62
votes
Accepted
Fix bad files and streams with ffmpeg so VLC and other players would not crash
If parts of the file reside on physically bad sectors, or for whatever reason, the OS cannot serve the whole file to FFmpeg, then naturally FFmpeg can't do anything about that. You should get a ...
- 32.6k
31
votes
Repeat/loop Input Video with ffmpeg?
With ffmpeg 2.8.4, the following command creates output.mp4 that is a repeating copy of input.mp4 until the ffmpeg process is stopped:
ffmpeg -stream_loop -1 -i input.mp4 -c copy output.mp4
This ...
- 456
16
votes
Repeat/loop Input Video with ffmpeg?
At least on FFmpeg 2.8.x (but oldie should works too) you can use lavfi as input format and complex filter graph using movie and setpts filters as a argument for -i option.
Next command doing this ...
- 261
15
votes
Accepted
ffmpeg: explicitly tag h.264 as bt.601, rather than leaving unspecified?
PAL and NTSC have different color primaries, so
NTSC = SMPTE 170M = BT 601 525
PAL = BT 470 BG = BT 601 625
See the rows for value 5 & 6 on the table on page 387 of the active H.264 standard.
...
- 32.6k
13
votes
Accepted
Using h264 in loseless mode brings small unexpected results
It's an artifact of the player, not the encoder.
I used the command below to generate a RGB format capture in HuffYUV
ffmpeg -f dshow -video_size 1920x1080 -framerate 30 -i video="screen-capture-...
- 32.6k
10
votes
Accepted
ffmpeg encode in all-i mode h264 and h265 streams
For H264
ffmpeg -i input -c:v libx264 -intra output
For H265, seems no alias or preset has been set yet
ffmpeg -i input -c:v libx265 -x265-params frame-threads=4:keyint=1:ref=1:no-open-gop=1:...
- 32.6k
9
votes
Accepted
H.264 Max Resolution
One of the bits of information associated with a H264 stream is its level. The level informs the decoder the computational resources needed for a successful decode. Turns out that the highest level 5....
- 32.6k
8
votes
Accepted
What CRF or settings I should choose for h265 in order to achieve a similiar quality of h264?
The CRF scales for x264 and x265 do not correspond. x265 CRF 28 is supposed to be equivalent to x264 CRF 23. But x265 is not yet as mature in its development as x264, so take that CRF equivalence with ...
- 32.6k
8
votes
H.264 Max Resolution
H.264/AVC is not limited for 4K in terms of max resolution as it supports DCI 4K (4092x2160) @ 60 fps at Level 5.2. For example Sony already uses XAVC which is exactly 4K AVC.
For a while the max ...
- 436
8
votes
Accepted
Differences of h.264 and h.265?
HEVC (High Efficiency Video Coding), the new video coding standard brings promise of huge bandwidth savings of approx. 40-45% over H.264 encoded content
More info here
- 216
8
votes
Accepted
FFMPEG: Loop video to the length of audio
For video, stream_loop option should be used.
ffmpeg -y -stream_loop -1 -i video -i audio.mp3 -fflags +shortest -max_interleave_delta 50000 -c copy output.mp4
You'll have to use a very recent ...
- 32.6k
8
votes
Accepted
What's the difference between "visually lossless" and real lossless and what does this mean for future encodes?
Technically lossless, or real lossless, means that when the output is decoded by a conformant decoder, the result is mathematically identical to the input.
Visually lossless is a non-rigorous term ...
- 32.6k
7
votes
Fix bad files and streams with ffmpeg so VLC and other players would not crash
In the search of a better answer a possible way could be:
ffmpeg -i video.mkv -c copy video_fixed.mkv
However I'm pretty sure there are some extra options that can make the result even better..
- 1,616
7
votes
How do I encode videos into h.264 at 8k resolution?
Are you sure the 8k videos on your computer are actually h.264, and not h.265? The max resolution of h.264 level 5.2 is still 4096x2305. To convert beyond that in Premiere, you need to chose HEVC (h....
- 4,444
6
votes
Accepted
It is better to have more B-frames or more P-frame for video streaming?
"Q: Is it better to have more B-frames or more P-frame for video streaming?".
