing becomes easier after that? The author also uses -sameq flag which is gone from ffmpeg without the ...
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1answer
1k views

How to extract MOOV atom/metadata from MP4 file?

Can one "dump"/extract the MOOV atom from an MP4 file? If so, how? Hoping for an obscure FFMPEG command. I need to be able to process/play a stream without searching for the MOOV atom over and over ...
2
votes
1answer
648 views

Avconv rotating mpeg4 - video loses quality

I'm a newbie in video editing on linux and am trying to rotate a video I took with my phone using AVCONV on an Ubuntu 12.04 machine. It all seems to go honky dory except the output is losing quality. ...
0
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1answer
169 views

ffmpeg split file retains original length

I've losslessly extracted 30m from a ~1.5h long video using the following ffmpeg command: ffmpeg -ss 0 -t 00:30:00 -i in.mp4 -acodec copy -vcodec copy out.mp4 The split was successful and out.mp4 ...
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2answers
2k views

MP4 / h.264 patent issues?

I know this is not a legal forum but I'm assuming this is a daily issue for most people on this site since h.264 video (AVC / MPEG4 part10) is so ubiquitous (and there is a legal tag here). I've read ...
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1answer
1k views

mp4 file will not play video, only audio on quicktime, fine on VLC

I have an mp4 file that will not play video, only audio, on QuickTime (10.4 on Yosemite) - and by extension does not show the correct icon in Finder not will it play properly on iOS devices. Others ...
3
votes
1answer
128 views

Lightworks detects aspect ratio incorrectly and clips video from ShadowPlay

I'm using Nvidia's ShadowPlay to record some game footage, and I am trying to edit it in Lightworks. When I import it, it clips off the edges of the content. I have the project set at 1080p 30fps (I ...
3
votes
2answers
3k views

Adobe Premiere saves m4v instead of mp4

I have problems with my Premiere Pro. It is first time this has happened, and I cannot understand why. I am creating a timelapse from my images. When I want to export media, I choose format H.264 ...
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1answer
497 views

Why do SRT subtitles fail to appear in my MP4 videos on iPhones?

I'm using videojs in an HTML page to publish a video with VTT captions. Problem is: iPhones do not play the mp4 in the videojs player - it renders the full videojs player, but when you click the Play ...
12
votes
3answers
13k views

Repeat/loop Input Video with ffmpeg?

I just want to loop a mp4 video with ffmpeg and keep the current settings and codec. For example if input.mp4 is 0:10 long, and I would want to loop it 4 times so output.mp4 is 0:40 long, how could I ...
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0answers
523 views

Switching between H.264 video streams on the fly?

I have several H.264 encoded MP4 files, as well as still images. From these I want to generate a single video stream that I can broadcast. The stream will be composed of alternating still images and ...
3
votes
2answers
949 views

How do I change the audio on a H.264 MP4 without re-rendering the file?

Is there any way to swap out the audio track on a rendered H.264 MPEG-4 without having to re-render the entire video project? Can this be done with Premiere, MPEG Streamclip, ffmpeg, or some other ...
0
votes
3answers
2k views

Why is MP4 black background gray in Internet Explorer 11?

I exported a Flash movie with a black background to MOV, and converted the MOV to mp4 (H.264). In Quicktime player, the background of the MOV and mp4 are black. In native players in Firefox and ...
1
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1answer
5k views

Using GoPro Studio to edit non-GoPro videos

I'm trying to use GoPro Studio to create a video that includes GoPro video as well as HD video from an iPhone. GoPro Studio was not able to deal with the .MOV file from the iPhone (the audio was ...
2
votes
1answer
136 views

Are mp4 bit rates the same as Flash bytes per frame?

I'm converting Flash movies to Mp4 (and webm) and having to learn lots about web video. The process starts with MOVs exported from Flash. For example, I have a MOV of 640px x 290px, 1m 58s, 2843 ...
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vote
1answer
161 views

Best way to increase the display size of a web video

I have a H.264 (ex-MOV, ex-Flash) video of 550px x 250 px. In the HTML player (videojs), I can easily set its size to 640px x 290px and it still looks OK (only a 16.363636% increase in display size). ...
3
votes
1answer
269 views

Mp4 Video Container and the Codecs use with it

I have started to learn about mp4 file format, and I just learned that mp4 is nothing but just a container that defines the structure of the video file, and that it has different codecs inside it for ...
4
votes
2answers
407 views

Are the properties (bitrate, fps) of my h.264 video OK for the web?

I'm converting a Flash vector animation to an mp4 video for the web. After trying and failing with Swiffy, it's the only way I have of preserving the work "for posterity", once Flash is gone. When ...
2
votes
1answer
81 views

How to Differentiate Subtitle Track Language Between Simplified and Traditional Chinese?

I'm using MP4Box (command line tool) to add subtitles to mp4 movies. The language of the subtitle seems to be set using ISO 639 codes. There's no differentiation between Simplified and Traditional ...
0
votes
1answer
96 views

I only have the .mp4 files from a Sony XDCAM EX shoot, is there a way I can still convert them for use in AfterEffects on Windows?

I no longer have access to the original recordings and the weird excess of files that Sony likes to bundle with the video you actually need. I'm running Windows 8.1 and Adobe After Effects CS6, and ...
0
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1answer
209 views

How to convert a .m4v video/audio file to .mp4 on Windows-7, for free

Does Windows-7 already have something that does this? Or is there a free download that does it?
2
votes
1answer
2k views

Avidemux “too short” error

I'm trying to encode clips with x264 in avidemux. Problems come when I set video length to 10 seconds while I resample output to 1 fps (without changing duration): avidemux report "Too short" error ...
2
votes
2answers
101 views

QuickTime File Format (Atoms & Flags)

What is the purpose of Media Atom 'flags' within the QuickTime videos, I see for the most part they are set to zero but what does this achieve? Documentation I am reading is the following: ...
3
votes
1answer
7k views

Merge MP4 with M4A

I have two files, one is MP4 file with video only and another is M4A audio file. What is the best and simpliest method of merging these two tracks in a single MP4 container? Is it possible to do this ...
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2answers
152 views

How to add captions file to video podcast?

I'm starting a tutorial video podcast and have recorded a couple of episodes. I've captioned them, and have the captions file in .srt format. However I haven't yet found a way to embed that file in ...