Questions tagged [encoding]

The process and techniques used when storing moving images, sound, metadata and other streams as a digital file.

Filter by
Sorted by
Tagged with
0
votes
1answer
79 views

Is there a mathematical equation to compute the bitrate of a Cisco H.264 stream?

I'm working on adaptive streaming for video. As I'm using a Cisco Open H.264 Encoder, I'm testing multiple configurations for the encoder. A configuration consists in a several of parameters (bps, fps,...
1
vote
1answer
6k views

x265 encoding test: 12bit results a bigger file size than 8bit of the same config?

Just got curious of this x265 HEVC format, and tried it on a 1920x1080i BDMV stream video, one encoded with 8bit depth and then another encoded with 12bit depth. The results are, the 8bit output was ...
2
votes
3answers
142 views

Modify video file for viewing in generic media player

I have a file called ~/somePath/foo.264, containing video from a surveillance camera's DVR. I am unable to view this video on several media players including the default media player on an Apple ...
2
votes
2answers
770 views

How to calculate the length of the video file that was encoded so far?

I am using ffmpeg to convert a video file to H.264 format. If I call ffprobe while ffmpeg is still running the duration of the video is not known. Only when ffmpeg finishes the ffprobe will display ...
0
votes
1answer
736 views

Using AAC-HE for 5.1 audio?

A couple of questions when thinking about 5.1 audio encoding: What are the limitations of AAC-HE codec while doing 5.1 audio ? Why is AC3 preferred when compared to AAC-HE ?
4
votes
6answers
3k views

Does repeatedly saving a video degrade its quality?

I take a video file, let's say an mp4, and use, let's say Windows Movie Maker, to repeatedly just save it, with no edits. Every time, the software has to convert the video into a format it can edit, ...
5
votes
2answers
5k views

Removing MP4 encoding information

Is it possible to remove certain information form a MP4 file? Specifically things like tagging and encoding dates, Writing library and application, Encoding settings... No client needs to know when I ...
6
votes
2answers
27k views

8bit vs 10bit vs 12bit

I do a lot of HEVC encoding and what I've read is 10bit is always better than 8bit, even from an 8bit source, because it avoids rounding errors. Is that true? Also, then is 12bit better than 10bit or ...
2
votes
1answer
2k views

Convert 1920x1080 Video to 720x480 With Letterboxing

I'm trying to find the best application on windows to do this HD to SD conversion for a video server which requires files to be exactly 720x480/29.97fps MP4 H.264 to function. I can't find any options ...
3
votes
1answer
257 views

Netflix encoding system - MAPLE

I understand that Netflix does all their encoding in AWS using EC2. They have a custom encoding software called MAPLE that chunks all source video into 2-3 second chunks and encodes in multiple codec ...
1
vote
1answer
955 views

Quicktime rendering issue

I am trying to export my composition from AE CC but when I hit 'Render' nothing happens. In status is says 'Rendering' but this is not the case and the cursor looks like it's working but nothing is ...
5
votes
1answer
5k views

How should I encode my 4K video stream?

I'm capturing uncompressed 4K video from my Sony A7R II via a video capture device, and am using ffmpeg to save the video. My problem is I don't know what codec to use. The two options I tried are: ...
1
vote
1answer
3k views

What are supported stream formats for h.265

I wanted to know what are the possible streaming formats for streaming a video using H.265. Does H.265 support rtsp and rtmp based streaming? Currently, I am using ffmpeg to live stream the camera ...
1
vote
1answer
1k views

How to prevent lossy re-encode of low-bitrate videos uploaded to YouTube

I have a huge number of low-res Flash videos (480x270, 30 fps, 800 Kbps) and I want to resample all those videos in 1280x720 with some added spatial sharpening and lomo filters to make them look nicer....
2
votes
1answer
227 views

How can I avoid Quicktime Vulnerability with h.264 encoded MP4 files?

