All Questions
176
questions
3
votes
1
answer
2k
views
Preset "Slow" producing much bigger files than preset "Ultrafast" - Why?
Today I tried to find out which difference in file size the preset slow makes compared to the preset ultrafast when encoding a video (if all other parameters are the same). I took a video with ...
- 1,835
0
votes
1
answer
1k
views
Different outputs when encode to h265 using CPU only and GPU together
I'm using ffmpeg to convert .mp4,.mkv files with enconde h264 to h265 using CPU only, if using GPU together will outputs the same as using cpu only?
for %%a in (*.mkv, *.mp4) do (
ffmpeg -i "%...
- 125
2
votes
2
answers
3k
views
How to extrack motion vector data without decoding the whole video
I want to extract the motion vector from the encoded h264 stream without performing a full decode of the frame.
I'm using the FFmpeg library and am aware of extracting the information using the ...
- 123
0
votes
0
answers
1k
views
Why I do get "Segmentation fault (core dumped)" when using ffmpeg encoding AMD AMF H.264 in Ubuntu?
Hello I built ffmpeg with AMD AMF drivers on Ubuntu 22.04 and when I run this command:
ffmpeg -i video_sample.mp4 -c:v h264_amf output.mp4
I get this error:
ffmpeg version N-107316-gf9dd8fcf9b ...
- 59
0
votes
1
answer
7k
views
ffmpeg command to convert from mp4 video to .h264 raw frame with avcc format
I want to convert my mp4 video (BigBuckBunny.mp4) to BigBuckBunny.h264 file. I used the following the command in ffmpeg.
ffmpeg.exe -i c:\BigBuckBunny.mp4 -c:v libx264 c:\Bunni2.h264
This command is ...
- 1
0
votes
1
answer
703
views
How do I find what bitrate a CPU/GPU can decode?
I'm exporting videos to play locally on a dedicated player with a CPU like this.
The integrated GPU supports up to 4096x2304@60Hz, I assume that's talking about uncompressed video, right?
I also see ...
- 3
1
vote
0
answers
573
views
ffmpeg - Redownload missing fragments to fix downloaded stream
I have dowloaded an H.264 video stream using ffmpeg -i <URL> -c copy <name>.mp4 but ffmpeg reports that it has skipped some fragments. Since the stream is still online (with, I suppose, ...
- 143
0
votes
0
answers
363
views
Losslessly reducing framerate of a 'video of a video'
I asked this yesterday but it was incorrectly closed as a dupe of question:Reduce video frame rate without dropping useful frames
The difference between that question and this question is - in that ...
- 117
0
votes
1
answer
5k
views
FFmpeg: h264_qsv slower than libx264 (real-time buffer too full)
I use configuration: Windows 10 IoT, Intel Celeron N3350E (with Intel HD Graphics).
Runing this line:
ffmpeg -f dshow -i video="USB Video":audio="USB Digital Audio" -c:v libx264 -...
- 21
1
vote
1
answer
6k
views
FFmpeg h264_qsv: Error initializing an internal MFX session: unsupported (-3)
Im using ffmpeg build for Windows from gyan.dev: release ffmpeg-5.0-full-build with hardware-support.
I need to capture a video from a USB video device, compress it and write it to a file.
I am using ...
- 21
0
votes
0
answers
733
views
Is a CRF of 1 overkill?
I am trying to save my collection of DVDs to my Mac to have in the TV app. I am using libx264 to encode from mpeg2video to h264. I want to maintain as much quality as possible and file size is not a ...
0
votes
0
answers
1k
views
H265 10 bit to H264 8 bit through NVENC looks terrible
I'm currently using FFMPEG run with Sickbeard Mp4 Automator to convert H265 video to H264 since my phone chugs hard playing H265 10 bitvideo. I set it to use NVENC and it's unnoticeable for brighter ...
1
vote
0
answers
2k
views
I need FFMPEG command to convert some video files from h.265 to h.264 with Nvidia hardware
I have a decent Nvidia graphics card, capable of h.265 and h.264 encoding and decoding in hardware (Geforce RTX 2060), running on a Ubuntu installation. I have a whole bunch of video files that I need ...
- 21
3
votes
1
answer
8k
views
How to convince ffmpeg that input is raw H264?
I have a raw H.264 video stream (which starts with hex 00 00 01 FC ..., a 3-byte start code followed by a NAL unit). ffmpeg can process it but it really doesn't want to...
Let's test
Let's say the ...
- 1,235
1
vote
1
answer
3k
views
FFMPEG: “DLL amfrt64.dll failed to open” on Windows
I experienced the following issue.
I'm using ffmpeg to batch resize/compress photos and videos on Windows 10. I used a version 3 and since upgraded to ver 4.4 of ffmpeg the quality of outputs dropped. ...
- 31