On Thu, Feb 26, 2015 at 05:26:36PM +0000, Eng. Tweellt wrote: > Hello everyone, > > I'm trying to encode video and audio directly from a capture board, 1 video > stream and 8 single channel audio streams into a MXF file encoding it in > Mpeg-2. > > Everything is working fine except when I call av_write_trailer() at the end > (and before freeing CodecContext as stated in the documentation). > > After using av_write_trailer, I end up with the whole video looking like > this http://i.imgur.com/M6HkcpR.jpg . It seems like the decoder is > misplacing the b-frames in the wrong position, but If i don't call this > function I can play the media file, with the image as it should be, in VLC > but the timestamp is completely wrong. > Looking at mediainfo I can see that my file doesn't have the file duration > (which later made sense when I looked inside the code.) > > After a few hours with the file mxfenc.c found that if I comment the next > part inside the function mxf_write_footer(), the write trailer "kinda" > works, > > (...) > if (mxf->edit_unit_byte_count && s->oformat != &ff_mxf_opatom_muxer) { // > no need to repeat index > if ((err = mxf_write_partition(s, 0, 0, footer_partition_key, 0)) < > 0) > return err; > } /*else { > if ((err = mxf_write_partition(s, 0, 2, footer_partition_key, 0)) < > 0) > return err; > mxf_write_klv_fill(s); > mxf_write_index_table_segment(s); > }*/ > (...) > > The "kinda" works part, its because I can play the file correctly in VLC > with the correct timestamps, and if I open it with Mediainfo everything > looks good, but If I try to open it with Sorenson Squeeze (for example), I > get a warning saying "Squeeze does not support playing this file". > I carefully followed the documentation, samples, examples and I'm still > stuck :S. > I am using the ffmpeg 2.5.1 version and I also added a few changes that I > saw in the master, and nothing changed. > > Additional info: > > Target Output file format is a 1080i59.94, XDCam 30Mbit MXF op1a. > > Regarding the 8 audio streams the codec options have the one provided by > avcodec_get_context_defaults3 plus this changes: > > audio_codec_context->channels=1; > audio_codec_context->sample_rate = 48000; > audio_codec_context->bit_rate = 768000; > audio_codec_context->sample_fmt =AV_SAMPLE_FMT_S16; > audio_codec_context->flags= CODEC_FLAG_GLOBAL_HEADER; > audio_codec_context->time_base->num = 48000; > > > Regarding video I also do avcodec_get_context_defaults3 plus this: > > video_codec_context-> pix_fmt= AV_PIX_FMT_YUV422P; > video_codec_context->height = 1080; > video_codec_context->time_base->den = 30000; > video_codec_context->time_base->num = 1001; > video_codec_context->field_order= AVFieldOrder.AV_FIELD_TB; > video_codec_context->width = 1920; > video_codec_context->codec_id= AV_CODEC_ID_MPEG2VIDEO; > video_codec_context->has_b_frames= 1; > video_codec_context->max_b_frames = 2; > video_codec_context->gop_size= 12; > video_codec_context->global_quality= FF_QP2LAMBDA * 1; > video_codec_context->rc_initial_buffer_occupancy= 10695476; > video_codec_context->scenechange_threshold = 1000000000; > video_codec_context->color_primaries= AVCOL_PRI_BT709; > video_codec_context->color_trc= AVCOL_TRC_BT709; > video_codec_context->qmin= 1; > video_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER | > CODEC_FLAG_INTERLACED_DCT | CODEC_FLAG_INTERLACED_ME; > video_codec_context->bit_rate = 30000000; > video_codec_context->rc_min_rate= 30000000; > video_codec_context->rc_max_rate= 30000000; > video_codec_context->rc_buffer_size= 10695476; > > > I also had specified me_method and me_range, but nothing changed. > > Any idea what might be the problem?
can the problem be reproduced with command line FFmpeg ? [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB While the State exists there can be no freedom; when there is freedom there will be no State. -- Vladimir Lenin
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