[FFmpeg-user] Ffmpeg fails to convert webm files when h264_nvenc forced

[oktay eşgül]

Hi Moritz,

Thank you for your comment.Yes ,seems webm encoding is not supportef by my
gpu.İnstead,I am planning toy use mkv as output container type.

With respect to combine below 4 steps as an one step for all operation,what
instruction do you recommend?

Thank you

On 28 Feb 2018 Wed at 11:59 Moritz Barsnick <barsnick at gmx.net> wrote:

> On Wed, Feb 28, 2018 at 05:53:17 +0000, oktay eşgül wrote:
> > Here is the main steps of my process:
> > 1.Split video and audio of the caller.
> > time ffmpeg -y -i 230087_caller.webm -vn -ab 256 230087_caller.wav
> > 2.Split video and audio of the callee
> > time ffmpeg -y -i 230087_callee.webm -vn -ab 256 230087_callee.wav
> > 3.Mux original caller video with callee audio to store the conversation.
> > time ffmpeg -y -i 230087_caller.webm -i 230087_callee.wav
> -filter_complex
> '[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a1];
> [1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=0.5[a2];
> [a1][a2]amerge,pan=stereo|c0<c0+c2|c1<c1+c3[out]' -map 0:v -map '[out]'
> -c:v copy -c:a libvorbis -shortest -f webm caller_temp.webm
> > 4.Add time fontfile to the caller_temp fil which fails with below error.
> > time ffmpeg -y -i caller_temp.webm -vf
> drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf:x=8:y=8:fontsize=16:fontcolor=yellow at 1:expansion=strftime:basetime=1518172680000000:text='%Y-%m-%d
> %H-%M-%S' -strict -2 -shortest -c:a libvorbis -c:v h264_nvenc
> final_font_test.webm
>
> I'm pretty sure this can all be done in one step, but that was not the
> aim of your email. ;-)
>
> > [webm @ 0x29e8540] Only VP8 or VP9 video and Vorbis or Opus audio and
> > WebVTT subtitles are supported for WebM.
> [...]
> > However,when I have changed the output file format to mp4/avi/mpeg GPU
> can
> > be used without any issue.Yet ,webm is important for us as the other
> > container file size becomes risky with storage perspective of view.
>
> Did you read this message? ffmpeg's webm muxer refuses to mux H.264
> video into WebM. You need to encode to vp9 or vp9. (I realize that
> there's no nvenc acceleration for that though, IIUC.)
>
> Moritz
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