Questions tagged [encoding]

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

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93 views

How to fix Encoding Overloaded in OBS Studio?

I want to record a programming tutorial with OBS Studio in 1080p 30FPS. I have never changed the encoder, the output format is MP4. Although my computer has very good hardware, I get Encoding ...
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1answer
705 views

Combining two live RTMP streams into another RTMP stream, synchronization issues (with FFMPEG)

I'm trying to combine (side by side) two live video streams coming over RTMP, using the following ffmpeg command: ffmpeg -i "rtmp://first" -i "rtmp://first" -filter_complex "[0v][1v]xstack=inputs=2:...
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1answer
13 views

Do modern devices support decoding 4:4:4 pixel formats?

I am recording and distributing relatively low motion screen content (not games). Using h264, fine text often appears very blurry due to the poor subsampling with 4:2:0 and 4:2:2 pixel formats. With 4:...
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405 views

Where are the Source Scaling Options in Adobe Media Encoder CS6?

In Adobe Media encoder CC, the Settings in the drop-down menu have a Match Source option that will preserve the pixel size of the file. In this Adobe Help article, the authors of the page state that ...
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Hevc Transparent Channel? (Apple WWDC19)

So, Up until now, HEVC Supported Transparent. But there wasn't any encoding Software To Encode that Transparent Pixels in it. Until Apple made their Own Way of Putting Alpha pixels inside a consumer ...
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2answers
31 views

Does HEVC Support 16-Bit RGB Color Format?

I have some 3D Rendered Frames in 16-bit rgba Color Format.... I don't Wanna Lose Any Data... Because I have to Use those in editing.... But With Thousands of Frames in 4K File Size Matters.... So Why ...
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10 views

Trim Audio Only of a Video file - FFMPEG

I have a mkv file containing a Video 1 minute shorter than audio. I want to Cut out first 1 Minute of Audio Stream. How Would I accomplish That With ffmpeg? I tried -ss 00:01:00.000, But that also ...
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24 views

Scale Video, Without 'ffmpeg Scaler' converting colorspace from RGBA to YUV

I have a video in RGBA space contained in MPNG codec. Which is in 4K. I need to Convert that into a 1080p File... SO i Used this - ffmpeg -i input.mkv -vcodec libx265 -vf scale=1920:1080 -sws_flags ...
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2answers
713 views

How to extract each video scene with FFmpeg

I'm trying to detect scenes and save them as individual files with FFmpeg. I found this long command somewhere, but it fails with a good detection. I change the scenecut value, but I don't see any ...
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1answer
30 views

severe artifacts pixelation when using cuda rendering premiere pro

In premiere pro when I set the renderer to GPU Acceleration (CUDA), for the timeline and on media encoder export, half the video is completely messed up with lots of pixelation artifacts when I switch ...
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2answers
84 views

FFMPEG: is it possible to offset output frames from a selection of specific frames?

I'm doing some ffmpeg (4.1.3) transcodings by extracting specific frames from the source, in this case, the source can be either a movie or an image sequence, all working fine with the following ...
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54 views

How to H.265 to H.264 without losing quality

I have a MPEG-H Part2/HVEC (H.265) .mkv file (Planar 4:2:0 YUV 10-bit LE). Since my LG PF 1500 beamer does not read H.265 but H.264 I would like to convert it (HVEC -> H.264). I think handbrake is a ...
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29 views

What SOFTWARE could I use to encode to this spec?

Thanks in advance! It's an mpeg transport stream in a .ts wrapper. Layout would be as follows: Video (MPEG2, 80Mbps, CBR, All I Frame,422@HL) Audio1 (Track1/PID1) 1 pair LPCM(SMPTE 302M)48kHz Audio2 ...
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ffmpeg 4.2.3 error, Could not find codec parameters for stream 4 (Unknown: none): unknown codec:

ffmpeg 4.2.3 error, Could not find codec parameters for stream 4 (Unknown: none): unknown codec: This error is for gopro videofiles, where they can processed very fine with different ffmpeg command......
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11 views

How to change orientation 180 degrees to only two videofiles out of multiple, with compression to happen only once?

