I use the VAAPI HW ACCEL to transcode file to the FLV format that the command as follows.
ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_lax_profile_check -i infile.mkv -vf "format=nv12|vaapi,hwupload" -c:v h264_vaapi -c:a aac -ac 2 -ar 44100 *outfile1.flv* The transcoded file(outfile.flv) only can hear the audio but no video that played by the JW player. But when I transcode the file to the MKV and make the stream copy to the FLV format and this file can be played normally by the JW player. The command as follows. ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_lax_profile_check -i infile.mkv -vf "format=nv12|vaapi,hwupload" -c:v h264_vaapi -c:a aac -ac 2 -ar 44100 outfile.mkv ffmpeg -i outfile.mkv -c:v copy -c:a copy *outfile2.flv* I try to use the flv parser utility to find out the difference between the outfile1.flv and the outfile2.flv. Seems the Video Tag1 were different. the content as follows. outfile1.flv (transcode using the ffmpeg directly with VAAPI) 09 00 00 05 00 00 00 00 00 00 00 17 00 00 00 00 outfile2.flv(mke the stream copy from transcoded file) 09 00 00 30 00 00 00 00 00 00 00 17 00 00 00 00 01 6E 00 28 FF E1 00 1A 67 6E 00 28 A6 CD 94 07 80 22 7E 5C 04 40 00 00 FA 40 00 2E E0 03 C6 0C 65 80 01 00 06 68 EB E3 CB 22 C0 I not familiar with the video transcoding. I trace the flvenc.c seems the par->extradata_size would be 0 when use the VAAPI to transcode the file to the FLV directly, And it has some value which makes stream copy or use SW transcode ffmpeg -i infile.mkv -c:v libx264 -c:a aac -ac 2 -ar 44100 *outfile.flv (can be played normally by JW Player)* Is it a bug of the ffmpeg? Regards, Archer Chang _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