I posted this earlier on SuperUser, but realized that this is likely the more appropriate forum for my question. We have several thousand very large MP4 files that have been encoded over the past ...
2
votes
0answers
5k views

Adobe Premiere Pro and Media Encoder crash on encoding

Well, I can't export anything, Premiere Pro or Media Encoder keep crashing. Crashes are quite unexpected, after several minutes or several hours, without any explanations: "Adobe [--] stopped working"...
1
vote
1answer
141 views

Best format to export to in blender

I am using blender video sequence editor feature. When I export my video I have subtle quality loss. There are mild flickering artifacts. I have a couple question related to that. First one, is what ...
1
vote
2answers
468 views

Recompressing many huge MOV files

My camcorder produces huge MOV files, and I use it for about 1 hour every day, which gives me more than 7 GB of data per day (around 128 MB per minute of recording). Here is the codec information ...
1
vote
1answer
60 views

Best Streaming Encoding Software to incorporate a message feed

I am trying to stream a weekly boardgaming video podcast. I was hoping to incorporate a message feed to video. I want the people playing the game to be able to show watchers their strategies without ...
0
votes
1answer
317 views

To MP4V, or to DX50, or not to be

Should i compress my final outputs down to FOURCC of DX50 or MP4V? Tis the question. I'm having a hard time deciding on this, since im not really sure what to expect in future technology development....
2
votes
2answers
86 views

How can I efficiently convert MOV / MPEG-4 files for long term storage?

I have a Canon 6D DSLR that I am shooting video on. The camera is set to capture 1280x720 60fps IPB MOV / MPEG-4 files. The video files are in the range of 250MB per minute of recording. I have ...
0
votes
1answer
2k views

How to avoid uploaded video being re-encode by Facebook

I just uploaded a video to Facebook yesterday, and then I tried to download the video as HD, and I realized that Facebook actually re-encode the video even though the original video file doesn't ...
4
votes
2answers
2k views

What is the correct MPEG-2 FourCC?

In my attempts to encode a video to MPEG-2 in an MOV (which seems to be a valid combination, at least according to Wikipedia), using ffmpeg (-vcodec mpeg2video) and other tools, I have become ...
0
votes
1answer
315 views

Exporting a video from Premiere spits out incorrect quality

I'm trying to export a video from Premiere(CC) with the following settings: I recorded this video in Motion-JPEG 1080p/60Fps out of Bandicam. I've recorded videos in Bandicam (same settings as ...
2
votes
1answer
22k views

Encoding videos for MPEG-DASH

I read this article on encoding for MPEG-DASH, which has helped me a little and then follow up article. My end goal is to create a batch file that can read in a directory of MP4 files, and then ...
1
vote
1answer
1k views

how to measure bitrate of video over time

Given an encoded video file with non-constant bitrate, how would one analyze the bitrate over time? So far I found one old program that produces a bitrate plot, but none that can give the raw data of ...
1
vote
1answer
726 views

How to convert an mkv file with hevc encoding to mkv with avc

I have some mkv files with a hevc encoding which is not allowing me to burn to disc in covertxtodvd as it shows no video track as the encoding isn't supported, i was wondering if it was possible to ...
3
votes
1answer
125 views

MPEG - the maximum range for R,G,B?

There are sentences: For analog video or MPEG (including DVD) output, the maximum range for R,G,B is [16, 235] (8-bit). For YUV, the maximum range for intensity (Y) is [16, 235] (8-bit). Is this ...
1
vote
1answer
883 views

x265: Is it possible to re-compress HEVC video without quality loss?

My situation: Transcoding 1080p bluray videos to HEVC. Audio untouched; My rig is old (pre-2012) and to speed up the process I'm using --preset ultrafast; From x265 documentation, I understand that ...
3
votes
0answers
1k views

FFMpeg encode with original codec

I know about the -c copy switch with ffmpeg, but this does not work with filters as it means "don't re-encode". But what I want is to have my output use the same stream formats as my input. So if I ...
0
votes
1answer
2k views

FFmpeg/Avconv unable to copy subtitles; Unsupported codec?

