[FFmpeg-user] Identifying an MP4 file

Hi All, We have a HTTP Live Streaming (HLS) setup where we transcode incoming video files to H264 video and AAC audio and build playlist files from that. We want to avoid this step if the input file is already a MP4 file. I know that MP4 is just a container and does not imply H264 and AAC. I am

Re: [FFmpeg-user] How does FFmpeg + NVENC scale with multiple instances?

On 3/24/16, PSPunch wrote: > Hi, > > Trying to build a real-time transcoding farm based on FFmpeg + NVENC. > I see many bench marks report on encoding frame rate, but not sure on > how they scale when the number of encoding processes increase. > > I would appreciate advise from

Re: [FFmpeg-user] size and bitrate issues with nvidia accelerated transcoding

On 3/9/16, Andy Furniss <adf.li...@gmail.com> wrote: > Sreenath BH wrote: >> On 3/8/16, Moritz Barsnick <barsn...@gmx.net> wrote: > >>> If you want the same profiles and levels, you will need to request them >>> explicitly. >>> >>> The sa

[FFmpeg-user] Specifying a codec by name

Hi All, We have built ffmpeg with both nvidia codec and libx264. They both have the same codec ID of AV_CODEC_ID_H264, but have different names, nvenc_h264 and libx264. We want to use the same ffmpeg libraries to load either the nvidia or the libx264 codec in our program. However, the function

Re: [FFmpeg-user] size and bitrate issues with nvidia accelerated transcoding

On 3/8/16, Moritz Barsnick <barsn...@gmx.net> wrote: > Hi Sreenath, > > On Mon, Mar 07, 2016 at 22:28:32 +0530, Sreenath BH wrote: >> As can be seen the two outputs differ in the H264 profile(High vs >> Main), bitrate, the pixel format and of course the file sizes. >

Re: [FFmpeg-user] size and bitrate issues with nvidia accelerated transcoding

On 3/7/16, Carl Eugen Hoyos <ceho...@ag.or.at> wrote: > Sreenath BH gmail.com> writes: > >> Should I rerun the ffmprg command without the "loglevel quiet" >> and report the output? > > Yes, please. > >> Please suggest. The input file is r

Re: [FFmpeg-user] size and bitrate issues with nvidia accelerated transcoding

t; Carl Eugen Hoyos ag.or.at> writes: > >> Sreenath BH gmail.com> writes: >> >> > ffmpeg -i large.mp4 -loglevel quiet -c:a aac -c:v nvenc >> > -pix_fmt yuv420p -movflags +faststart out.mp4 >> >> Always provide the complete, uncut console output when >

Re: [FFmpeg-user] size and bitrate issues with nvidia accelerated transcoding

): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name: SoundHandler --- thanks, Sreenath On 3/7/16, Carl Eugen Hoyos <ceho...@ag.or.at> wrote: > Sreenath BH gmail.com> writes: > >> ffmpeg -i larg

[FFmpeg-user] size and bitrate issues with nvidia accelerated transcoding

Hi all, I am trying to use nvidia's nvenc codec to transcode video files. ffmpeg has been built with both libx264 and nvenc codecs enabled. ffmpeg when run using nvenc codec creates a file that is almost double the size of input mp4 file and bitrate almost double the size of input file. This is