How to merge with ffmpeg multiple action camera (gopro) video files (eg. 30+) into one, and change the orientation 180 degrees to only two of these video files with encoding / compression to happen ...
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9 views

converting video to m1v

I am having an issue with converting a 1920x1080 video to m1v format. In the past I have used XMediaRecode for the task, but for some reason there is a persistent bug which prevents me from changing ...
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1answer
62 views

Issues with transcoding to a MXF container

I'm new here, so hi to all :). I'm new to FFmpeg too, and I'm trying to transcode a HEVC file to a mxf file and I'm having some issues. The original file is a rip I made from a Bluray HDR movie a ...
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What is video hinting?

I've just faced with such thing as hinting videos. Quick research showed me something about the fact that it makes "streaming better" and something about QuickTime Streaming Server. That wasn't really ...
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9 views

Post-production editing audio/video out of sync

I am trying to add two videos using ffmpeg and the output video/audio is out of sync (and fast forwarded). Goal is to put intro.mp4 before the original file clip.flv My approach is to Change the ...
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1answer
99 views

Good codec for embedded system video decoding

I need to get streaming video working where a source streams video to an embedded platform. This embedded system has an ARM-Cortex-A9 without a GPU or a hardware video decoder. Unfortunately I don't ...
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1answer
28 views

ffmpeg log missing “dup” and “drop” key-value pairs

For some reason, my ffmpeg output log does not show dup and drop key-value pairs. expect: ... frame=563 fps=138 q=23.0 size=13056kB time=00:00:09.42 bitrate=11346.8kbits/s dup=0 drop=0 speed= 2.3x .....
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1answer
169 views

How can I change/reduce the bitrate of AVI files using Adobe Premiere Pro CC or other tools?

I'm using Eprime and Experiment Builder which requires files in AVI format (AVI-XVid). The files are quite small already (various 2 second clips under 1mb), but are still too large which crash the ...
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1answer
41 views

x264 Downsides of a high CRF (22) intermediary codec between conversions instead of lossless

I have a huge collection of video files that are in the range of CRF 16-20 taking up TB's of space. The only need I have for these originals is that I have to encode them from time to time but the CRF ...
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18 views

FFmpeg merge two files from different sources with different bitrates

I have created an intro video with Adobe Premiere Pro and I want to add the intro video to my downloaded Mixer stream videos before uploading them to YouTube, without reencoding the complete video ...
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2answers
555 views

FFmpeg for m2t and Sony Bravia - not working

-f mp4 -c:v libx264 -preset veryslow -tune grain -profile:v high422 -flags +ildct+ilme I am preparing video to be streamed (DLNA) from my NAS to an older Sony Bravia. I have successfully created ...
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1answer
897 views

Largest input image size when encoding a video?

I got a bunch of really large 16 bit videos, approaching 65535×65535 pixels in size. These are essentially high quality timelapse panoramas. I want to convert them to a 7680×4320 movie (8K UHD, 8 bit)....
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1answer
26 views

Encode a small proxy file with multiple audio streams for editing on Linux

After capturing 2K video in 444p with OBS, I need to transcode it to a low quality proxy version that's still easy to scrub and not a huge file. I capture 3 audio tracks in 32-bit PCM and the image ...
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17 views

ffmpeg pad and rotate - colour differential on upload to youtube

I'm using ffmpeg to rotate a square video to the desired angle, and then pad it from 1250x1250 to 2300 x 1293 (16:9). I use the following set of commands: ffmpeg -i input.mp4 -vf "rotate=-74*PI/180" ...
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2answers
6k views

Add image under the video with ffmepg

I want to extend basic usage of watermark and put it under the video. That means. I have input video 720x480 and image 720x20. On output i want to have video 720x500 where video aspect is preserved ...
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Another question on Non-monotonous DTS in output stream

I use ffmpeg to convert and join multiple mp3 files into m4a. BITRATE=128k find . -name "*.mp3" | parallel --lb -k "ffmpeg -y -i {} -map 0:a -c:a aac -b:a $BITRATE {.}.m4a" OUT_NAME=${OUT_NAME:=out....
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21 views

How to export a video that is playable in WhatsApp?

