Questions tagged [decoding]

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1answer
23 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
38 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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0answers
67 views

FFmpeg 2017 vs 2019 decoding performance improvement

I was trying to do some basic profiling on ffmpeg, following my previous question here. I have a relatively high-bitrate .ts file (17mbps), and I have two versions of ffmpeg (2017.3 and 2019.4), and ...
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1answer
33 views

FFmpeg run multiple filters in parallel from C API

I successfully applied a FFmpeg filter from C API (my previous question here). I see the filters are running sequentially. Now the question is, how can I run multiple filters in parallel? If run ...
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1answer
26 views

Compile FFmpeg example code

I was trying to compile an FFmpeg example code HERE that illustrates how to use filters using it's C APIs. I compiled the code (throuh a universal make). As the usage suggests, I'm doing this: ./...
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1answer
29 views

Objective video quality assessment

I'm trying to develop a tool that given a video (without a reference video), it can measure the quality. Basically given some thresholds, it assigns them a rating (I just need 4 classes 1-4). Since we ...
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1answer
123 views

Call FFmpeg filter from source code (C API)

I'm trying to find out how to call a FFmpeg filter (freezedetect) from within FFmpeg's source code. I see the filter's file is under libavfilter/vf_freezedetect.c, but I don't know how to use that ...
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0answers
391 views

Help decoding video from hardware encoder

I obtained this video from directly reading the memory of a hardware encoder. The encoder supposedly produces a HEVC (H.265) or H.264 video stream, but I can't accurately play or convert the file with ...
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0answers
83 views

Upscale the key frames while decoding!

I would like to apply some kind of super-resolution (SR) to the keyframes in an H.264 video. The SR process should target the keyframes and upscale them by a factor of 2. For the past few days, I've ...
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1answer
28 views

Retrieve and decode V-Chip data from an aired digital TV stream

I'm trying to retrieve and decode V-chip data from my TV streams (NTSC/ATSC digital streams). Apparently these data are embedded somewhere in the stream itself, but I have no clue how they are ...
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1answer
35 views

What happens when a compressed video is played back?

I've been reading up on video compression. I understand that 'raw' media file sizes are to big for practical usage so they have to be compressed, but I'm wondering what happens when the video is being ...
0
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1answer
709 views

FFMPEG 4.0 skipping frames

I have noticed today that when I use ffmpeg 4.0 stable to decode some TS files into y4m or ffv1 it occasionally skips some frames. My input file has all the frames burned into the picture and I am ...
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1answer
2k views

Print to file: Details of every NAL unit in raw H.264 file

I have a raw H.264 file. I would like to retrive both length and frame number of every NAL unit in this file. The result must be printed to file. Is there any tool to do this? I have tried using H....
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2answers
102 views

How do you make a VHS-Rom Drive?

I want to rip (to make an EXACT copy of) a copyright-protected VHS. I do NOT want to record the VHS in Real–Time. How can I accomplish making an ACTUAL rip of a VHS? A VHS-Rom Drive would be the ...
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1answer
2k views

FFmpeg. CUDA decode. Past duration too large. Variable FPS

Please see my input udp stream information: ffprobe udp://IP:PORT Input #0, mpegts, from 'udp://IP:PORT': Duration: N/A, start: 42243.737022, bitrate: N/A Program 17 . . . Stream #0:0[...
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1answer
1k views

hardware cuda decoding error

Please see my input udp stream information: ffprobe udp://IP:PORT Input #0, mpegts, from 'udp://IP:PORT': Duration: N/A, start: 29796.225911, bitrate: N/A Program 16 Stream #0:3[0x641]: ...
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1answer
147 views

Please Explain the Codecs in my Example [closed]

Can someone explain what's happening in my project? Please use as much detail as possible, I just want to learn, thanks. I have an Apache web server. It contains many videos (.mp4 .mkv which are ?...
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0answers
571 views

Transcode FROM MPEG-DASH

I have an input MPEG-DASH stream and I want to transcode it. First of all, need to decode it and then route an output to FFmpeg and encode it, but not have any ideas how to decode MPEG-DASH. Please ...