[Libav-user] Configuring mp4 muxer to not recalculate time_base to an absurd timescale value

I encountered an unusual issue while upgrading from the ffmpeg 2.5 av libraries to 3.x (currently trying with 3.4.1) and am running into this on Windows using an msys2 mingw64 build from source. As I'm not sure exactly what would be helpful since it's not a command line issue, I'll just describe

Re: [Libav-user] Configuring mp4 muxer to not recalculate time_base to an absurd timescale value

> I set the time_base value in the output AVStream to 1/9, then stepped > through the code to write the header, some frames, and then the trailer. > Watching the time_base value in the debugger as I stepped through, I noticed > that the values change to the 1/15360 value after the

Re: [Libav-user] Configuring mp4 muxer to not recalculate time_base to an absurd timescale value

av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst); corey On Tue, Jan 9, 2018 at 2:50 PM, Corey Taylor <corey.taylor...@gmail.com> wrote: >> I set the time_base value in the output AVStream to 1/9, then stepped >> through the code to write the h

Re: [Libav-user] Configuring mp4 muxer to not recalculate time_base to an absurd timescale value

> > if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { > > >if (mov->video_track_timescale) { > track->timescale = mov->video_track_timescale; > } else { > track->timescale = st->time_base.den; >

Re: [Libav-user] Rotating video while transcoding

On Mon, Jan 15, 2018 at 4:51 PM, Davood Falahati wrote: > Dear all, > > I am using transcoding.c example. I want to know how should I rotate the > video by 90 degrees. The same thing that applies with > $ ffmpeg -i input_video -vf "transpose=1" output_video > in cli

Re: [Libav-user] How to get the last frame from a filter graph?

On Tue, Jan 23, 2018 at 2:04 AM, Tobias Rapp wrote: > Hi, > > in my application I have problems getting the last frame out of a filter > graph when the filter chain includes the yadif filter. The application is > based on the filtering_video.c example and I can reproduce

Re: [Libav-user] MUX Synchronize dts/pts/basetime does it mandatory?

On Tue, Jan 23, 2018 at 1:19 AM, kckang wrote: > //this code is not work > > dts = av_gettime() / 1000; > dts = dts * 25; > printf( "DTS:%l",dts); > dts = av_gettime(); > int duration = 20; // 20 > if(m_prevAudioDts > 0LL) { > duration = dts -

Re: [Libav-user] FFmpeg libraries and Nvidia NDEC licensing

On Wed, Jan 31, 2018 at 5:14 PM, wrote: > Hi, > > If I write an application that performs hardware decoding of H264 using > FFmpeg/FFmpeg libraries and the NVIDIA NDEC SDK, what license agreement > applies? > > For example, (as advised by https://developer.nvidia.com/ffmpeg),

Re: [Libav-user] Constant frame Rates and Chunk Durations

On Tue, Jan 30, 2018 at 1:20 PM, Allan Rosner wrote: > Hi, > > What ffmpeg API calls do I need to make to ensure constant chunk duration, > video frame rate, audio frame rate and key frame distance for each video > chunk. > I would start by reading the encode_video.c and

Re: [Libav-user] some differences between ffmpeg-3.3.3 and ffmpeg-3.4

On Wed, Feb 7, 2018 at 3:55 AM, Liyong (R) wrote: > Dear libav-users > > > > When I used “avcodec_decode_video2” for real time Mpeg2 > decoding(one-stream-in-one-frame-out), I found different behaviors > between version 3.4 and version 3.3.3. > > > > When I used

Re: [Libav-user] Loading an image with AVFrame

On Mon, Feb 19, 2018 at 8:58 AM, Pedro Pereira <1995pedropere...@gmail.com> wrote: > However I am only interested in loading an image (or a frame of a video) > and apply the scaling operation. > I searched for a way to load an image to an AVFrame, apply the sws_scale > and then write the

Re: [Libav-user] Change libx264 profile

On Tue, Feb 20, 2018 at 6:48 AM, Valeriy Shtoma wrote: > Hi to all, > > Tell me, please, how to change libx264 profile and level? I tried: > > av_dict_set(, "profile", "high", 0); > av_dict_set(, "level", "41", 0); This looks like the correct option for libx264

Re: [Libav-user] SIde data allocate space

What error do you see? corey On Thu, Jan 11, 2018 at 2:02 PM, Davood Falahati wrote: > Dear all, > > I read this description in avformat.h > > /** > > * Wrap an existing array as stream side data. > > * > > * @param st stream > > * @param type side information

Re: [Libav-user] MUX Synchronize dts/pts/basetime does it mandatory?

On Mon, Jan 22, 2018 at 7:17 PM, kckang wrote: > mux works 2 stream combine, audio is 1, video is 0 stream. > when combine two type of packet, just ignore and write to output context. but > its makes half size. > fralkly, I was so much confused, coz I wanna it becomes