I'm editing a video and want it to be playable inside WhatsApp. I've tried some configurations but when I send the video as a WhatsApp message, it always goes as an annexed document. The user can ...
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20 views

Editing issues with variable framerate input footage (Whatsapp videos)

I have to make a video for social media, mixing several short clips which have been sent to me via Whatsapp. I'm using Da Vinci Resolve 16. When taking the videos into the timeline, I get several ...
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90 views

ffmpeg rtmp server connection issues

I am trying to stream using ffmpeg rtmp using, ffmpeg -i out2.mp4 -c:v copy -c:a aac -listen 1 -ar 44100 -ab 64000 -f flv rtmp://localhost/live The process starts but nothing is happening after ...
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22 views

Extending the length of a video and overlaying an alpha PNG image sequence using FFMPEG

I’ve got several videos to which I’d like to add ‘outro’ animations to, using FFMPEG. The outro animation itself is a sequence of 41 frames of alpha PNG images named consecutively, from Outro.00000....
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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 ...
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36 views

What does “top coded first (swapped)” mean in ffmpeg output?

I am attempting to convert a 1080i top first H.264 video to another with interlacing maintained. But when I look at the output, after setting these flags: -top 1 -flags +ildct+ilme -x264-params ...
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1answer
919 views

How to create MPEG-DASH variants at resolutions where one dimension is not a whole number in pixels?

I've created a bunch of variants and a DASH manifest for Sintel, which more or less works, but does not pass validation. The issue is when I want to scale a video to a specific width, but the height ...
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1answer
2k views

How to generate decryption key from m3u8 manifest? (OR) How to decrypt an excrypted MP4 using URI and IV?

I am downloading an HLS video which is AES-128 encrypted. The issue is that the downloaded video is also encrypted and hence, not viewable. The website is serving 2 M3U8 manifests: The first ...
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85 views

VMAF wrong results using SVT-AV1 encoder

I have a source video (source.mkv, which is a 25fps 1080p x264 encoded video), and I have reencoded it using SVT-AV1, like this: ffmpeg -i source.mkv -nostdin -f rawvideo -pix_fmt yuv420p - | ...
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1answer
445 views

Fast VP9 still image encoding

I use this command to create "myFile.webm", a VP9 video with one still image : $ ffmpeg -i myOriginialPureAudioFile.opus -loop 1 -i myAudioFile_640x360.png -shortest -threads 4 -speed max -c:a copy ...
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4answers
115 views

Re-encoding Lossy formats with Lossless formats

I was re-encoding videos downloaded from YouTube with Lossless H.264 (using FFmpeg) because I'm experimenting with CRF=0. I found that resulting videos are much bigger (1 gigabyte) than the original ...
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6answers
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How to force Adobe Media Encoder to use 100% CPU and memory?

On my machine, Adobe Media Encoder is very slow. It takes 12 hours to render 4 minutes of 1080p video for YouTube (the video is based on Adobe After Effects project with an original MOV file and four ...
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27 views

Delta encoding for video files?

I have a very high quality video and I need to produce a high quality and a low quality version for transport into other systems. For the high quality version I use a lossy compression (currently ...
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92 views

What is the practical effect of x265 HEVC -tune fastdecode (vs. x264 without fastdecode)?

I have some still shots from a security camera. I want to reduce the archive size while keeping the details. I use -qb for encoding rather than -crf because -crf blurs the moving objects. I am ...
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11 views

ffmpeg adds two seconds of unwanted silence at end of video [duplicate]

I am creating a video file from a single image, and audio. Though, after running conversion the resulting video file is the audio track's length, plus two seconds. The audio codec does not affect ...
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15 views

Convert mp4 for different resolutions for playing using his

How do I transcode my mp4 video to different resolutions and create m3u8 for all for adaptive streaming
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48 views

How to configure B-frames (with no leading P-frames) in x265

I have been rolling around with my studies in x265 encoder for days by following this online x265 docs and this article. But I cannot figure out how to set the x265 encoder to code only I- and B-...
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1answer
564 views

Is there a way to improve h264_nvenc output quality?

I'm compressing some videos for archiving, and I came to this configuration which gives me a nice overall quality on a small size: ffmpeg -threads 4 -y -hide_banner -i input.mp4 -vf scale=-2:480 -c:v ...
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42 views

Is there any “concatenable” video format I can use for sequential streaming?

I'm writing a server and I have to play commercials on demand, so I'm trying to avoid re encoding video. I assume that video containers have headers and meta data, so it would not be possible. Is ...
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2answers
18 views

Can I make m4v files “better” before archiving? (adding keyframes, or lossless optimization, or ?) [closed]

I've got a decent bitrate DVD rip of an animated TV series, and before sending it to it's forever home (currently my PS3's extra HD space), I was wondering: can you take existing m4v files and make ...

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