In my site, having upload video(only mp4 videos) functionality and then to combine. For the combining i used Mp4Box, If we want combine all the mp4 video, those videos have to same dimesions,bitrate,codecs,samplerate,etc, So while uploading the mp4 videos itself we set the constant dimension and other details like
ffmpeg -i test.mp4 -r 25 -s 640x360 -ar 48000 -acodec copy -f mp4 -vcodec libx264 -vpre default -async 1 -strict -2 -qscale 10 test.mp4
After using this command the video quality will loss fro the original video, Kindly suggest any solution?
Add
-qp 0
§ Lossless H.264
Related
If I convert an audio file with an album cover thank's to:
ffmpeg -i sample1.flac -ar 48000 -vn -c:a libvorbis -b:a 320k sample1.ogg
My sample1.ogg file doesn't have any album cover. Is there a way to ask explicitly to ffmpeg to keep the cover ?
instead "-vn" write "-c:v libtheora -q:a 10".
-vn - means no video, picture is frame of video in ffmpeg
Sum up of answers I found: Remove the option -vn which means: no video, because thumbnail are frame of video. Use libtheora instead of libvorbis. If you get a bitrate error, remove option -b:a 320k. At the end we get:
ffmpeg -i file.flac -c:v libtheora -q:v 10 -c:a libvorbis file.ogg
This gives you a file with an audio and a video content.
If you prefer to extract thumbnail in a separate file (to re-add it later for example), use:
ffmpeg -i file.flac -an -vcodec copy thumbnail.jpg
Thank's to Баяр Гончикжапов for his help and answers!
I first tried:
ffmpeg -y -i image.jpg -i audio.mp3 -c:a copy output.mp4
but when I uploaded to video sharing websites (bilibili.com), it says "no video track", so I tried:
ffmpeg -r 1 -loop 1 -i image.jpg -i audio.mp3 -acodec copy -r 1 -shortest output.mp4
The file was successfully uploaded, but when I watched it on the website, the image disappeared and it turned grey. I merged 6 videos and only one of them can be normally played back.
What should I do?
Problems with your command #2:
Frame rate is too low. Most players are unable to play 1 fps. Use 10 fps or higher for output, or set input -framerate to 10 fps or higher.
Chroma subsampling. Most players can only play 4:2:0, so use the format filter to force it to 4:2:0.
MP3 in MP4. Some players are unable to play MP3 in MP4. For highest compatibility use AAC. ffmpeg will choose AAC by default for MP4.
Faststart (optional). Add -movflags +faststart so MP4 can begin playback faster.
Command:
ffmpeg -framerate 1 -loop 1 -i image.jpg -i audio.mp3 -vf format=yuv420p -r 10 -shortest -movflags +faststart output.mp4
I am looking for a way to convert large number of MP3 files to videos, each using the same image. Efficient processing time is important.
I tried the following:
ffmpeg -i image.jpg -i audio.mp3 -vcodec libx264 video.mp4
VLC media player played the resulting video file with the correct sound, but a blank screen.
Microsoft Media Player played the sound and showed the intended image. I uploaded the video to YouTube and received the message:
"The video has failed to process. Please make sure you are uploading a supported file type."
How can I make this work?
Create video:
ffmpeg -framerate 6 -loop 1 -i input.jpg -c:v libx264 -vf format=yuv420p -t 00:10:00 video.mp4
The duration (-t) should be ≥ the MP3 with the longest duration.
Now stream copy the same video for each MP3:
ffmpeg -i video.mp4 -i audio.mp3 -map 0:v -map 1:a -c copy -movflags +faststart -shortest output.mp4
Some notes regarding compatibility:
MP3 in MP4 does not have universal support, but will be fine in YouTube. If your target players do not like it then add -c:a aac after -c copy to output AAC audio.
If your target player does not like it then increase the -framerate value or add the -r output option with an appropriate value, such as -r 15. Again, YouTube should be able to handle it.
How to convert image and music to video? I would like YouTube video. I like FFMPEG command or other Ubuntu free software. I would like: *.mp3 + *.jpg = *.flv
Here is an example using a recent ffmpeg syntax:
ffmpeg -loop 1 -i image.jpg -i music.mp3 -shortest -c:v libx264 -crf 20 -tune stillimage -c:a copy output.mkv
This example will copy the audio instead of re-encoding to preserve quality. Adjust quality if desired with the CRF option. See the FFmpeg and x264 Encoding Guide for more information.
Super User (another StackExchange site) is a better place for ffmpeg usage questions since Stack Overflow is programming specific.
Today I was in need of merging an image and an audio file into a video file. Since none of the answers that I found on SO worked for me, I'm leaving here what worked for me after trial and error:
ffmpeg -loop 1 -t 205 -i audio.mp3 -i image.jpg -crf 20 test.flv
Where 205 is the duration of the input mp3 file in seconds -> 3:25 minutes.
(Tested with FFmpeg SVN-r13582)
I'm looking for the best in quality when converting videos.
I only want to use lossless audio and video encoders and a good container.
How do I enable lossless x264 vcodec for ffmpeg?
I currently use ffmpeg -i "inputvideo" -s 1280x720 -ar 48000 -threads 4 -vcodec libx264 -acodec copy -dsur_mode 2 -ac 6 "outputvideo720p.mkv"
I plan on using flac for the acodec by am unsure because I don't want to use quality if it switches to 16-bit instead of 24-bit
You can use x264 in lossless manner I think. As in here and here use these flags for ffmpeg:
ffmpeg -i input.avi -c:v libx264 -qp 0 output.mkv
In case you couldn't load libx264, remove ffmpeg and install from source with x264 enabled. Here is how to.