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
31 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 ...
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1answer
23 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
65 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
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1answer
28 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 ...
3
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1answer
74 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 ...
4
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0answers
147 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
42 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
185 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
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1answer
121 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. ...
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1answer
59 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
309 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
441 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 ...
2
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1answer
81 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 ...
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1answer
828 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
260 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 ...
6
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1answer
4k 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
175 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
318 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 ...
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3answers
638 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 ...
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1answer
669 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
85 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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1answer
58 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). ...
2
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1answer
102 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 codes inside it for ...
2
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2answers
258 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 ...
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1answer
50 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 ...
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1answer
75 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
127 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
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1answer
873 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
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2answers
54 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
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1answer
4k 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
110 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 ...
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0answers
58 views

Set ipad compatible thumbs for mp4 videos based on a frame of the video with command line

I have a directory of 100 mp4 files. All are working well on my ipad but most of them do not have a working thumb. I want to generate these thumbs with a command line command (on macosx) based on a ...
3
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2answers
114 views

mp4 - Codec or Container

Please explain, so confusing. I get that AVC is a video format, MKV is a container (that can contain mp4 video, FLAC audio etc.), but what is mp4 then?
0
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2answers
120 views

Is converting DVD to a format to play on a tablet legal (in the UK)

Simple question, is it legal to take a DVD you already own and convert (rip) it into a format (such as .mp4) so it can be played on a tablet or laptop ? In the past you had to use various nefarious ...
0
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1answer
258 views

Youtube Video Resolution Problem [closed]

I also posted this question in stack exchange for web applications (http://webapps.stackexchange.com/questions/52579/youtube-video-resolution-problem) I recently uploaded three ~30 second .mp4 files ...
0
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1answer
4k views

How to fix Sony Vegas 12.0 blank screen render?

I've got video recorded from my phone and I use Vegas to edit them, when I play the video back in VLC player the video orientation is ok, but when I import into Sony Vegas and it asks if I want to set ...
4
votes
2answers
2k views

How to convert an MTS file without loosing quality?

I have shot some videos on a Panasonic v720 camcorder. The videos are huge. I used the internal feature of the camcorder to convert to MP4 and the quality was reduced very much. What is the best ...
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1answer
52 views

Clear and informative tutorial on video file formats

...I think I will want to make a tutorial that covers video file formats, and their relationship to video codecs. There seems to always be a lot of confusion around these topics for emerging media ...
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2answers
258 views

Adobe Premier CS6 'Unable to open file' coming from Cineform

I just transformed a MP4 file coming from my GoPro into a MOV file using CineForm studio. It works great in MAC. However, when doing the same on Windows, and transforming from MP4 to AVI, when trying ...
0
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2answers
66 views

Adobe Premiere Pro CS6 Shortening Video

I have a video that is 38 minutes and 13 seconds in length but when I convert the video to the H.264 encoding using the 'YouTube HD 720p 29.97' preset the video is converted - but only the first 2 ...
1
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1answer
577 views

MP4 video rendering differently on different browsers and different machines

I have asked a similar question before, but we are still having the same issues. Background color of MP4 rendering incorrectly in QuickTime I am trying to encode MP4's for playback on a website. I ...
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1answer
404 views

Editing a 640x480 mp4 in premiere CS4

I have a video with 640x480 resolution, which I want to import into premiere and add a MASK over specific areas which should not be visible. I'm wondering what settings I should select when I start ...
0
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0answers
124 views

Where to start Transcoding with FFMPEG?

I would like to learn a lot about Transcoding video files with FFMPEG from any format to mp4 (hH264/AAC) format. We have a large repository of video files ranging from 1 MB to 2 GB of various formats ...
3
votes
3answers
33k views

How to Create a High Quality, Small File Size .mp4 from .mov

Recently, I helped a friend produce a short zombie comedy. He has now asked me to add it to the film's website as a digital download. I'm not having issues with the digital download. My issue is how ...
6
votes
3answers
389 views

Do video formats support colour profiles?

Recently, I was reading a wiki, dedicated to one popular cartoon show and stumbled upon an interesting problem: From left to right: frames from the US iTunes, Australian iTunes and US iTunes version ...
3
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2answers
290 views

Possible to use sRGB as mp4 colorspace?

I have an mp4 using h264 that i'm using in the background of a website. It has to blend in with the background image. I've already created ogv and webm videos for firefox and chrome and these work ...
3
votes
1answer
5k views

How to force ffmpeg to insert keyframe at first frame when downsampling a framerate of a video with x264 vcodec

I have a mpeg4 video at 25fps. This video contains just one static frame. I'm trying to downsample the frame rate to 1fps and convert the video to x246 (mp4). I ran the following ffmpeg command: ...
4
votes
1answer
458 views

How to create a x264 (mp4) video with the smallest size using ffmpeg that has just 1 image through entire video?

I'm creating narrated mp4 (x264+aac) videos for books. Each video has just the book's cover as the background. I wonder what would be the most effective way to create such videos with ffmpeg? I've ...
2
votes
3answers
16k views

Can I manually change an .mp4 to .m4v by changing the extension in the Finder (mac) or explorer (win)?

I need to change an .mp4 (h264, AAC-Audio) to an exactly same .m4v. Can I just rename it from "X.mp4" to "X.m4v"? By renaming, I mean clicking on it in Finder (Mac) or Explorer (Win) and renaming it.
6
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2answers
1k views

I changed the .mp4 extension of my video to .mpg and it still opens and plays fine (in VLC and in Windows Media Player). Why is this so?

I'm uploading a file to an external system that accepts only mpg or mpeg extension files. I had a mp4 file so I changed the mp4 extension to mpg and I was able to upload the file into the system. ...