[Libav-user] Streaming YUV file in PIX_FMT_RGBA format to VLC player

[Hema A]

To add on, currently the image that is streamed in PIX_FMT_RGBA format is
not clear. It has green strips and we can observe the frames very faintly in
the background.
Thanks,
Hema
On Thu, Oct 27, 2011 at 5:20 PM, Hema A <hema.angamuthu at gmail.com> wrote:

> Hi,
>
> I am trying to stream a YUV file whose pix format is PIX_FMT_RGBA
> , to a VLC player. I use H264 codec for encoding using FFMPEG. Earlier i
> had used YUV file with PIX_FMT_YUV420P format and i could successfully
> stream the YUV video with the same source implementation. Can anybody let me
> know if the below code needs any additional change for encoding a YUV file
> in RGBA format and does VLC player support playing such files?
>
> I have specified the following in the code;
>
> //Allocate codec context
>
> codec = avcodec_find_encoder(CODEC_ID_
> H264);
>
> c = mpegtsstream->codec;
>
> //c->profile= FF_PROFILE_H264_BASELINE;
>
> c
> ->coder_type=FF_CODER_TYPE_VLC;
>
> c->bit_rate = 400000;
>
> c->width =
> 480
>
> c->height =
> 800
>
> c->time_base= (AVRational){1,10}; //frames per second
>
> c->gop_size = 250; /* emit one intra frame every 250 frames */
>
> c
> ->max_b_frames=0;
>
> c->pix_fmt = PIX_FMT_
> RGBA;
>
> c->me_range = 16;
>
> c->max_qdiff = 4;
>
> c
> ->qmin = 10;
>
> c->qmax = 35;
>
> c->qcompress = 0.3;
>
> a
> vcodec_open(c, codec);
> Created
> AVFrame, filled the raw data from the YUV file into AVPicture...
>
> frame = avcodec_alloc_frame();
>
> n
> umBytes = avpicture_get_size(PIX_FMT_RGBA, c->width, c->height);
> buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
> .
> ..
> ...
>
> for(;;)
> {
>
> sizein = fread(buffer, 1, numBytes, f);
>
> ...
>
> ...
>
> avpicture_fill((AVPicture*)frame, buffer, PIX_FMT_
> RGBA, c->width, c->height);
>
> frame->interlaced_frame = 1; //if wanted and in video parameters defined
>
> frame->top_field_first = 1;
>
> fd->framebuf_size = avcodec_encode_video(c, fd->frame_buffer, numBytes,
> frame);
>
> The encoded buffer will be encapsulted with Mpeg-ts and RTP protocol, and
> streamed to the VLC player. I have used
> av_interleaved_write_frame() for writing the frames into Mpeg-ts and RTP
> context.
> Thanks in advance,
> Hema
>
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