Hi, I'm trying to record MPEG-DASH live streams using FFmpeg 4.0.2, e.g.
./ffmpeg.exe -v 40 -i http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestBR.mpd -c:a copy test.aac The first few fragments are recorded correctly, but then I only get HTTP 404 responses: [dash @ 000000000070cc40] Parsing 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestBR.mpd' - skipp not supported representation type [...] [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-init.mp4', offset 0, playlist 0 [dash @ 000000000070cc40] Could not read complete fragment. [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-133781.mp4', offset 0, playlist 0 [...] Input #0, dash, from 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/manifestBR.mpd': Duration: N/A, start: 267558.240000, bitrate: N/A Program 0 Stream #0:0: Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt709, left), 1280x720 [SAR 1:1 DAR 16:9], 0 kb/s, 25 fps, 25 tbr, 10000k tbn, 50 tbc Metadata: variant_bitrate : 2000000 id : video_00 Stream #0:1: Video: h264 (Main), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg, left), 960x540 (960x544) [SAR 1:1 DAR 16:9], 0 kb/s, 25 fps, 25 tbr, 10000k tbn, 20000k tbc Metadata: variant_bitrate : 1800000 id : video_01 Stream #0:2: Video: h264 (Main), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg, left), 640x360 (640x368) [SAR 1:1 DAR 16:9], 0 kb/s, 25 fps, 25 tbr, 10000k tbn, 20000k tbc Metadata: variant_bitrate : 1024000 id : video_02 Stream #0:3: Video: h264 (Main), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg, left), 512x288 [SAR 1:1 DAR 16:9], 0 kb/s, 25 fps, 25 tbr, 10000k tbn, 20000k tbc Metadata: variant_bitrate : 512000 id : video_03 Stream #0:4: Video: h264 (Constrained Baseline), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg, left), 480x270 (480x272) [SAR 1:1 DAR 16:9], 0 kb/s, 25 fps, 25 tbr, 10000k tbn, 50 tbc Metadata: variant_bitrate : 256000 id : video_04 Stream #0:5: Video: h264 (Constrained Baseline), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg, left), 320x180 (320x192) [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 10000k tbn, 50 tbc Metadata: variant_bitrate : 128000 id : video_05 Stream #0:6: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 0 kb/s Metadata: variant_bitrate : 192000 id : audio_06 Output #0, adts, to 'test.aac': Metadata: encoder : Lavf58.12.100 Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 0 kb/s Metadata: variant_bitrate : 192000 id : audio_06 Stream mapping: Stream #0:6 -> #0:0 (copy) Press [q] to stop, [?] for help [dash @ 000000000070cc40] No longer receiving stream_index 0 [dash @ 000000000070cc40] No longer receiving stream_index 1 [dash @ 000000000070cc40] No longer receiving stream_index 2 [dash @ 000000000070cc40] No longer receiving stream_index 3 [dash @ 000000000070cc40] No longer receiving stream_index 4 [dash @ 000000000070cc40] No longer receiving stream_index 5 [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-133782.mp4', offset 0, playlist 0 [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-133783.mp4', offset 0, playlist 0 [dash @ 000000000070cc40] new fragment: min[133758] max[133783], playlist 0 [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-133784.mp4', offset 0, playlist 0 [http @ 0000000000792d40] HTTP error 404 Not Found [dash @ 000000000070cc40] Failed to open fragment of playlist 0 [dash @ 000000000070cc40] new fragment: min[133758] max[133783], playlist 0 [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-133785.mp4', offset 0, playlist 0 [http @ 0000000000792d40] HTTP error 404 Not Found [dash @ 000000000070cc40] Failed to open fragment of playlist 0 [dash @ 000000000070cc40] new fragment: min[133758] max[133783], playlist 0 [dash @ 000000000070cc40] DASH request for url 'http://irtdashreference-i.akamaihd.net/dash/live/901161/bfs/83c5debb3328a0e08b8c102b6d5ce378_1_audio_06-133786.mp4', offset 0, playlist 0 [...] I used wireshark to compare what's happening when using FFmpeg and when using the HTML demo player at http://subtitling.irt.de/ FFmpeg tries to read the stream as fast as possible resulting in requests for fragments not yet available, while the player requests the next fragment after 2 seconds. FFmpeg does not retry to read the fragments. It just increases the fragment number and tries the next one again and again. Is there something I'm doing wrong or is this a bug in FFmpeg? I already looked into the current sources. The code for MPEG-DASH does not seem to have changed since 4.0.2. Kind regards, Jörg _______________________________________________ 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".