From: https://en.wikipedia.org/wiki/Video_compression_picture_types
The three major picture types used in the ...
- 847
5
votes
Accepted
Encoding videos for MPEG-DASH
I would get as far away from EE as possible. Using the x264 tool, and mp4box, you can convert and segment out the files which are ready to be streamed to any dash compatible players. Especially since ...
- 111
5
votes
How can I convert .MTS file (AVCHD) to .mp4 by ffmpeg without re-encoding H264 video stream?
As per this ffmpeg bug
Interlaced H.264 packets are split causing MP4 STTS
when remuxing a mpeg-ts containing interlaced H.264 into mp4, both
fields of each video frame are split into seperate ...
- 32.6k
5
votes
Accepted
How to convert 10-bit H.265 videos to H.264 without losing quality
it looks like the Video is encoded in 4000 kbit/s, instead of a Rate Factor (RF).
But that isn't the issue here. The issue is: while 264 does support lossless encoding, it not widely compatible! (you ...
5
votes
Accepted
Resuming a partially-completed encode with FFmpeg
I've come up with a "good enough" solution to this problem, as it doesn't appear possible at the time of writing to actually pick up a partial encode that was cut off arbitrarily and ...
- 321
5
votes
Accepted
ffmpeg vf scale shifts colors to washed out
The video's color transfer characteristics (trc) and color primaries flags are not being set on the output video, which is causing the video player to use incorrect values for playback, resulting in ...
- 321
4
votes
Accepted
Adobe Premiere saves m4v instead of mp4
I encountered the same issue when I turned the sound off in the sequence. When I re-enabled audio export, even though I didn't want to or need to, it saved as an mp4 again.
- 56
4
votes
Accepted
What's different between Premiere's own h.264 and QT h.264 encoders?
The encoder is always the same, namely Adobe Media Encoder. What you're changing is only the format, which admittedly is a bit confusing since that dropdown mixes up a couple of concepts which don't ...
- 5,412
4
votes
Accepted
.mkv file not playing in HEVC/H.265 supported player
Both files that don't play feature Opus as the audio codec. As per this site, Opus is not one of the supported audio codecs.
Transcode the audio:
ffmpeg -i in.mkv -c:v copy out.mkv
- 32.6k
4
votes
How do I encode videos into h.264 at 8k resolution?
FFmpeg can use x264 to output to 8K.
Basic template:
ffmpeg -i 4KfromPremiere.mp4 -vf scale=7680x4320 -crf 20 out.mp4
- 32.6k
4
votes
Accepted
Print to file: Details of every NAL unit in raw H.264 file
You can use the trace_headers bitstream filter in ffmpeg
ffmpeg -i in.264 -c copy -bsf:v trace_headers -f null - 2> NALUS.txt
The text file will have data like this,
[AVBSFContext @ ...
- 32.6k
4
votes
Accepted
What's special about Apple-device generated HEVC files that (apparently) x265 can't produce?
Well. Turns out that if you read this guide for HLS streams, it gives a bunch of details on how the actual video formats should be set up. In particular, for HEVC, it says:
1.10. You SHOULD use ...
- 71
4
votes
Accepted
Smallest Possible Video File in H.264 Format
A one frame H264 stream would have to consist of an intra-coded frame, so there is a size floor in effect.
This ffmpeg command produces a 1.7 kiB file
ffmpeg -f lavfi -i color=blue:s=1280x720 -...
- 32.6k
4
votes
Accepted
Producing small H.264 files with Adobe Media Encoder vs ffmpeg/libx264
Adobe licenses its H.264 encoder from Mainconcept, which doesn't do that well at low bitrates. x264 is pretty much the frontier when it comes at low size output for a given quality target, or quality ...
- 32.6k
3
votes
Differences of h.264 and h.265?
h.265 is obviously more compressed than h.264 and was built for UHD and 4K. Though 1080 files still look great and are even smaller when encoded with h.265 than h.264. Some computers may have trouble ...
- 225
3
votes
Accepted
Copying h.264 video from TS into MP4 changes frame rate and time
As per a comment here, removing the -r flag ought to do this properly. You have another -r flag for the input, also. Remove both of them, and it should properly copy the stream as it is into a new ...
- 146
Only top scored, non community-wiki answers of a minimum length are eligible