Questions tagged [transcode]
105 questions
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Android ffmpeg very slow to transcode
In Android phones (different phone models) it takes ffmpeg 5x the length of the video to transcode. A 1-minute video takes near 5 minutes to transcode. I have tried the following to improve performance and nothing has helped,
-b:v 16K to 1024K
-s…
Nat
- 300
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1 answer
How to convert AC3 to AAC on Windows from the CLI
I have a large number of MKV files with AC3 tracks that I want to re-encode to include an AAC track using a script. My current approach has been to extract the AC3 track (mkvextract) and attempt to re-encode that as AAC and then merge that back in…
fubar
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FFmpeg with node.js. Transcode a file to another format
Have a bit of a problem with this, I have an .avi file in which I would like to transcode into a .flv file using FFmpeg, here is what I have so far:
var ffmpeg = require('fluent-ffmpeg');
//make sure you set the correct path to your video file
var…
user2757842
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1 answer
FFmpeg playing audio slowly after conversion from AAC
I'm attempting to convert an AAC audio stream for playback. I've discovered that I need to convert from AV_SAMPLE_FMT_FLTP to AV_SAMPLE_FMT_S16 but when I do so the audio plays back at about half speed.
swr = swr_alloc();
assert(av_opt_set_int(swr,…
AnthonyM
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MOV to AVI Conversion - file size 0 bytes
I want to convert a MOV file to AVI file as a part of my project. The MOV is getting converted properly from a set of JPEG files. But am not able to convert the MOV to AVI. It says the output .avi file is of 0 bytes. Can somebody help please?
Here…
user1978900
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2 answers
Move newly created file
I have the following code and after the transcode finishes i wish to move the newly created file. But only after, i don't want to write to the other folder as it trancodes. That is why i presume using exec is better as this will only be processed if…
Keelan
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1 answer
Flash embedding image from string parameter
I'm trying to embed an image in the constructor of my RangedItem class
public class RangedItem extends Item{
public var speed:Number;
public function RangedItem(s:Number, n:String, d:Number, path:String):void{
super(n, d);
…
heems
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0
votes
2 answers
Problems with matching up PHP strings
I am making a page that transcodes videoes to different formats. My problem is that I want to skip transcoding mp4 files to mp4. So I have exploded the file extension and that works nicely. I am renaming the files I transcode with an added parameter…
Tom
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How reset PTS while converting with FFMPEG
While converting *.ts file with ffmpeg, I want to set the start pts to be 10, or other pts. How can I do that?
Some people said setpts can help. I tried, but failed. Maybe my command is not correct, so what is the correct way?
Qianliang Zhang
- 1
- 1
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votes
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FFMPEG: i need audio channels 7 & 8 to be the main audio track for a video
I have a video with 8 channels of audio.
I need tracks 7 (Left Stereo) and 8 (Right Stereo) to be the audio for the video (which I'm converting to flv).
I've tried playing with -filter_complex and the join, amix, and amerge filters, as well as the…
lo_fye
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votes
1 answer
FFMPEG live transcoder aac_latm audio crash
i am trying to use ffmpeg as a live transcoder to transcode tv channels from udp input to rtmp output to a wowza server.
i have 2 kinds of input channels in 1st kind the input audio is mp2 and in the second kind the input audio is acc_latm.
my…
0
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0 answers
Watch folder and transcode videos
I have a folder with multiple sub-folders, each of which contains multiple file formats like FLV, F4V, WMV, MOV, AVI, M4A, VOB & MPG .
I want to convert all files to MP4 format and save the converted video in the destination path by automatically…
user735647
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Transcoding with ffmpeg libfaac reduces the audio duration
I have to transcode a mpegts file: input.ts(H.264 and AAC)
So I use the following command line:
ffmpeg -y -i input.ts -acodec libfaac -vcodec copy out.ts
But I find that the duration of output.ts's audio is shorter than that of the input.ts!
If I…
sky609
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votes
1 answer
Maintain keyframes when transcoding and removing b-frames
I need to transcode a video from H.265 in a .mov container to H.264 in a .mkv container and would like to remove b-frames. The command to do that with ffmpeg is relatively straightforward [0], but it appears to be removing keyframes and using scene…
Dave Johansen
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1 answer
where I can get video encoding cookbook/ PDF/ tutorial
I need some reference (cookbook, PDF, tutorial or anything) for all about transcoding video things.
it will pleasure if anyone here can help me.
Thanks
Khalid
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