Re: [FFmpeg-user] h264 and opus in mp4 container

[Moritz Barsnick]

On Mon, Feb 26, 2018 at 10:06:36 +0530, Vittalprasad wrote:
> external player like mplayer, vlc and kmp are failing to decode voice . i.e
> while playing mp4 file there is only video no voice.

Are you sure that your external players support this? This feature was
only recently added to the standard, and its support is only
experimental in ffmpeg. (That said, my mpv plays it fine.)

> Procedure followed using ffmpeg:
> 1. From sample mp4 file, i have separated audio(aac codec) and video(h264)
> in to different files .
> 2. aac trans-coded to opus
> 3. tried to merge video and audio(opus) in to single mp4

You can do all that in one step, if your ffmpeg supports the opus or
the libopus encoder(s).

> 1. whether ffmpeg support above codecs in single mp4 file or issue with
> external player .

ffmpeg does have support. It will give you an error that it is
experimental if you don't add "-strict experimental" as an output
option.

> If anyone has  mp4 file with h264 and opus codecs please provide me along
> with procedure to convert.

https://www.dropbox.com/s/422wukn3bt2x220/mp4_opus.mp4?dl=0

Assuming you have H.264 in your input file:
ffmpeg -i inputfile -c:v copy -c:a libopus -strict experimental outputfile.mp4

Moritz
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Re: [FFmpeg-user] h264 and opus in mp4 container

[Carl Eugen Hoyos]

2018-02-26 5:36 GMT+01:00 Vittalprasad :

> From below link i saw that mp4 container can have h264 as video codec and
> opus as audio codec. so i tried  both codecs in to mp4 using ffmpeg,

Command line and complete, uncut console output missing.

> but external player like mplayer, vlc and kmp are failing to decode voice

Why do you believe this is an issue with FFmpeg?

Carl Eugen
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Re: [FFmpeg-user] h264 and opus in mp4 container

[Adi Marvillo]

Hi Vittal, what you want do do is called multiplexing after you have 
demultiplexed/seperated your video- and audiotrack from a stream.
https://superuser.com/questions/429643/how-can-i-multiplex-a-video-and-audio-stream

ffmpeg can do demultiplexing-> conversion of audio track-> multiplexing A+V in 
one step with

ffmpeg -i INPUTFILE.mp4 -map 0:v -c:v libx264 -map 0:a -c:a libopus 
OUTPUTFILE.mp4

INPUTFILE means your original input.mp4 (sample.mp4). Be aware that you're 
loosing quality when converting your audio track from one format (aac) into the 
other lossy format (opus) if you're not planning to do something special 
with the opus-track, just leave it as it is with copy -map 0:a -c:a copy

regards adi



Am 2018-02-26 um 05:36 schrieb Vittalprasad:
>  Hi All,
> From below link i saw that mp4 container can have h264 as video codec and
> opus as audio codec. so i tried  both codecs in to mp4 using ffmpeg, but
> external player like mplayer, vlc and kmp are failing to decode voice . i.e
> while playing mp4 file there is only video no voice.
> https://en.wikipedia.org/wiki/Comparison_of_video_container_formats
>
> Procedure followed using ffmpeg:
> 1. From sample mp4 file, i have separated audio(aac codec) and video(h264)
> in to different files .
> 2. aac trans-coded to opus
> 3. tried to merge video and audio(opus) in to single mp4
>
>
> please let me know
> 1. whether ffmpeg support above codecs in single mp4 file or issue with
> external player .
>
> If anyone has  mp4 file with h264 and opus codecs please provide me along
> with procedure to convert.
>
>

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[FFmpeg-user] h264 and opus in mp4 container

[Vittalprasad]

 Hi All,
From below link i saw that mp4 container can have h264 as video codec and
opus as audio codec. so i tried  both codecs in to mp4 using ffmpeg, but
external player like mplayer, vlc and kmp are failing to decode voice . i.e
while playing mp4 file there is only video no voice.
https://en.wikipedia.org/wiki/Comparison_of_video_container_formats

Procedure followed using ffmpeg:
1. From sample mp4 file, i have separated audio(aac codec) and video(h264)
in to different files .
2. aac trans-coded to opus
3. tried to merge video and audio(opus) in to single mp4


please let me know
1. whether ffmpeg support above codecs in single mp4 file or issue with
external player .

If anyone has  mp4 file with h264 and opus codecs please provide me along
with procedure to convert.


-- 
Thanks & Regards
Vittal Prasad B R
902597
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