I've got an mp4 file with these streams (avconv -i file.mp4 or ffmpeg -i file.mp4): Stream #0.0(eng): Audio: aac, 48000 Hz, stereo, fltp, 125 kb/s (default) Stream #0.1(eng): Audio: ac3, 48000 Hz, 5....
1
vote
1answer
2k views

best way to publish low latency video on ffmpeg

I am trying to publish a stream of live video that need to get to the client side in under 3 sec in latency. I am using vMix to capture a 720p/50 stream from a camera, that by virtual camera letting ...
4
votes
1answer
1k views

Encode video for html5 and javascript controlled playback

I want to create something like Apples Mac Pro product page http://www.apple.com/de/mac-pro/ where html5 video playback is being controlled via javascript (by manually setting the currentTime ...
2
votes
1answer
1k views

Convert resolution 4096x2304 to 3840x2160 keeping the quality the same

I have recently come into possession of a couple of 4k movies with a resolution of 4096x2304. Unfortunately my Samsung 4k TV wont play anything over 3840x2160. I have managed to re-encode the videos ...
3
votes
5answers
230 views

Live streaming to a disk

Not sure if this is the right place to ask this question (pretty technical), but I thought I'd start here. I'm interested in building a website that will have a streaming-video feature. It's not ...
2
votes
0answers
1k views

Is there a simple explanation of x264 encoding parameters?

So, x264 is still the most popular (free) H.264 encoder out there. But it is also still considered ridiculously cryptic as well. There are tons of switches and options in the encoder that allow you to ...
2
votes
1answer
110 views

Auto upload (ftp) video file once it's finished encoding

I'm in a live production, and I'm clipping hundreds of short videos all day every day. What I'd like to do is use some application to set a watch folder, and as soon as I hit stop on the encoder, and ...
2
votes
0answers
276 views

Problems occurred when importing subtitles into Sony DVD Architect

I'm new to Sony DVD Architect, I can't import subtitles into DVD-Arc even though the file extension is .sub. I used Subtitle Edit to save my original subtitle file(in .ass format) to DVDSubtitle(.sub) ...
2
votes
1answer
56 views

Is there a way to get the bitrate of a specific region of a video?

I have some videos I recorded with my cell phone that I want to crop using Avisynth's crop(). I am using x264vfw with VirtualDub which asks for a target bitrate. I usually just get the bitrate from ...
3
votes
1answer
658 views

Container Type that doesn't corrupt on Encoding Crash

I've been produce videos on YouTube for a few years. I understand a vast majority of encoding options for x264 (My preferred encoder). I used to use MPEG-4 containers (.mp4) with my videos, however ...
15
votes
3answers
13k views

H.264 or VP9 for encoding for YouTube?

I make short films which I distribute through YouTube. I know YouTube uses VP9 for streaming, but YouTube still recommends uploading with h.264. It makes more sense to me to upload in as similar a ...
2
votes
0answers
219 views

Why is audio generated by avconv choppy?

I am using avconv to generate an AV stream, and the video is perfect, but the audio is very choppy using iOS Safari. Can anyone tell me what is wrong with my audio stream that's causing this? When ...
2
votes
0answers
58 views

How to see encoding progress in Compressor 4.1.3

Is there really no way to see progress of an encoding job in Apple Compressor 4.1.3? I started a batch (single job, one file) and this is all I see: My fan is blowing at full speed so I guess ...
2
votes
0answers
4k views

Fast encoding with ffmpeg

I know about presets but faster presets lose the video quality. Are there any hardware requirements I need to consider? Or are there any settings that I need to tweak? And lastly where do I place the -...
5
votes
1answer
892 views

Adobe Encoder fps and duration doesn't match

I have After Effects project file 25 fps, 29 seconds duration long. After exporting i get 725 png files - looks normal so far. But then i merge it to mp4 using Adobe Encoder, I get total 24 seconds ...
2
votes
1answer
90 views

After Effects - output formats

Why do I only have these formats in my output? Where's Windows Media Format?
4
votes
2answers
1k views

Upscaling or downscaling videos

I was wondering, is upscaling from the videoplayer worse then upscaling the video during encode? For example, consider the original source of a video is 640 x 480. Which of the following will produce ...
3
votes
1answer
453 views

Reasons for using DNxHD instead of ProRes?

I often use ProRes or DNxHD codec without any thoughts, because the quality is very similar, even though the code and the compression algorithm certainly is very different. I would like to know in ...
1
vote
2answers
181 views

What is the difference between AVCHD and ProRes in terms of quality?

Depending on the project and the camera of course I often have to work with ProRes or AVCHD codecs without any thoughts. I assume that the code and the compression algorithm certainly is very ...
2
votes
1answer
964 views

H.264 encoding in PowerDirector 10

I want to make videos for youtube, and I want to encode my videos in MPEG-4, but the PowerDirector 10 says that I need to activate the video codification by hardware and I activated it in the ...