CODEWITHSUNDEEP
videoffmpegvideo-streamingh.264flv
Naseeb Panghal
Naseeb Panghal

Reputation: 159

H.264 - Green frames when streaming over TCP using FFmpeg

I am using FC23 machine and FFMPEG version is 2.8.10

Using below command, I can stream flv over tcp successfully and able to receive it successfully at receiver side as well. I play it using vlc player. Both audio and video are played well.

./ffmpeg -f x11grab -s 1920x1080 -framerate 15 -i :0.0 -f alsa -ac 2 -i hw:1 -vcodec libx264 -r 30 -pix_fmt yuv420p -tune zerolatency -preset ultrafast -acodec aac -strict -2 -ar 48000 -ab 96k -f flv -metadata streamName=naseeb.sdp tcp://127.0.0.1:6666

But in actually i need to do this using an application. So i wrote an application in 'C' language. I have done following things in the application.

 1. Open `AVOutputFormat` using below API
    fmt = av_guess_format("flv", NULL , NULL);
 2. Get `AVFormatContext` using below API
    avformat_alloc_output_context2(&oc, fmt, NULL, NULL);
 3. Then added streams(audio and video) using required APIs
 4. Then open codecs using required APIs
 5. Then set the output using below API
    ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);

(A) If I need to write flv into a file on system then I provide filename in step 5 as muxer.flv.

(B) If I need to stream flv over tcp then I provide filename as tcp://127.0.0.1:6666.

I have no doubt on Receiver side as it works very well with FFmpeg utility (command mentioned above). Currently I have downloaded ffmpeg 2.8.10 source code and looking into ffmpeg.c file for some extra setting. Till now I have not found anything helpful.

Please suggest something why Green frames shown when flv is sent on network where it works well when dump on system hard disk.

Upvotes: 2

Views: 1777

Answers (1)

Naseeb Panghal
Naseeb Panghal

Reputation: 159

I have solved the issue.

Earlier, i was calling avformat_write_header before extracting extradata which is required for flv container.

Now first i update st->codec->extradata and st->codec->extradata_size then i call avformat_write_header api and everything works fine.

Upvotes: 1

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